Driving systems of AC motor
AssigneeHitachi Industrial Equipment Systems Co., Ltd.
InventorsDaigo Kaneko, Yoshitaka Iwaji, Kiyoshi Sakamoto, Tsunehiro Endo, Tomofumi Okubo
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Abstract
An AC motor control apparatus that is applicable to commonly used PM motors and capable of detecting the magnetic pole position with simple algorithm. The AC motor control apparatus comprises an inverter for applying arbitrary AC power to an AC motor and a controller for sending a control signal to the inverter. The controller comprises a ripple current generator for supplying a ripple current to the AC motor and a magnetic pole position estimator. The magnetic pole position estimator observes at least two current values of the ripple current for both positive and negative sides of the ripple current to estimate the magnetic pole position of the AC motor.
Claims20
An AC motor control apparatus comprising a controller which sends a control signal to an inverter which supplies arbitrary AC power to an AC motor, said controller comprising:
- a ripple current generator for supplying a ripple current to said AC motor;
- and
- a magnetic pole position estimator,
- wherein said ripple current generator outputs a voltage command Vhd*, and
- wherein said magnetic pole position estimator receives said voltage command Vhd*, an exciting current component Idc of a motor current, and a torque current component lqc of said motor current as input, and said magnetic pole position estimator outputs a position error Δ⊖ to estimate the magnetic pole position of said AC motor.
An AC motor control apparatus comprising a controller which sends a control signal to an inverter which supplies arbitrary AC power to an AC motor, said controller comprising:
- a ripple current generator for supplying a ripple current to said AC motor;
- and
- a magnetic pole position estimator,
- wherein said ripple current generator outputs rectangular waveform voltages with different amplitudes in sequence as a voltage command Vhd * and said magnetic pole position estimator receives said voltage command Vhd* an exciting current component Idc of a motor current, and a torque current component lqc of said motor current as input, and said magnetic pole position estimator outputs a position error Δ⊖ to estimate the magnetic pole position of said AC motor.
An AC motor control apparatus comprising a controller which sends a control signal to an inverter which supplies arbitrary AC power to an AC motor, said controller comprising:
- a ripple current generator for supplying a ripple current to said AC motor;
- and
- a magnetic pole position estimator,
- wherein said ripple current generator outputs a stepwise waveform voltage as the voltage command Vhd * or outputs rectangular waveform voltages with different amplitudes in sequence as a voltage command Vhd * and said magnetic pole position estimator receives said voltage command Vhd*, an exciting current component Idc of motor current, and a torque current component Iqc of said motor current as input, and said magnetic pole position estimator outputs a position error Δ⊖ to estimate the magnetic pole position of said AC motor.
Dependencies are inferred from the claim text.