1. A refrigerant cycle comprising:
a compressor for compressing a refrigerant, and delivering the refrigerant to a condenser, a main expansion device downstream of said condenser, and an evaporator downstream of said main expansion device;
an economizer heat exchanger for receiving a main refrigerant flow, and a tapped refrigerant flow, said tapped refrigerant flow passing through an economizer expansion device, and said tapped refrigerant flow cooling said main refrigerant flow in said economizer heat exchanger;
a reheat coil for receiving at least a portion of a refrigerant flow at a temperature above a temperature of the refrigerant reaching said evaporator, said reheat coil being positioned downstream of said economizer heat exchanger; and
an air moving device for driving air over said evaporator and said reheat coil, such that air may be cooled and dehumidified by passing over said evaporator and then be reheated by said reheat coil.
2. The refrigerant cycle as set forth in claim 1, wherein said economizer heat exchanger is positioned downstream of said condenser.
3. The refrigerant cycle as set forth in claim 1, wherein a flow control device is positioned downstream of said economizer heat exchanger and selectively communicates at least a portion of a refrigerant to said reheat coil.
4. The refrigerant cycle as set forth in claim 1, wherein said tapped refrigerant in said economizer heat exchanger is tapped downstream of said condenser and upstream of said economizer heat exchanger.
5. The refrigerant cycle as set forth in claim 1, wherein said tapped refrigerant in said economizer heat exchanger is tapped downstream of said reheat coil and upstream of said main expansion device.
6. The refrigerant cycle as set forth in claim 1, wherein said tapped refrigerant in said economizer heat exchanger is tapped downstream of said economizer heat exchanger and upstream of said reheat coil.
7. A refrigerant cycle comprising:
a compressor for compressing a refrigerant, and delivering the refrigerant to a condenser, a main expansion device downstream of said condenser, and an evaporator downstream of said main expansion device;
an economizer heat exchanger for receiving a main refrigerant flow, and a tapped refrigerant flow, said tapped refrigerant flow passing through an economizer expansion device, and said tapped refrigerant flow cooling said main refrigerant flow in said economizer heat exchanger;
a reheat coil for receiving at least a portion of a refrigerant flow at a temperature above a temperature of the refrigerant reaching said evaporator;
an air moving device for driving air over said evaporator and said reheat coil, such that air may be cooled and dehumidified by passing over said evaporator and then be reheated by said reheat coil; and
said reheat coil including a flow control device for communicating refrigerant to said reheat coil, said flow control device being located upstream of said economizer heat exchanger, and said reheat coil returning refrigerant to said main refrigerant flow at a return point, said tapped refrigerant flow being upstream of said return point.
8. The refrigerant cycle as set forth in claim 7, wherein said tapped refrigerant for said economizer heat exchanger is tapped at a location downstream of said condenser, and upstream of said economizer heat exchanger.
9. The refrigerant cycle as set forth in claim 7, wherein said tapped flow for said economizer heat exchanger is tapped from a location upstream of said flow control device.
10. A refrigerant cycle comprising:
a compressor for compressing a refrigerant, and delivering the refrigerant to a condenser, a main expansion device downstream of said condenser, and an evaporator downstream of said main expansion device;
an economizer heat exchanger for receiving a main refrigerant flow, and a tapped refrigerant flow, said tapped refrigerant flow passing through an economizer expansion device, and said tapped refrigerant flow cooling said main refrigerant flow in said economizer heat exchanger;
a reheat coil for receiving at least a portion of a refrigerant flow at a temperature above a temperature of the refrigerant reaching said evaporator, said reheat coil positioned upstream of said condenser; and
an air moving device for driving air over said evaporator and said reheat coil, such that air may be cooled and dehumidified by passing over said evaporator and then be reheated by said reheat coil.
11. The refrigerant cycle as set forth in claim 10, wherein said economizer heat exchanger is positioned downstream of said condenser.
12. The refrigerant cycle as set forth in claim 10, wherein refrigerant downstream of said reheat coil is returned to a main flow line upstream of said condenser.
