1. A disk drive comprising:
a drive motor on a base configured to support and rotate a recording medium;
a carriage supporting a head configured to perform information processing with the recording medium, on the base to be pivotable around a central axis between a retracted position where the head is on an outer peripheral side of the recording medium and an information processing position where the head is on the recording medium;
a first magnetic attraction portion on the carriage configured to attract the carriage toward the retracted position;
an attaching stop on the base configured to attach to the carriage and to position the carriage in the retracted position when the carriage is moved to the retracted position; and
a latch configured to latch and hold the carriage in the retracted position when the disk drive receives an external force when the carriage is in the retracted position,
wherein the latch comprises an engaging portion on the carriage, a latching portion on the base configured to pivot around an central axis in a latchable range where the latching portion is configured to latch the engaging portion of the carriage and a released position in which the latching portion is out of a movement path of the engaging portion in order to unlatch the engaging portion, and a second magnetic attraction portion on the latching portion configured to attract the latching portion toward the released position,
the carriage and the latching portion are configured to satisfy
Tb\xb7Jc\u2266Tm\xb7Jl,
where Jc is the moment of inertia of the carriage, Jl is the moment of inertia of the latching portion, Tb is the magnetic attraction of the second magnetic attraction portion, and Tm is the magnetic attraction of the first magnetic attraction portion,
the carriage is held in the retracted position by contacting the attaching stop in a non-operational state, and the latching portion is configured to pivot in a latching direction within the latchable range before the engaging portion of the carriage starts to move when a rotational impact externally acts in a direction to pivot the carriage toward the information processing position with the latching portion contacting the carriage and in the latchable range inside a trajectory of the engaging portion.
2. The disk drive of claim 1, wherein the latching portion comprises a first contact portion configured to contact the carriage when the carriage is pivoted from the information processing position to the retracted position and to cause the latching portion to pivot from the released position to the latchable range as the carriage is pivoted, and a latch hook configured to latch the engaging portion of the carriage within the latchable range.
3. The disk drive of claim 2, wherein the latching portion comprises a support portion pivotably supported on the base, and the first contact portion and the second magnetic attraction portion are on the opposite side of the support portion from the latch hook.
4. The disk drive of claim 3, wherein the latch comprises a latch stop on the base and configured to keep the latching portion from pivoting toward the released position, and the latching portion comprises a second contact portion on the same side as the latch hook with respect to the support portion and configured to contact the latch stop when the latching portion is pivoted to the released position.
5. The disk drive of claim 4, further comprising:
a motor comprising
a magnet on the base; and
a coil on the carriage configured to pivot the carriage,
wherein the carriage comprises:
a bearing portion configured to pivot on the base;
an arm extending from the bearing portion and supporting the head; and
a support frame extending from the bearing portion and supporting the coil, and
the first and second magnetic attraction portions are at positions to be magnetically attracted by the magnet.
6. A disk drive comprising:
a drive motor on a base configured to support and rotate a disk recording medium;
a carriage supporting a head, configured to perform information processing with the recording medium, on the base to be pivotable around a central axis between a retracted position where the head is on an outer peripheral side of the recording medium and an information processing position where the head is on the recording medium;
a first magnetic attraction portion on the carriage configured to attract the carriage toward the retracted position;
an attaching stop on the base configured to attach to the carriage and to position the carriage in the retracted position when the carriage is moved to the retracted position; and
a latch configured to latch and hold the carriage in the retracted position when the disk drive receives an external force while the carriage is in the retracted position,
wherein the latch comprises an engaging portion on the carriage, a latching portion on the base is configured to pivot around a central axis in a latchable range where the latching portion is configured to latch the engaging portion of the carriage and a released position in which the latching portion is out of a movement path of the engaging portion in order to unlatch the engaging portion, and a second magnetic attraction portion on the latching portion is configured to attract the latching portion toward the released position,
the engaging portion of the carriage is configured to move along a circular trajectory around a rotational axis of the carriage and the latching portion is configured to move along a circular trajectory around a rotational axis of the latching portion,
the carriage is held in the retracted position by contacting the attaching stop in a non-operational state, the latching portion is held in the latchable range inside the circular trajectory of the engaging portion with contacting the carriage in the non-operational state, and the latching portion is arranged and configured to pivot from the position in the non-operational state toward the latchable range before the engaging portion of the carriage reaches an intersection of the respective circular trajectories of the engaging portion and the latching portion when a rotational impact externally acts in a direction to pivot the carriage toward the information processing position.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1-18. (canceled)
19. A blower motor assembly comprising:
a variable speed motor and motor controller;
a power input electrically coupled with the motor controller and comprising at least a first input for receiving AC power from an AC power source and first and second neutral inputs; and
a sensing circuit for sensing current in the first or second neutral inputs and for delivering a corresponding signal to the motor controller for selecting at least one operating parameter for the motor, the sensing circuit including a capacitor coupled to an input of the motor controller such that an electrical characteristic of the capacitor is related to the corresponding signal to the motor controller.
