Title: Control device of brushless electromotor
Application Number: 200610146719 Application Date: 2006.11.16
Publication Number: 1968001 Publication Date: 2007.05.23
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H02P6/18;H02P6/08
Applicant(s) Name: Hitachi Air Conditioner Domestic Appliance KK Address:
Inventor(s) Name: Hizume Tatsuya;Endo Tsunehiro;Noto Genyasuo
Attorney & Agent: xujing
Abstract:
    There is provided a DC control device of brushless electromotor driven by a load which loading torque exhibits a periodic variation, such as a compressor used for an air conditioner, with low input, low vibration and low noise. The device comprises a DC brushless electromotor used for rotatablely driving a load with a loading torque exhibiting a periodic variation; an inverter circuit used for PWM controlling said DC brushless electromotor; a rectification circuit used for commutating an industrial alternating current source and supplying it to said inverter circuit; a signal generating unit used for driving said inverter circuit; an unit used for detecting an induction voltage in the phase without electric current in the DC brushless electromotor and estimating the rotation position of said rotor; an unit used for measuring the required time between a start of a commutation and an end of the next commutation; an unit used for permuting the required time as sin ponderance and cos penderance by performing a fourier transform to the required time for rotating 360 DEG; an unit used for compensating for the induction voltage, on the basis of the sin ponderance and the cos ponderance.
Time: 9