13. The refrigerant cycle as set forth in claim 10, wherein said tapped refrigerant flow is tapped downstream of said economizer heat exchanger.
14. The refrigerant cycle as set forth in claim 10, wherein said tapped refrigerant flow is tapped upstream of said economizer heat exchanger.
15. A refrigerant cycle comprising:
a compressor for compressing a refrigerant, and delivering the refrigerant to a condenser, a main expansion device downstream of said condenser, and an evaporator downstream of said main expansion device;
an economizer heat exchanger for receiving a main refrigerant flow, and a tapped refrigerant flow, said tapped refrigerant flow passing through an economizer expansion device, and said tapped refrigerant flow cooling said main refrigerant flow in said economizer heat exchanger;
a reheat coil for receiving at least a portion of a refrigerant flow at a temperature above a temperature of the refrigerant reaching said evaporator; and
an air moving device for driving air over said evaporator and said reheat coil, such that air may be cooled and dehumidified by passing over said evaporator and then be reheated by said reheat coil; and
wherein refrigerant is passed through said condenser andor through serially connected said reheat coil and said economizer heat exchanger.
16. The refrigerant cycle as set forth in claim 15, wherein said refrigerant is serially passed through said economizer heat exchanger, and then through said reheat coil.
17. The refrigerant cycle as set forth in claim 15, wherein said tapped refrigerant for said economizer heat exchanger is tapped downstream of said economizer heat exchanger and upstream of said reheat coil.
18. The refrigerant cycle as set forth in claim 15, wherein said tapped refrigerant for said economizer heat exchanger is tapped downstream of said reheat coil.
19. The refrigerant cycle as set forth in claim 15, wherein said refrigerant is serially passed through said reheat coil, and then through economizer heat exchanger.
20. The refrigerant cycle as set forth in claim 19, wherein said tapped refrigerant for said economizer heat exchanger is tapped downstream of said reheat coil and upstream of said economizer heat exchanger.
21. The refrigerant cycle as set forth in claim 19, wherein said tapped refrigerant for said economizer heat exchanger is tapped downstream of said economizer heat exchanger.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A motor control device comprising:
a velocity calculation unit that calculates an actual velocity from a detected position that is a position of a motor or of a load connected to the motor, the detected position being detected by a detector;
a velocity control unit that performs velocity control to cause the actual velocity to follow a velocity command and outputs a q-axis current command;
a uvwdq coordinate converting unit that receives a three-phase current detected in an inverter, performs coordinate conversion from a uvw three-phase coordinate system at rest into a dq synchronous rotation coordinate system, and outputs a d-axis current detection value and a q-axis current detection value;
a current control unit that receives a d-axis current command, the q-axis current command, the d-axis current detection value, and the q-axis current detection value, performs current control so that a dq-axis current detection value coincides with a dq-axis current command, and outputs a d-axis voltage command and a q-axis voltage command;
a dquvw coordinate converting unit that receives the d-axis voltage command, the q-axis voltage command, and the detected position, performs coordinate conversion from the dq synchronous rotation coordinate system into the uvw three-phase coordinate system at rest, and outputs a three-phase voltage command;
an inverter that receives the three-phase voltage command, applies an actual three-phase voltage to the motor, and drives the motor at a variable velocity;
a superimposed signal generating unit that outputs a superimposed signal of a repetitive waveform, such as a triangular wave or a sine wave;
a d-axis current command generating unit that adds the superimposed signal generated by the superimposed signal generating unit to a d-axis current command nominal value and outputs the d-axis current command; and
an axial misalignment detecting unit that receives the d-axis current command and the q-axis current command output from the velocity control unit and outputs an axial misalignment angle estimation value.
2. The motor control device according to claim 1, further comprising a position control unit that receives a position command and the detected position detected by the detector, performs position control to cause the detected position to follow the position command, and outputs a velocity command to the velocity control unit,
wherein the superimposed signal generating unit outputs the superimposed signal of the repetitive waveform, such as a triangular wave or a sine wave.
