1. An angle sensor, comprising:
a reduction mechanism that reduces a rotation transmitted from a rotation axis;
a variable inductance mechanism that changes an inductance according to a rotation angle of a reduced axis of said reduction mechanism;
a detection coil that detects the change of inductance; and
a circuit that detects the angle of said rotation axis from the output of said detection coil.
2. The angle sensor according to claim 1, wherein:
the change of inductance in said variable inductance mechanism is maximum near a rotation angle of zero in the reduced axis.
3. The angle sensor according to claim 1, wherein:
said reduction mechanism is a planetary gear unit including a sun gear, a planet gear and a ring gear.
4. The angle sensor according to claim 1, wherein:
said reduction mechanism has a reduction ratio of 14 to 110.
5. An angle-torque sensor, comprising:
a torque detection coil that detects a change in state quantity in a mechanism to detect a relative angle made between input axis and output axis of a torsion bar to be twisted by a torque;
an angle detection coil that detects a change in state quantity in a mechanism to detect a rotation angle of a reduction axis which rotates with a rotation being transmitted from said input axis or output axis and being reduced by a reduction mechanism;
a torque detection circuit that detects the relative angle from the output of said torque detection coil; and
an angle detection circuit that detects the rotation angle from the output of said angle detection coil.
6. The angle-torque sensor according to claim 5, wherein:
said reduction mechanism is a planetary gear unit including a sun gear, a planet gear and a ring gear.
7. The angle-torque sensor according to claim 5, wherein:
said reduction mechanism has a reduction ratio of 14 to 110.
8. The angle-torque sensor according to claim 5, wherein:
said torque detection coil and said angle detection coil have the same shape.
9. The angle-torque sensor according to claim 5, wherein:
said torque detection coil includes first and second detection coils,
said angle detection coil includes third and fourth detection coils,
said torque detection circuit detects the torque by detecting the relative angle from a difference between the outputs of said first and second detection coils,
said angle detection circuit detects the rotation angle from a difference between the outputs of said third and fourth detection coils, and
said first to fourth detection coils are disposed on the same axis.
10. The angle-torque sensor according to claim 5, further comprising:
a compensation means for compensating one or both of the output of said torque detection coil and the output of said angle detection coil.
11. The angle-torque sensor according to claim 10, wherein:
said torque detection coil includes first and second detection coils,
said torque detection circuit detects the torque from a difference between the outputs of said first and second detection coils, and
said compensation means is a compensation circuit that generates a compensation signal from an average of the outputs of said first and second detection coils to compensate the output of said angle detection coil.
12. The angle-torque sensor according to claim 11, wherein:
said first and second detection coils detect a change in inductance that changes according to a relative angle between a detection ring disposed on said input axis and a detection ring disposed on said output axis, and
said angle detection coil detects a change in inductance that changes according to a relative angle between a reduction axis detection ring being disposed on said reduction axis and a fixed ring.
13. The angle-torque sensor according to claim 10, wherein:
said compensation means includes a compensation coil that detects a state quantity determined by a mechanism which gives a compensation signal to compensate the output of said torque detection coil and said angle detection coil, and a compensation circuit that generates the compensating signal from the output of said compensation coil.
14. The angle-torque sensor according to claim 13, wherein:
said torque detection coil detects a change in inductance that changes according to a relative angle between a detection ring disposed on said input axis and a detection ring disposed on said output axis,
said compensation coil detects an inductance determined by a compensating ring being fixed and the detection ring of said input axis or said output axis, and
said angle detection coil detects a change in inductance that changes according to a relative angle between a reduction axis detection ring being disposed on said reduction axis and said compensation ring.
15. The angle-torque sensor according to claim 13, wherein:
said torque detection coil detects a change in inductance that changes according to a relative angle between a detection ring disposed on said input axis and a detection ring disposed on said output axis,
said compensation coil detects an inductance determined by a compensating ring, and
said angle detection coil detects a change in inductance that changes according to a relative angle between a reduction axis detection ring being disposed on said reduction axis and a fixed ring.
16. An electric power steering unit, comprising:
a motor that drives a steering rotation axis;
a steering sensor that includes: a torque detection coil that is disposed on said rotation axis and detects a change in state quantity in a mechanism to detect a steering angle from a relative angle made between input axis and output axis of a torsion bar to be twisted by the steering torque; an
angle detection coil that detects a change in state quantity in a mechanism to detect a steering angle from a rotation being transmitted from said input axis or output axis and being reduced by a reduction mechanism; a torque detection circuit that detects the steering torque by detecting the relative angle from the output of said torque detection coil; and an angle detection circuit that detects the steering angle from the output of said angle detection coil; and
a controller that controls said motor based on the steering torque and steering angle to be detected by said steering sensor.
17. The electric power steering unit according to claim 16, wherein:
said torque detection coil includes first and second detection coils,
said angle detection coil includes third and fourth detection coils,
said torque detection circuit detects the steering torque by detecting the relative angle from a difference between the outputs of said first and second detection coils,
said angle detection circuit detects the steering angle from a difference between the outputs of said third and fourth detection coils, and
said first to fourth detection coils are disposed on the same axis.
