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Patent Searching and Data


Title:
EXCITATION CIRCUIT AND CONTROL METHOD FOR FLUX SWITCHING MOTOR
Document Type and Number:
WIPO Patent Application WO2004073140
Kind Code:
A3
Abstract:
An excitation circuit for a flux switching motor. The circuit includes a low-value film capacitor across the DC side of a bridge rectifier. A plurality electronic switches are arranged in an H-bridge configuration for switching current flow through an armature winding of the motor in accordance with a PWM control scheme and single-pulse control scheme controlled by a microcontroller. A start-up diode is placed across the field winding of the motor and is electronically switched out of the circuit after a startup phase of the motor has completed. The circuit implements armature energy recirculation through the field winding during startup to promote more uniform and quicker startup of the motor. The use of a film capacitor improves the power factor of the circuit, helps to eliminate the introduction of harmonics into the AC voltage source, and helps in mitigating EMI. Reverse commutation is used to bring the motor to a quick stop when it is powered off.

Inventors:
GORTI BHANU (US)
Application Number:
US2004003297W
Publication Date:
January 27, 2005
Filing Date:
February 05, 2004
Export Citation:
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Assignee:
BLACK & DECKER INC.
GORTI, BHANU
International Classes:
H02P1/00; H02P6/08; H02P6/14; H02P6/20; H02P25/08; H02K; (IPC1-7): H02P1/00
Foreign References:
US6118239A2000-09-12
US6462506B22002-10-08
US5723914A1998-03-03
Other References:
See also references of EP 1602170A2
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