Motor control device

In an arrangement having an electric power inverter (3) which applies a voltage to an AC motor (1) and a control unit (4) which calculates a voltage command value applied in PWM signals, detection use voltages Vup, Vvp and Vwp are applied in synchronism with PWM signal generation use carrier waves i...

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Bibliographic Details
Main Authors MASAKI, RYOSO, OBARA, SANSHIRO, HOMBU, MITSUYUKI, SAKURAI, YOSHIMI, KANEKO, SATORU
Format Patent
LanguageEnglish
French
German
Published 08.04.2009
Subjects
CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS
CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
GENERATION
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Summary:In an arrangement having an electric power inverter (3) which applies a voltage to an AC motor (1) and a control unit (4) which calculates a voltage command value applied in PWM signals, detection use voltages Vup, Vvp and Vwp are applied in synchronism with PWM signal generation use carrier waves in the control unit (4) as well as motor currents iv and iv are detected in response to current detection pulses Pd in synchronism therewith. In a magnetic pole position detection unit (12), counter electromotive forces of the synchronous motor (1) are estimated from a relationship between the detection use voltages Vup, Vvp and Vwp and current difference vectors of the motor current to determine a magnetic pole position through calculation. The determined magnetic pole position is inputted to coordinate conversion units (8, 11) and a motor speed detection unit (13). Thereby, a motor control device having a control characteristic of a good response property with no magnetic pole position sensor is provided for a control system of a synchronous motor.
Bibliography:Application Number: EP20000122392