3. A motor control device comprising:
a velocity calculation unit that calculates an actual velocity from a detected position that is a position of a motor or of a load connected to the motor, the detected position being detected by a detector;
a uvwdq coordinate converting unit that receives a three-phase current detected in an inverter, performs coordinate conversion from a uvw three-phase coordinate system at rest into a dq synchronous rotation coordinate system, and outputs a d-axis current detection value and a q-axis current detection value;
a current control unit that receives a d-axis current command, a q-axis current command, the d-axis current detection value, and the q-axis current detection value, performs current control so that a dq-axis current detection value coincides with a dq-axis current command, and outputs a d-axis voltage command and a q-axis voltage command;
a dquvw coordinate converting unit that receives the d-axis voltage command, the q-axis voltage command, and the detected position, performs coordinate conversion from the dq synchronous rotation coordinate system into the uvw three-phase coordinate system at rest, and outputs a three-phase voltage command;
an inverter that receives the three-phase voltage command, applies an actual three-phase voltage to the motor, and drives the motor at a variable velocity;
a superimposed signal generating unit that outputs a superimposed signal of a repetitive waveform, such as a triangular wave or a sine wave;
a d-axis current command generating unit that adds the superimposed signal generated by the superimposed signal generating unit to a d-axis current command nominal value and outputs the d-axis current command;
a torque current error calculation unit that receives the actual velocity output from the velocity calculation unit and the q-axis current command, and estimates a torque current error actually occurring in the motor; and
an axial misalignment detecting unit that receives the d-axis current command and the torque current error, and outputs an axial misalignment angle estimation value.
4. The motor control device according to claim 3, further comprising a velocity control unit that performs velocity control to cause the actual velocity to follow a velocity command, and outputs the q-axis current command,
wherein the superimposed signal generating unit outputs the superimposed signal of the repetitive waveform, such as a triangular wave or a sine wave.
5. The motor control device according to claim 1, further comprising an axial misalignment correction unit that receives the axial misalignment angle estimation value output from the axial misalignment detecting unit and the detected position detected by the detector, calculates a position after correction, and outputs the calculated position to the dquvw coordinate converting unit and the uvwdq coordinate converting unit,
wherein the dquvw coordinate converting unit and the uvwdq coordinate converting unit perform the coordinate conversion on the basis of the position after correction.
6. The motor control device according to claim 5, wherein the axial misalignment detecting unit includes:
a first input filter that filters the d-axis current command and outputs a d-axis signal for axial misalignment detection,
a second input filter that filters the q-axis current command or torque current error and outputs a q-axis signal for axial misalignment detection,
an adaptive input calculation unit that calculates an adaptive input by multiplying the d-axis signal for axial misalignment detection by the q-axis signal for axial misalignment detection,
a gain unit that multiplies the adaptive input by a gain and generates an integral input, and
an integrator that integrates the integral input and outputs the axial misalignment angle estimation value.
7. The motor control device according to claim 5, wherein the axial misalignment detecting unit includes:
a first input filter that filters the d-axis current command and outputs a d-axis signal for axial misalignment detection,
a variable gain calculation unit that calculates a function of the d-axis signal for axial misalignment detection,
a second input filter that filters the q-axis current command or torque current error and outputs a q-axis signal for axial misalignment detection,
an adaptive input calculation unit that calculates an adaptive input by multiplying the function of the d-axis signal for axial misalignment detection and the q-axis signal for axial misalignment detection, and
an integrator that integrates the integral input and outputs the axial misalignment angle estimation value.
8. The motor control device according to claim 5, wherein the axial misalignment detecting unit includes:
a first input filter that filters the d-axis current command and outputs a d-axis signal for axial misalignment detection,
a first sign detector that detects a sign of the d-axis signal for axial misalignment detection and outputs a sign-added d-axis signal for axial misalignment detection,
a second input filter that filters the q-axis current command or torque current error and outputs a q-axis signal for axial misalignment detection,
a second sign detector that detects a sign of the q-axis signal for axial misalignment detection and outputs a sign-added q-axis signal for axial misalignment detection,
an adaptive input calculation unit that calculates a sign-added adaptive input by multiplying the sign-added d-axis signal for axial misalignment detection by the sign-added q-axis signal for axial misalignment detection,
a gain unit that multiplies the sign-added adaptive input by a gain and generates an integral input, and
an integrator that integrates the integral input and outputs the axial misalignment angle estimation value.
