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Motor excitation device and dead-time compensation method thereof

A technology of motor excitation and dead zone compensation, applied in the control of generator, motor generator control, electronic commutation motor control, etc., can solve the problem of phase current zero-crossing waveform distortion and other problems

Inactive Publication Date: 2013-12-18
HANGZHOU RIDING CONTROL TECH
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Problems solved by technology

[0008] Aiming at the above-mentioned technical problems existing in the prior art, the present invention provides a motor excitation device and its dead zone compensation method, which can solve the problem of phase current zero-crossing waveform distortion by performing dead zone compensation on the inverter output voltage, Ensure the normal performance of the motor

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  • Motor excitation device and dead-time compensation method thereof
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  • Motor excitation device and dead-time compensation method thereof

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Embodiment Construction

[0052] In order to describe the present invention more specifically, the technical solutions and related principles of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0053] Such as image 3 As shown, a motor excitation device includes an inverter circuit and a controller; both ends of the DC side of the inverter circuit are connected to a DC voltage source and a bus capacitor C is connected in parallel, and the AC side of the inverter circuit is connected to the three-phase rotor winding of the motor. Corresponding connection;

[0054] The inverter circuit adopts a three-phase full-bridge inverter topology, and each bridge arm is constructed by an IGBT.

[0055] The controller includes a phase current sampling unit, a photoelectric encoding unit, a coordinate transformation module, a filtering module, a coordinate inverse transformation module and a zero-crossing compensation processing unit; w...

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Abstract

The invention discloses a dead-time compensation method of a motor excitation device. A section is arranged near a phase current zero crossing point, and corresponding compensation is directly performed beyond the section according to the current direction. Pulse width compensation is performed in the section according to a cubic curve, and in other words, due to the fact that the larger uncertainty of polarity of currents is, the closer the zero point is, the compensation effect at the moment is correspondingly weakened so that influences brought by misjudgment of the polarity of the currents of the zero crossing point can be weakened. The invention further discloses a motor excitation device for achieving the method. The motor excitation device comprises an inverter circuit and a controller. The controller comprises a phase current sampling unit, an optoelectronic coding unit, a filtering unit and a zero crossing compensation processing unit. The device can solve the problem of waveform distortion at the phase current zero crossing point, and normal performance of a motor is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of PWM dead zone compensation, and in particular relates to a motor excitation device and a dead zone compensation method thereof. Background technique [0002] Traditional motors generally require excitation equipment to supply power to their rotors, and most of these excitation equipment use PWM (pulse width modulation) wave generation technology. Its main circuit topology is as follows: a voltage source provides a DC voltage, and then through a three-phase full-bridge inverter circuit, an adjustable voltage output is generated to excite the motor rotor. For a three-phase full-bridge inverter circuit, each phase circuit consists of two power switching devices with freewheeling diodes connected in series, usually called the upper bridge arm connected to the positive pole of the DC power supply, and the lower bridge arm connected to the negative pole. . The switching of the power switching device takes a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02P21/14
Inventor 毛仁超罗欣吕晓东胡觉远
Owner HANGZHOU RIDING CONTROL TECH
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