Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2011-07-12
2011-07-12
Benson, Walter (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S400140, C318S400320, C318S721000
Reexamination Certificate
active
07977899
ABSTRACT:
A motor control device is disclosed which is arranged so as to perform a PWM control for a permanent magnet motor including a rotor having a permanent magnet and a stator with a multiphase winding. The motor control device includes a position detection unit which executes an analog computation process for induced voltages of respective phases of the motor based on a phase voltage equation having, as operation terms, respective phase voltages, respective phase currents, winding inductance, winding resistance and a neutral point voltage, the winding inductance and the winding resistance being motor constants of the motor, thereby generating and delivering a rotational position signal of the rotor based on a phase relation of the induced voltages, and a digital processing unit which has a function of generating and delivering a sinusoidal PWM signal based on the rotational position signal, thereby controlling the motor.
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“Application Note” published by Infineon Technologies AG, Germany, AP08059 XC886/888 CM/CLM, V1.0, May 2007, p. 12.
A 8-bit microcontroller model TMP88CH41UG manufactured by Toshiba Corporation, Tokyo.
Chinese Office action for 200810128585 dated Jun. 9, 2010.
Hasegawa Yukihisa
Nagai Kazunobu
Benson Walter
Kabushiki Kaisha Toshiba
Paul Antony M
Pearne & Gordon LLP
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