18. The electric power steering unit according to claim 16, wherein:
said steering sensor further includes a compensation means that compensates one or both of the output of said torque detection coil and the output of said angle detection coil.
19. The electric power steering unit according to claim 18, wherein:
said compensation means includes a compensation coil that detects a state quantity determined by a mechanism which gives a compensation signal to compensate the output of said torque detection coil and said angle detection coil, and a compensation circuit that generates the compensating signal from the output of said compensation coil, and
said controller controls said motor based on the steering torque and steering angle to be corrected by said compensation means.
20. The electric power steering unit according to claim 18, wherein:
said torque detection coil includes first and second detection coils,
said torque detection circuit detects the steering torque from a difference between the outputs of said first and second detection coils,
said compensation means is a compensation circuit that generates a compensation signal from an average of the outputs of said first and second detection coils to compensate the output of said angle detection coil, and
said controller controls said motor based on the steering torque and the steering angle to be corrected by said compensation means.
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 heat exchanger of an air conditioner comprising:
at least one refrigerant inlet for connecting a compressor for compressing refrigerant to an expansion device for expanding condensed refrigerant via a piping and for receiving high temperaturepressure refrigerant coming from the expansion device during a cooling mode; and
a plurality of refrigerant outlets for discharging the refrigerant to the compressor,
wherein the number of the refrigerant outlets is greater than that of the at least one refrigerant inlet.
2. The heat exchanger as defined in claim 1, further comprising:
an inlet heat exchanging part having the at least one refrigerant inlet;
at least one branch pipe each connected to the at least one refrigerant inlet of the inlet heat exchanging parts for distributing the refrigerant during a cooling operation mode and for concentrating the refrigerant during a heating operation mode; and
a plurality of branched heat exchanging parts, each one end thereof connected to one end of the at least one branch pipe and each other end thereof formed with the refrigerant outlet.
3. The heat exchanger as defined in claim 2, wherein the branch pipe is a T-shaped three-way pipe, one end of which is connected to the inlet heat exchanging part and remaining two ends of which are connected to two branched heat exchanging parts.
4. The heat exchanger as defined in claim 2, wherein the at least one refrigerant inlet is connected to the expansion device and the refrigerant outlets are connected to the compressor.
5. The heat exchanger as defined in claim 3, wherein the at least one refrigerant inlet is connected to the expansion device and the refrigerant outlets are connected to the compressor.
6. The heat exchanger as defined in claim 2, comprising:
a first heat exchanging part; and
a second heat exchanging part, each part further comprising: a singular inlet heat exchanging part, a singular branch pipe and two branched heat exchanging parts, wherein a refrigerant inlet of the first heat exchanging part and a refrigerant inlet of the second heat exchanging part are connected to the expansion device, and a refrigerant outlet of the first heat exchanging part and a refrigerant outlet of the second heat exchanging part are connected to the compressor.
7. The heat exchanger as defined in claim 3, comprising:
a first heat exchanging part; and
a second heat exchanging part, each part further comprising: a singular inlet heat exchanging part, a singular branch pipe and two branched heat exchanging parts, wherein a refrigerant inlet of the first heat exchanging part and a refrigerant inlet of the second heat exchanging part are connected to the expansion device, and a refrigerant outlet of the first heat exchanging part and a refrigerant outlet of the second heat exchanging part are connected to the compressor.
8. The heat exchanger as defined in claim 2, comprising:
a first heat exchanging part; and
a second heat exchanging part, each part further comprising: a singular inlet heat exchanging part, a singular branch pipe and two branched heat exchanging parts, wherein a refrigerant inlet of the first heat exchanging part is connected to the expansion device, the refrigerant outlet of the first heat exchanging part is connected to the refrigerant inlet of the second heat exchanging part, and the refrigerant outlet of the second heat exchanging part is connected to the compressor.
9. The heat exchanger as defined in claim 8, further comprising an expansion valve disposed on a connection passage for connecting the refrigerant outlet of the first heat exchanging part and the refrigerant inlet of the second heat exchanging part, and for adjusting an openness so that condensation heat of the first heat exchanging part and evaporation heat of the second heat exchanging part can match during a constant temperature dehumidifying operation.
10. The heat exchanger as defined in claim 2, comprising:
a first heat exchanging part; and
a second heat exchanging part, each part further comprising: a singular inlet heat exchanging part, a singular branch pipe and two branched heat exchanging parts, wherein a refrigerant inlet of the first heat exchanging part is connected to the expansion device, the refrigerant outlet of the first heat exchanging part is connected to the refrigerant inlet of the second heat exchanging part, and the refrigerant outlet of the second heat exchanging part is connected to the compressor.
11. The heat exchanger as defined in claim 10, further comprising an expansion valve disposed on a connection passage for connecting the refrigerant outlet of the first heat exchanging part and the refrigerant inlet of the second heat exchanging part, and for adjusting an openness so that condensation heat of the first heat exchanging part and evaporation heat of the second heat exchanging part can match during a constant temperature dehumidifying operation.