Power supply device based on common-mode voltage of motor driving circuit

A motor drive circuit and common-mode voltage technology, which is applied to output power conversion devices, AC motor control, electrical components, etc. , strong promotion, simple structure effect

Pending Publication Date: 2022-01-28
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a power supply device based on the common-mode voltage of the motor drive circuit, thereby solving the technical problem of insufficient power in the common-mode voltage power-taking scheme

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  • Power supply device based on common-mode voltage of motor driving circuit
  • Power supply device based on common-mode voltage of motor driving circuit
  • Power supply device based on common-mode voltage of motor driving circuit

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0027] An embodiment of the present invention provides a power supply device based on the common-mode voltage of the motor drive circuit, such as figure 1 As shown, it includes: a PWM inverter and a motor, and the motor is driven by the PWM inverter; it also includes: a compensation capacitor connected in series between the neutral point of the motor and the external load, and the capacitor is u...

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Abstract

The invention discloses a power supply device based on common-mode voltage of a motor driving circuit.Factors influencing the loading capacity of the common-mode voltage are analyzed based on the idea of utilizing the energy of the common-mode voltage, a compensation capacitor is connected in series between a neutral point of a motor and a load, impedance matching is realized by the capacitor and an equivalent inductor in a loop, series resonance is generated, and the power transmission capability of the common-mode voltage to the load side can be effectively improved. Compared with a traditional processing mode of suppressing the common-mode voltage, the energy of the switching subharmonic at the neutral point of the motor, namely the energy of the common-mode voltage at the neutral point, is better utilized. Compared with a mode of directly using the common-mode voltage to supply power to the encoder, the power transmission capability of the common-mode voltage is improved, the problem of insufficient power of a common-mode power taking scheme is solved, and the common-mode voltage is enabled to be possible to supply power to a high-power load.

Description

technical field [0001] The invention belongs to the field of motor and drive control, and more specifically relates to a power supply device based on the common-mode voltage of a motor drive circuit. Background technique [0002] In a single-ended motor system driven by a PWM inverter, the neutral point of the stator winding of the motor will generate a common-mode voltage dominated by the PWM switching frequency. From the perspective of energy conservation and the principle of Fourier transform, it can be known that the operation of the motor itself uses the energy of the fundamental frequency band of the modulation wave, while the harmonics of the switching frequency appear on the neutral point of the stator winding in the form of common-mode voltage. Cannot be exploited by motors. The high-frequency, high-amplitude common-mode voltage has brought a lot of harm to the motor, and will generate shaft current and leakage current in the motor bearing to damage the bearing. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M1/32H02M1/12H02P27/08H02P25/18
CPCH02M7/53871H02M1/32H02M1/12H02P27/08H02P25/18
Inventor 刘自程樊隆源蒋栋
Owner HUAZHONG UNIV OF SCI & TECH
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