20. The blower motor assembly as set forth in claim 19, wherein the at least one operating parameter includes at least one of a speed table, a torque table, a mode selection, one or more blower coefficients, and a rotation direction of the motor.
21. The blower motor assembly as set forth in claim 19, wherein the capacitor is charged and discharged in response to current pulses from the current transformer and the transistor for providing the signal to the motor controller.
22. The blower motor assembly as set forth in claim 19, further including a rectifier coupled between the power input and the motor controller for converting the AC power to DC power and delivering the DC power to the motor controller.
23. The blower motor assembly as set forth in claim 19, the current transformer comprising a toroidal core transformer.
24. The blower motor assembly as set forth in claim 23, wherein the toroidal core transformer has about 30 or more turns.
25. The blower motor assembly as set forth in claim 19, the sensing circuit further including a first resistor coupled in parallel between the current transformer and the transistor for defining a minimum load on the current transformer.
26. The blower motor assembly as set forth in claim 25, the sensing circuit further including a second resistor coupled in series between the current transformer and the transistor for limiting current delivered to the transistor by the current transformer.
27. The blower motor assembly as set forth in claim 26, the sensing circuit further including a diode coupled in parallel between the current transformer and the transistor for protecting a base emitter junction of the transistor.
28. The blower motor assembly as set forth in claim 27, the sensing circuit further including a third resistor coupled between the transistor and the capacitor for limiting current delivered to the capacitor from the transistor.
29. The blower motor assembly as set forth in claim 28, the sensing circuit further including a fourth resistor coupled between a voltage source and the capacitor for charging the capacitor.
30. The blower motor assembly as set forth in claim 19, wherein the variable speed motor is a brushless permanent magnet motor.
31. A blower motor assembly comprising:
a variable speed motor and motor controller;
a power input electrically coupled with the motor controller and comprising at least a first input for receiving AC power from an AC power source and first and second neutral inputs; and
a sensing circuit for sensing which of at least one of the first and second neutral inputs power is applied to and for delivering a corresponding signal to the motor controller for selecting at least one operating parameter for the motor, the sensing circuit including a current transformer for sensing current in the first or second neutral inputs, a single transistor coupled with the current transformer for amplifying an output of the current transformer, and a capacitor coupled to an input of the motor controller for providing the corresponding signal to the motor controller.
32. The blower motor assembly as set forth in claim 31, wherein the capacitor is charged and discharged in response to current pulses from the current transformer and the transistor for providing the signal to the motor controller.
33. The blower motor assembly as set forth in claim 31, further including a rectifier coupled between the power input and the motor controller for converting the AC power to DC power and delivering the DC power to the motor controller.
34. The blower motor assembly as set forth in claim 31, wherein the variable speed motor is a brushless permanent magnet motor.
35. The blower motor assembly as set forth in claim 31, wherein the at least one operating parameter includes at least one of a speed table, a torque table, a mode selection, one or more blower coefficients, and a rotation direction of the motor.