Motor driving apparatus

A driving device and motor technology, applied in the direction of control of electromechanical transmission, motor generator control, AC motor control, etc., can solve the problems of no contribution, low efficiency, decreased efficiency, etc., and achieve the effect of further stabilizing the weak magnetic field control
CN1571265AActive Publication Date: 2005-01-26III HLDG 7
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
III HLDG 7
Publication Date
2005-01-26

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Abstract

The invention carries out field weakening control on a brushless motor without use of preset controlled variables, such as table values, and independently of the input voltage of an inverter circuit 3 in a motor driving device that drives the brushless motor. The motor driving device comprises an inverter circuit 3 that converts the output voltage of a voltage source 1 into a three-phase alternating current, and outputs it to a motor 2; a rotor position estimating unit 5 that estimates the rotor position of the brushless motor; and an inverter control unit 4a that controls the inverter circuit 3 so that the brushless motor is driven by a current based on the estimated rotor position. The inverter control unit 4a determines a value [beta] of advance angle, which is the advance angle of a current supplied to the brushless motor relative to the estimated rotor position, so that the difference between commanded number of revolutions fo and actual number of revolutions f is minimized.
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Description

technical field

[0001] The present invention relates to a motor driving device, in particular to a motor driving device using an inverter circuit to drive and control a brushless motor. Background technique

[0002] The brushless motor generates counter electromotive force ωE (E: magnetomotive force (main magnetic flux) of a permanent magnet for a magnetic field, ω: shaft angular velocity of the motor) due to its operation. Therefore, an equivalent circuit corresponding to the brushless motor 1 can be represented as shown in FIG. 11( a ).

[0003] In Figure 11(a), R is the primary resistance of each phase of the brushless motor, L is the inductance of each phase of the brushless motor, I is the primary current (phase current) of the brushless motor, and V is the terminal applied to the motor Voltage.

[0004] When the brushless motor is driven by an inverter circuit, the value obtained by multiplying the voltage conversion ratio (output voltage / input voltage<1) of the i...

Claims

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