Title: Control device of electric motor
Application Number: 200610164585 Application Date: 2006.12.07
Publication Number: 1980046 Publication Date: 2007.06.13
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H02P6/18;H02P27/04
Applicant(s) Name: Hitachi Appliances Inc. Address:
Inventor(s) Name: Ueda Yoshiro;Funayama Yuji;Okuyama Atsushi;Tamura
Attorney & Agent: xujing
Abstract:
    An electromotor which is optionally rotated due to interference and the like is controlled in a 180 degree power-on manner, thereby all objects of low cost, space saving, low libration, high efficiency can be realized simultaneously. In an inverter circuit composed of a plurality of switch elements, synthetical current information flowed in three-phase (U phase, V phase, W phase) is detected by a diffluent resistor for overcurrent detection to reproduce an outputted current of an inverter synchronous with a PWM signal, thereby, the 180 degree power-on control of performing driving when usually concluding a magnetic pole position of a rotor is achieved. On the other hand, under a condition that the (wind) electromotor generates racing due to interference, the magnetic pole position, a rotation speed, a rotation direction of the electromotor can be directly detected and the electromotor can be started before the inverter performs switching operation on an inductive voltage generated by the rotation of the electromotor.
Time: 6