Frequency converter peak voltage absorbing device, method and system

A technology of peak voltage and absorption device, applied in the field of inverter peak voltage absorption device, can solve the problems of affecting motor torque, high cost, large filter volume, etc., and achieve the effects of convenient installation, low cost, and elimination of damage

Inactive Publication Date: 2015-03-25
BEIJING INST OF COMP TECH & APPL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] When the power is large, the size of the filter will be relatively large and the cost will be high
The sine wave filter will also affect the torque of the motor due to the large voltage drop.

Method used

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  • Frequency converter peak voltage absorbing device, method and system
  • Frequency converter peak voltage absorbing device, method and system
  • Frequency converter peak voltage absorbing device, method and system

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Embodiment Construction

[0030] The specific implementation manners of the present invention will be described below in conjunction with the drawings and embodiments.

[0031] In order to effectively eliminate the damage to the motor stator winding caused by the peak voltage generated by the frequency converter, the present invention proposes a frequency converter spike voltage absorber (Surge Voltage Absorber, SVA) for absorbing the peak voltage.

[0032] Such as figure 1 Shown is a schematic structural diagram of the motor system 100 of the present invention. The motor system 100 includes a frequency converter 10 , a motor 20 and a frequency converter peak voltage absorption device 30 (hereinafter referred to as the absorption device). The absorption device 30 is connected in parallel to the electric machine 20 . The motor 20 is an AC motor. The absorbing device 30 detects the peak voltage at the input terminal of the power supply of the motor 20. When the absorbing device 30 detects that the pea...

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Abstract

The invention discloses a frequency converter peak voltage absorbing device, method and system. The absorbing device is connected in parallel with a motor. The absorbing device comprises a peak voltage detector, a switch element, and an electric energy-heat energy converter, wherein the switch element is connected between a power input end of the motor and the electric energy-heat energy converter; the peak voltage detector detects the peak voltage of the power input end of the motor, when the peak voltage exceeds a detection threshold value, the peak voltage detector triggers the switch element to be conducted, so the electric energy-heat energy converter can receive the peak voltage of the power input end of the motor for converting into heat energy. The frequency converter peak voltage absorbing device is simple in structure, low in cost and convenient to install, does not generate voltage drop, does not affect the torque of the motor, at the same time, can effectively eliminate damage caused by a frequency converter to a motor stator winding, and substantially absorbs the peak voltage for converting into the heat energy for dissipation.

Description

technical field [0001] The invention relates to the field of motor protection, in particular to a frequency converter spike voltage absorption device, method and system. Background technique [0002] In the prior art, it is necessary to adjust the rotational speed of the AC motor in many occasions. Especially in recent years, the requirements for energy saving and consumption reduction have been continuously improved, and it is very common to use frequency converters to control equipment such as fans, water pumps, and air compressors. [0003] However, since the voltage waveform of the motor driven by the frequency converter is not a sine wave, but a PWM voltage waveform, this waveform will cause serious damage to the stator windings and bearings of the motor. [0004] The reason why the PWM voltage waveform output by the frequency converter damages the stator winding of the motor is that the PWM pulse voltage is reflected at the motor end, and the incident wave and the ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12
CPCH02M1/12
Inventor 杨继深沈志达
Owner BEIJING INST OF COMP TECH & APPL
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