Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2005-11-10
2009-02-03
Masih, Karen (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S599000, C388S804000
Reexamination Certificate
active
07486038
ABSTRACT:
In a PWM-controlled motor, a motor rotation frequency f, lock determination frequency d, and power supply voltage E are acquired (S1to S3). The d is compared to the f (S4). When f is not less than that of d, Max.Duty is calculated by the following equation for setting: Max.Duty=D0*Kf (S5, S6). D0is an allowable Duty value and can be calculated by [DP0=a−bE] (a: fixed Duty value, b: Duty characteristic coefficient). Kf is a frequency adjustment coefficient. Kf corrects the allowable Duty value D0in accordance with the motor rotation frequency f and can be calculated by the following equation: Kf=1+(f−d)/c (c: restriction start frequency, d: lock determination frequency). When f is less than d, Max.Duty=D0is set (S7, S6). When the motor enters a locked state, the Duty value is suppressed to not more than the allowable Duty value D0to thereby suppress a lock current. This reduces a lock current at low temperature time to prevent demagnetization of a magnet as well as reduces a load of a switching device.
REFERENCES:
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International Preliminary Report on Patentability and Written Opinion of the International Searching Authority issued Jun. 26, 2007 in International (PCT) Application No. PCT/JP2005/020577 of which the present application is the U.S. National Stage.
Masih Karen
Mitsuba Corporation
Wenderoth , Lind & Ponack, L.L.P.
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