Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2011-03-29
2011-03-29
Masih, Karen (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S689000, C318S461000
Reexamination Certificate
active
07915844
ABSTRACT:
This invention provides a motor driving apparatus that made it possible to reduce torque ripples including those attributed to load variation of the motor and an associated method for control of motor revolution. An output stage to a multiphase DC motor is comprised of power elements to supply output voltages to multiphase coils and a predriver to supply drive voltages to the power elements. A resistor means detects a current flowing through the power elements. A supply current detector detects a voltage signal produced across the resistor means as a supply current, using a high-speed ADC and a moving average filter. An output controller generates a PWM signal with a frequency lower than the frequency of the high-speed ADC so that the current detected by the supply current detector conforms to a current signal indicating a motor revolving speed and transfers the PWM signal to the output stage.
REFERENCES:
patent: 5134487 (1992-07-01), Taguchi et al.
patent: 7088063 (2006-08-01), Kurosawa et al.
patent: 10-341588 (1998-12-01), None
patent: 2005-102447 (2005-04-01), None
Kokami Yasuhiko
Kurosawa Minoru
Masih Karen
Mattingly & Malur, P.C.
Renesas Electronics Corporation
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