9. The motor control device according to claim 5, wherein the axial misalignment detecting unit includes:
a first input filter that filters the d-axis current command and outputs a d-axis signal for axial misalignment detection,
a second input filter that filters the q-axis current command or torque current error and outputs a q-axis signal for axial misalignment detection,
an estimation output calculation unit that multiplies the d-axis signal for axial misalignment detection filtered by the input filter by the axial misalignment angle estimation value to be described below, and outputs an estimation output,
an axial misalignment error calculation unit that finds a difference between the q-axis signal for axial misalignment detection filtered by the second input filter and the estimation output from the estimation output calculation unit and outputs an axial misalignment error,
a variable gain unit that multiplies the axial misalignment error output from the axial misalignment error calculation unit by a gain and outputs an integral input, and
an integrator that integrates the integral input output from the variable gain unit to obtain the axial misalignment angle estimation value.
10. A motor control device comprising:
a velocity calculation unit that calculates an actual velocity from a detected position that is a position of a motor or of a load connected to the motor, the detected position being detected by a detector;
a uvwdq coordinate converting unit that receives a three-phase current detected in an inverter, performs coordinate conversion from a uvw three-phase coordinate system at rest into a dq synchronous rotation coordinate system, and outputs a d-axis current detection value and a q-axis current detection value;
a current control unit that receives a d-axis current command, a q-axis current command, the d-axis current detection value, and the q-axis current detection value, performs current control such that a dq-axis current detection value coincides with a dq-axis current command, and outputs a d-axis voltage command and a q-axis voltage command;
a dquvw coordinate converting unit that receives the d-axis voltage command, the q-axis voltage command, and the detected position, performs coordinate conversion from the dq synchronous rotation coordinate system into the uvw three-phase coordinate system at rest, and outputs a three-phase voltage command;
an inverter that receives the three-phase voltage command, applies an actual three-phase voltage to the motor, and drives the motor at a variable velocity;
a superimposed signal generating unit that sets the q-axis current command to zero and outputs a superimposed signal of a repetitive waveform, such as a triangular wave or a sine wave;
a d-axis current command generating unit that adds the superimposed signal generated by the superimposed signal generating unit to the d-axis current command and outputs the d-axis current command;
an axial misalignment detecting unit that receives the d-axis current command and the q-axis current command and outputs an axial misalignment angle estimation value;
a display unit that displays the axial misalignment angle estimation value;
a memory that stores the axial misalignment angle estimation value; and
an axial misalignment correction unit that receives the axial misalignment angle estimation value stored in the memory and the detected position, and outputs a position after correction.
11. The motor control device according to claim 3, further comprising an axial misalignment correction unit that receives the axial misalignment angle estimation value output from the axial misalignment detecting unit and the detected position detected by the detector, calculates a position after correction, and outputs the calculated position to the dquvw coordinate converting unit and the uvwdq coordinate converting unit,
wherein the dquvw coordinate converting unit and the uvwdq coordinate converting unit perform the coordinate conversion on the basis of the position after correction.
12. The motor control device according to claim 11, wherein the axial misalignment detecting unit includes:
a first input filter that filters the d-axis current command and outputs a d-axis signal for axial misalignment detection,
a second input filter that filters the q-axis current command or torque current error and outputs a q-axis signal for axial misalignment detection,
an adaptive input calculation unit that calculates an adaptive input by multiplying the d-axis signal for axial misalignment detection by the q-axis signal for axial misalignment detection,
a gain unit that multiplies the adaptive input by a gain and generates an integral input, and
an integrator that integrates the integral input and outputs the axial misalignment angle estimation value.
