Back EMF Reduction in a Storage Drive Using Pulse Width Modulation in a Closed Loop Motor Control System
AssigneeInternational Business Machines Corporation
InventorsAllen K. Bates, Nhan Xuan Bui, Reed A. Hancock, Louis P. Russo
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Abstract
A storage drive implements a method for a BEMF voltage reduction during a deceleration period of an electric motor of the storage drive. In operation, the electric motor is disconnected from a power supply during an entirety of the deceleration period of the electric motor to prevent any flow of a BEMF current into the power supply, and the electric motor is connected to a power return during a segment or an entirety of the deceleration period of the electric motor to dissipate any BEMF voltage within the electric motor.
Claims20
A method for a BEMF voltage reduction in a storage device including an electric motor, the method comprising:
- disconnecting the electric motor from a power supply during an entirety of a deceleration period of the electric motor to prevent any flow of a BEMF current into the power supply;
- and
- connecting the electric motor to a power return during at least a first segment of the deceleration period of the electric motor to dissipate any BEMF voltage within the electric motor.
A storage drive, comprising:
- an electric motor;
- and
- a motor controller
- wherein the motor controller is operable to disconnect the electric motor from a power supply during an entirety of a deceleration period of the electric motor to prevent any flow of a BEMF current into the power supply;
- and
- wherein the motor controller is further operable to connect the electric motor to a power return during at least a first segment of the deceleration period of the electric motor to dissipate any BEMF voltage within the electric motor.
An article of manufacture for performing operations to reduce a BEMF voltage in a storage drive including an electric motor, the operations comprising:
- disconnecting the electric motor from a power supply during an entirety of a deceleration period of the electric motor to prevent any flow of a BEMF current into the power supply;
- and
- connecting the electric motor to a power return during at least a first segment of the deceleration period of the electric motor to dissipate any BEMF voltage within the electric motor.
Dependencies are inferred from the claim text.