System and method for driving synchronous motor

Details System and method for driving synchronous motor System and method for driving synchronous motor

2006-08-17

2008-03-11

Masih, Karen (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Field winding circuits

C318S700000, C318S718000, C318S722000

Reexamination Certificate

active

07342378

ABSTRACT:
A driving apparatus of a synchronous motor fixes all the switching devices of an inverter at OFF in accordance with a value of an all-OFF control pulse signal outputted by a pulse generator. A motor current keeps flowing through free wheel diodes for a predetermined period even after all the switching devices shift to the OFF state. Therefore, pulse generator changes an induced voltage detection signal to an H (high) level after the passage of the time in which a motor current drops down to zero. A terminal voltage of the motor is taken in to acquire an induced voltage and a rotor position is estimated.

REFERENCES:
patent: 2003/0062887 (2003-04-01), Lau
patent: 11-341869 (1999-12-01), None
patent: 2002-095283 (2002-03-01), None
patent: 2004-343913 (2004-12-01), None

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