Title:
SYSTEM AND METHOD FOR CONTROLLING A SYNCHRONOUS ELECTRIC MOTOR, PARTICULARLY FOR HOUSEHOLD APPLIANCES
Document Type and Number:
WIPO Patent Application WO2007013020
Kind Code:
A9
Abstract:
The system (ECS) comprises a rectifier circuit (RC) to supply a direct current voltage (VB) as output; a driver circuit (DC) which is connected to a rectifier circuit (RC) and includes a plurality of controlled switches (SW1-SW4) which can permit passage of a current in the stator winding (W) selectively in one direction and in the opposite direction; a sensor (PS) which can supply a signal (H) which is indicative of the angular position of the rotor (R) ; and a control circuit (CC) which is designed to receive a signal (RS) which is indicative of the speed of rotation required (?ref) for the motor (M) , and is connected to the position sensor (PS) . The control circuit is designed to generate, from the passage of the rotor (R) to a predetermined position, a counting signal (N) which is a function of the time (t) , and to reset this signal (N) when it reaches a predetermined value (Nref) corresponding to the speed of rotation required (?ref) for the motor (M) ; and then to control the driver circuit (DC) selectively on the basis of the position signal (H) of the rotor or on the basis of the counting signal (N) , when the speed of rotation (?) of the motor (M) is respectively lesser and greater than the speed required (?ref) .
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Inventors:
ACQUAVIVA SEBASTIANO (IT)
Application Number:
PCT/IB2006/052528
Publication Date:
June 14, 2007
Filing Date:
July 24, 2006
Export Citation:
Assignee:
EMERSON APPLIANCE MOTORS EUROPE (IT)
ACQUAVIVA SEBASTIANO (IT)
ACQUAVIVA SEBASTIANO (IT)
International Classes:
H02P6/20
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