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US 2006/0179859 A1Published application
Motor controlling device, compressor, air conditioner and refrigerator
AssigneePanasonic Corporation
InventorsHideki Nakata, Mitsuo Ueda
Life of this patent
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Abstract
A motor controller (101) according to the invention comprises an inverter circuit (3) for driving a brushless motor (4) and a control unit for controlling the rotational speed of the brushless motor (4) by controlling the phase of the motor current of the brushless motor (4) through the inverter circuit (3).
Claims21
A motor controller comprising:
- an inverter circuit for driving a brushless motor by applying a sinusoidal wave thereto;
- and
- a control unit for estimating the rotational speed and rotational phase of the brushless motor based on the motor current of the brushless motor, whereby rotational speed fluctuation caused by load torque fluctuation is computed and the current phase of the brushless motor is controlled so as to restrict said rotational speed fluctuation.
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A motor controller comprising:
- a power converter for converting an a.c. power output from an a.c. power source into a d.c. power;
- an inverter circuit for supplying the d.c. power obtained through the conversion by use of the power converter to a brushless motor, thereby driving the brushless motor;
- a capacitor connected between d.c. power input terminals of the inverter circuit;
- and
- a control unit for controlling the rotational speed of the brushless motor by controlling the motor current of the brushless motor through the inverter circuit,
- wherein the control unit controls the motor current so as to restrict the rotational speed fluctuation of the brushless motor caused by load torque fluctuation and controls a current output from the a.c. power source based on the comparison between the amplitude of the motor current and the average of the motor current.
3 more elements
Dependencies are inferred from the claim text.