Method for power control of an electric motor

Details Method for power control of an electric motor Method for power control of an electric motor

2005-10-05

2008-03-11

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Phasing or angular or linear positional control of movable...

C318S799000, C318S629000, C363S039000, C363S045000, C323S212000, C323S219000

Reexamination Certificate

active

07342372

ABSTRACT:
The invention relates to a method for power control of an electric motor, in particular a motor for driving the suction fan of a vacuum cleaner connected to an AC mains power supply. The power control is effected by varying the phase angle of the electric alternating quantity supplied to the motor by the use of semiconductor switches. AC power supplied to the motor is switched by using different delay times for the switching in each half-period of a full AC period to suppress odd harmonics, particularly the third harmonic of the mains power line frequency. Half-periods of a full period are mirrored in the next consecutive full period in order to suppress even harmonics, particularly the second harmonic of the mains power line frequency. A set of delay times t1and t2are defined and selected to be used in further avoiding critical delay time areas for harmonics and minimize the generation of vibrations.

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Anonymous Author, Method of Reducing Harmonics in the Current of Triac Controlled Mains Fed Motors, Research Disclosure Journal, Nov. 1994, Journal No. 36710, Kenneth Mason Publications Ltd:, Westbourne, United Kingdom.

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