Method for driving a synchronous electric motor in...

Details Method for driving a synchronous electric motor in... Method for driving a synchronous electric motor in...

2007-08-28

2007-08-28

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Field winding circuits

C318S132000, C318S434000, C318S700000, C318S715000, C318S254100

Reexamination Certificate

active

11172374

ABSTRACT:
A method drives a synchronous electric motor, particularly to start a fan/exhaust fan. The method includes measuring the supply voltage value of the electric motor windings being proportional to the mass flow rate. The method also includes measuring a real load angle, by a signal coming from a Hall sensor associated with the motor rotor; performing a comparison with an optimal load angle corresponding to a reference mass flow rate of fluid being exhausted; and changing the voltage value and the operating frequency applied to the electric motor up to reach a value of the real load angle corresponding to said optimal load angle value.

REFERENCES:
patent: 4511834 (1985-04-01), Studtmann
patent: 4740738 (1988-04-01), El-Antably et al.
patent: 5006774 (1991-04-01), Rees
patent: 6741049 (2004-05-01), Kawaji et al.
patent: 0403806 (1990-12-01), None
patent: 0702451 (1996-03-01), None
patent: 1512949 (2005-03-01), None

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