Synchronous-motor controller

Details Synchronous-motor controller Synchronous-motor controller

2006-03-28

2006-03-28

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

C318S254100, C318S432000, C318S434000, C361S024000

Reexamination Certificate

active

07019480

ABSTRACT:
A synchronous-motor controller including an inverter for converting direct current to alternating current in order to supply a synchronous motor with a current responsive to a torque instruction value, a temperature sensor for measuring a temperature of the inverter and a control unit. The control unit detects a locking of the synchronous motor although current is supplied to the synchronous motor and calculates, based on the torque instruction value, a heating value of a switching element of the inverter at the time when the switching element is supplied with the current after the synchronous motor is in a locked condition, wherein a temperature of the switching element is estimated by adding the calculated heating value to an initial value of the temperature of the inverter measured by the temperature sensor when the locking of the synchronous motor is detected.

REFERENCES:
patent: 5857349 (1999-01-01), Hamaoka et al.
patent: 5934398 (1999-08-01), Hotta
patent: 6114828 (2000-09-01), Matsunaga et al.
patent: A 9-215388 (1997-08-01), None
Ken Dutton, et al:“The Art of Control Engineering”, Addison-Wesley Publishing, 1997. p. 40 teaches the method of calculating temperature increment of a device as a function of time.

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