Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2007-07-25
2010-12-07
Benson, Walter (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S400030, C318S400110, C318S400330
Reexamination Certificate
active
07847498
ABSTRACT:
When starting a brushless motor, if the stop position of the rotor is detected between time t1and time t2, a start-up excitation pattern in accordance with the rotor stop position is input for an initial energization time Ts1. Afterward, when the energization is stopped, a plurality of signals SL1, SL2, SL3, SL4are generated in sequence in excitation switch timing signals in accordance with the rotational position of the coasting rotor. From these signals SL1to SL4, the rotor position is detected using the second and subsequent signals SL2to SL4and then the process shifts to ordinary energization switch control. In accordance with the present invention, it is possible to start up a motor in a short time with a simple method so as to obtain a large torque during start-up.
REFERENCES:
patent: 6704261 (2004-03-01), Watt et al.
patent: 2004/0036436 (2004-02-01), Tieu
patent: 6-25224 (1994-04-01), None
patent: 2001-128485 (2001-05-01), None
patent: 2001-211684 (2001-08-01), None
patent: 2002-335691 (2002-11-01), None
patent: 2004-040943 (2004-02-01), None
Benson Walter
Glass Erick
Kenyon & Kenyon LLP
Mitsuba Corporation
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