Motor driving system and motor driving method
AssigneeDelta Electronics, Inc.
InventorsCheng-Yun LIN, Chia-Wei CHOU, Chen-Hsiang KUO
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Abstract
A motor driving system includes a controller, motors and motor drivers. In the normal supplying state of a power supply, the controller controls the motor drivers. The motor drivers output driving signals for driving the motors respectively. In an abnormal state or a power-off state of the power supply, one of the motor drivers is set to be a master driver and the others are set to be slave driver. The master driver activates a deceleration energy backup (DEB) function, powers the slave drivers through a common-DC-bus structure, controls the slave drivers, and during deceleration maintains a ratio between frequencies of the driving signals, until all of the motors are decelerated to stop at the same time.
Claims10
A motor driving system, comprising:
- a controller;
- a plurality of motors;
- and
- a plurality of motor drivers, outputting a plurality of driving signals to drive the plurality of motors correspondingly and respectively, wherein the motor drivers form a common-DC-bus structure,
- wherein when a power supply is in a normal supplying state, the controller controls the plurality of motor drivers;
- and
- when the power supply is in an abnormal state or a power-off state, one of the plurality of motor drivers is set to be a master driver and others of the plurality of motor drivers are set to be slave drivers, and the master driver activates a deceleration energy backup function to power and control the slave drivers through the common-DC-bus structure and maintain a ratio between frequencies of the driving signals during deceleration until the plurality of motors are decelerated to stop at the same time.
A motor driving method for a motor driving system comprising a plurality of motors and a plurality of motor drivers, the motor driving method comprising:
- performing a power-on operation;
- determining if a power supply is in an abnormal state or a power-off state;
- setting one of the plurality of motor drivers to be a master driver and others of the plurality of motor drivers to be slave drivers when determining that the power supply is in the abnormal state or the power-off state;
- activating, by the master driver, a deceleration energy backup function to power and control the slave drivers through a common-DC-bus structure;
- and
- outputting, by the plurality of motor drivers, a plurality of driving signals to control the motors respectively, wherein a ratio between frequencies of the plurality of driving signals is maintained during deceleration until the plurality of motors are decelerated to stop at the same time.
Dependencies are inferred from the claim text.