Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2006-01-10
2008-12-02
Masih, Karen (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S787000, C318S788000, C318S820000
Reexamination Certificate
active
07459878
ABSTRACT:
The method and circuit for controlling a sensorless single-phase BLDCM having a stator with a winding are proposed. The provided controlling circuit includes a power supply circuit, an inverter coupled to the winding and the power supply circuit, a BEMF detecting circuit coupled to the winding and the inverter and measuring a BEMF of the winding, and a controller coupled to the power supply circuit, the inverter and the BEMF detecting circuit and analyzing a status of the BEMF to control the BLDCM accordingly. The provided method is based on the motor winding time-sharing theory, and the controller controls the inverter to make the winding used as a driving element with loading current when the absolute value of the BEMF is relatively large and as a sensing element when the absolute value of the BEMF is relatively small.
REFERENCES:
patent: 5598071 (1997-01-01), Dunfield et al.
patent: 2005/0110514 (2005-05-01), Trifilo
patent: 2005/0237023 (2005-10-01), Zhang
patent: 2632936 (2004-08-01), None
Huang Shih-Ming
Huang Wen-Shi
Jin Wanbing
Wang Weizi
Wu Zhigan
Delta Electronics , Inc.
Masih Karen
Volpe and Koenig P.C.
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