13. The motor control device according to claim 11, wherein the axial misalignment detecting unit includes:
a first input filter that filters the d-axis current command and outputs a d-axis signal for axial misalignment detection,
a variable gain calculation unit that calculates a function of the d-axis signal for axial misalignment detection,
a second input filter that filters the q-axis current command or torque current error and outputs a q-axis signal for axial misalignment detection,
an adaptive input calculation unit that calculates an adaptive input by multiplying the function of the d-axis signal for axial misalignment detection and the q-axis signal for axial misalignment detection, and
an integrator that integrates the integral input and outputs the axial misalignment angle estimation value.
14. The motor control device according to claim 11, wherein the axial misalignment detecting unit includes:
a first input filter that filters the d-axis current command and outputs a d-axis signal for axial misalignment detection,
a first sign detector that detects a sign of the d-axis signal for axial misalignment detection and outputs a sign-added d-axis signal for axial misalignment detection,
a second input filter that filters the q-axis current command or torque current error and outputs a q-axis signal for axial misalignment detection,
a second sign detector that detects a sign of the q-axis signal for axial misalignment detection and outputs a sign-added q-axis signal for axial misalignment detection,
an adaptive input calculation unit that calculates a sign-added adaptive input by multiplying the sign-added d-axis signal for axial misalignment detection by the sign-added q-axis signal for axial misalignment detection,
a gain unit that multiplies the sign-added adaptive input by a gain and generates an integral input, and
an integrator that integrates the integral input and outputs the axial misalignment angle estimation value.
15. The motor control device according to claim 11, wherein the axial misalignment detecting unit includes:
a first input filter that filters the d-axis current command and outputs a d-axis signal for axial misalignment detection,
a second input filter that filters the q-axis current command or torque current error and outputs a q-axis signal for axial misalignment detection,
an estimation output calculation unit that multiplies the d-axis signal for axial misalignment detection filtered by the input filter by the axial misalignment angle estimation value to be described below, and outputs an estimation output,
an axial misalignment error calculation unit that finds a difference between the q-axis signal for axial misalignment detection filtered by the second input filter and the estimation output from the estimation output calculation unit and outputs an axial misalignment error,
a variable gain unit that multiplies the axial misalignment error output from the axial misalignment error calculation unit by a gain and outputs an integral input, and
an integrator that integrates the integral input output from the variable gain unit to obtain the axial misalignment angle estimation value.
16. The motor control device according to claim 1, wherein the axial misalignment detecting unit includes:
a first input filter that filters the d-axis current command and outputs a d-axis signal for axial misalignment detection,
a second input filter that filters the q-axis current command or torque current error and outputs a d-axis signal for axial misalignment detection,
an estimation output calculation unit that multiplies the d-axis signal for axial misalignment detection filtered by the input filter by the axial misalignment angle estimation value to be described below, and outputs an estimation output,
an axial misalignment error calculation unit that finds a difference between the q-axis signal for axial misalignment detection filtered by the second input filter and the estimation output from the estimation output calculation unit and Outputs an axial misalignment error,
a variable gain unit that multiplies the axial misalignment error output from the axial misalignment error calculation unit by a gain and outputs an integral input, and
an integrator that integrates the integral input output from the variable gain unit to obtain the axial misalignment angle estimation value.
17. The motor control device according to claim 3, wherein the axial misalignment detecting unit includes:
a first input filter that filters the d-axis current command and outputs a d-axis signal for axial misalignment detection,
a second input filter that filters the q-axis current command or torque current error and outputs a q-axis signal for axial misalignment detection,
an estimation output calculation unit that multiplies the d-axis signal for axial misalignment detection filtered by the input filter by the axial misalignment angle estimation value to be described below, and outputs an estimation output,
an axial misalignment error calculation unit that finds a difference between the q-axis signal for axial misalignment detection filtered by the second input filter and the estimation output from the estimation output calculation unit and outputs an axial misalignment error,
a variable gain unit that multiplies the axial misalignment error output from the axial misalignment error calculation unit by a gain and outputs an integral input, and
an integrator that integrates the integral input output from the variable gain unit to obtain the axial misalignment angle estimation value.