Solenoid/magnetic hold brake with power off magnet hold function
AssigneeGoodrich Corporation
InventorsWesley K. Stegmiller, Wallace H. Larson, Scott P. Harms
Life of this patent
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Abstract
A power drive unit (PDU) having a magnetic hold brake for use in an aircraft is disclosed herein. The PDU includes a wheel configured to convey cargo through a portion of the aircraft, a motor coupled to the wheel, a brake disk, a solenoid configured to apply a first force to move the brake disk in a first direction to resist rotation of the motor, wherein the solenoid is further configured to apply a second force to move the brake disk in a second direction opposite the first direction to allow the motor to rotate, and a magnet configured to apply a third force to the brake disk, the third force being in the first direction to apply a drag force to the motor.
Claims16
A power drive unit (PDU) having a magnetic hold brake for use in an aircraft, the PDU comprising:
- a wheel configured to convey cargo through a portion of the aircraft;
- a motor coupled to the wheel;
- a brake disk;
- a solenoid configured to apply a first force on the brake disk to move the brake disk in a first direction to resist rotation of the motor, wherein the solenoid is further configured to apply a second force on the brake disk to move the brake disk in a second direction opposite the first direction to allow the motor to rotate, wherein the solenoid applies the first force in response to a first current having a first polarity and wherein the solenoid applies the second force in response to a second current having a second polarity that is opposite the first polarity;
- and
- a magnet having the first polarity and configured to apply a third force on the brake disk, the third force being in the first direction to apply a drag force to the motor.
A magnetic hold brake, comprising:
- a brake housing;
- a brake disk;
- a solenoid disposed within the brake housing, the solenoid configured to apply a first force on the brake disk to move the brake disk in a first direction to a first position in response to a first current having a first polarity, the first position being a braking position;
- and
- a magnet having the first polarity and configured to apply a second force on the brake disk to hold the brake disk in the first position, wherein the solenoid is configured to apply a third force on the brake disk allowing the brake disk to move in a second direction to a second position in response to a second current having a second polarity that is opposite the first polarity, the second direction being opposite the first direction.
A power drive unit (PDU) having a magnetic hold brake for use in an aircraft, the PDU comprising:
- a wheel configured to convey cargo through a portion of the aircraft;
- a motor configured to generate torque;
- a gearbox coupled to the wheel;
- a motor shaft coupled to the motor and the gear box to transfer torque from the motor to the gearbox;
- a brake disk;
- a solenoid coupled to the motor shaft and the brake disk and configured to apply a first force on the brake disk to move the brake disk in a first direction to a braking position in response to a first electric current having a first polarity;
- a spring disposed in the solenoid and configured to apply a second force in a second direction on the brake disk, the second direction being opposite the first direction;
- and
- a magnet having the first polarity and disposed around the solenoid and configured to apply a third force in the first direction on the brake disk.
Dependencies are inferred from the claim text.