Control device equipped with motor protection function

Details Control device equipped with motor protection function Control device equipped with motor protection function

2007-08-10

2009-11-03

Masih, Karen (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S471000, C318S635000

Reexamination Certificate

active

07612513

ABSTRACT:
A synchronous motor control device having an optimal protection function in accordance with an operational state of a motor is provided.The motor control device includes a position detecting sensor detecting an angular position of a motor, a speed controller controlling the speed of the motor based on the angular position of the motor detected by the position detecting sensor, a temperature estimation component that estimates the temperature of the motor from a current command value calculated by the speed controller or a torque command value and, when the estimated temperature reaches a threshold, outputs a current cutoff signal to a current controller that cuts off passage of current to the motor, and an operational state determination part determining an operational state of the motor based on the angular position of the motor detected by the position detecting sensor, wherein the temperature estimation component changes the threshold based on the operational state of the motor determined by the operational state determination component.

REFERENCES:
patent: 2004/0264073 (2004-12-01), Zocholl
patent: 6253577 (1994-09-01), None
patent: 9261850 (1997-10-01), None

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