CN201294457Y

CN201294457Y - Test power supply of variable frequency motor

Info

Publication number: CN201294457Y
Application number: CNU2008202115300U
Authority: CN
Inventors: 康尔良; 卫爱平
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-11-25
Filing date: 2008-11-25
Publication date: 2009-08-19
Anticipated expiration: 2018-11-25

Abstract

The utility model relates to a testing power supply of a variable-frequency motor relating to a power supply which is capable of outputting two waveforms and is used for testing, and the power supply belongs to the manufacturing technical field of a motor testing system. The power supply aims at solving the problem that the testing power supply produced at present only has the single function of outputting an SPWM waveform or a sinusoidal wave waveform. The power supply comprises an SPWM generating circuit and an LC filtering segment, the SPWM generating circuit controls and outputs the SPWM waveform through connecting a first three-phase switch, and the SPWM output by the SPWM generating circuit controls and outputs the sinusoidal wave waveform after passing through the LC filtering segment. Therefore, the power supply can realize that one testing power supply has the function of outputting two waveforms, which satisfies the requirements of the motor testing.

Description

A kind of variable-frequency motor experiment power supply

Technical field

The utility model relates to a kind of electric source for test purposes with two kinds of waveforms of output, belongs to Motor Measuring System manufacturing technology field.

Background technology

Along with the development of power electronic technology and modern control theory, the motor test power supply also being developed towards the variable frequency power supply that is integrated in power electronic technology by original electric set electric supply form, is called the standing test power supply.Such power supply has the performance of electric set electric supply desired constant frequency pressure regulation and constant voltage frequency modulation when satisfying motor test, and by Filtering Processing, standing test electric power output voltage Harmonic Waves voltage factor satisfies the regulation of motor test standard.The standing test power supply is easier to realize Digital Control than the conventional rack operational mode, provides effective way for the solution generating set is difficult for satisfying some test requirements documents.

The variable-frequency motor test standard has stipulated that variable-frequency motor is when carrying out type approval test and delivery test, need be that SPWM and waveform are that correlation test is done in sinusoidal wave power supply by voltage waveform respectively in the several working points in the variable-frequency motor running frequency scope, but the only single function of the experimental power supply of producing at present with output SPWM waveform or sine waveform.

The utility model content

The purpose of this utility model is for the only single problem with function of output SPWM waveform or sine waveform of experimental power supply that solves present production, and a kind of variable-frequency motor experiment power supply is provided.

The utility model comprises the SPWM generative circuit and the first threephase switch KM1, it also comprises first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3, the first air core reactor L1, the second air core reactor L2, the 3rd air core reactor L3 and the second threephase switch KM2, three outputs of SPWM generative circuit link to each other with three inputs of the first threephase switch KM1 respectively, first output of SPWM generative circuit links to each other with the end of the first air core reactor L1, the other end of the first air core reactor L1 links to each other with first input of the second threephase switch KM2, second output of SPWM generative circuit links to each other with the end of the second air core reactor L2, the other end of the second air core reactor L2 links to each other with second input of the second threephase switch KM2, the 3rd output of SPWM generative circuit links to each other with the end of the 3rd air core reactor L3, the other end of the 3rd air core reactor L3 links to each other with the 3rd input of the second threephase switch KM2, first capacitor C 1, one end of second capacitor C 2 and the 3rd capacitor C 3 links together, the other end of first capacitor C 1 links to each other with the other end of the first air core reactor L1, the other end of second capacitor C 2 links to each other with the other end of the second air core reactor L2, and the other end of the 3rd capacitor C 3 links to each other with the other end of the 3rd air core reactor L3.

Advantage of the present utility model: simple in structure, realize that easily an experimental power supply can have the function of output SPWM waveform and sinusoidal wave two kinds of waveforms.

Description of drawings

Fig. 1 is the utility model structural representation.

Embodiment

Embodiment one: present embodiment is described below in conjunction with Fig. 1, present embodiment comprises the SPWM generative circuit 1 and the first threephase switch KM1, it is characterized in that it also comprises first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3, the first air core reactor L1, the second air core reactor L2, the 3rd air core reactor L3 and the second threephase switch KM2, three outputs of SPWM generative circuit 1 link to each other with three inputs of the first threephase switch KM1 respectively, first output of SPWM generative circuit 1 links to each other with the end of the first air core reactor L1, the other end of the first air core reactor L1 links to each other with first input of the second threephase switch KM2, second output of SPWM generative circuit 1 links to each other with the end of the second air core reactor L2, the other end of the second air core reactor L2 links to each other with second input of the second threephase switch KM2, the 3rd output of SPWM generative circuit 1 links to each other with the end of the 3rd air core reactor L3, the other end of the 3rd air core reactor L3 links to each other with the 3rd input of the second threephase switch KM2, first capacitor C 1, one end of second capacitor C 2 and the 3rd capacitor C 3 links together, the other end of first capacitor C 1 links to each other with the other end of the first air core reactor L1, the other end of second capacitor C 2 links to each other with the other end of the second air core reactor L2, and the other end of the 3rd capacitor C 3 links to each other with the other end of the 3rd air core reactor L3.

Realize the output of SPWM voltage by first threephase switch KM1 control, by the output of second threephase switch KM2 control sine voltage.

SPWM generative circuit 1 is an existing circuit that can generate the SPWM waveform, wherein transformer 2 has a dihedral and connects former limit, have two secondary---the second secondary 2-2 that the first secondary 2-1 of Y-connection is connected with dihedral, the first secondary 2-1 and the second secondary 2-2 connect the pulsation rectification circuit, the pulsation rectification circuit comprises 12 rectifier diodes, wherein R is a charging resistor, and switch CKM is a soft start switch.SPWM generative circuit 1 also comprises an inversion link, is made up of six IGBT devices, generates the SPWM waveform after inversion.

The LC filtering link that the SPWM waveform of SPWM generative circuit 1 output is formed through first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3, the first air core reactor L1, the second air core reactor L2 and the 3rd air core reactor L3 produces sinusoidal wave, when needing with sine wave, the second threephase switch KM2 that closes gets final product.

In order to satisfy the requirement of national standard, on the basis of original motor test, increase the carrier wave ratio adjustable function, to mate with different frequency converters with static power supply function to the variable-frequency motor test.

This motor test power supply can directly be exported the SPWM waveform of compound two different frequencies by control algolithm, be met frequency conversion through filtering and frequently test needed experimental condition, carry out the equivalent load method temperature rise test of asynchronous motor with asynchronous motor is folded.

Pulsation rectification link and inversion link can be equipped with low pressure, medium-pressure or high pressure device according to the electric pressure of test motor.

The carrier wave ratio adjustable function realizes by the carrier frequency of regulating pulse-width modulation process, before test according to the carrier frequency of standing test power supply being set with the supporting frequency converter carrier wave ratio parameter of variable-frequency motor.

Under the condition that capacity output allows, can close the simultaneously first threephase switch KM1 and the second threephase switch KM2 carry out SPWM output form and sinusoidal wave form no-load test respectively to two variable-frequency motors.

Under the prerequisite that variable-frequency motor has been started by rated voltage and rated frequency, after determining secondary frequency frequently, regulate pair voltage frequently according to the process of the test needs, so that reaching rated current, current of electric carries out temperature rise test.

Claims

1, a kind of variable-frequency motor experiment power supply, it comprises the SPWM generative circuit (1) and the first threephase switch KM1, it is characterized in that it also comprises first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3, the first air core reactor L1, the second air core reactor L2, the 3rd air core reactor L3 and the second threephase switch KM2, three outputs of SPWM generative circuit (1) link to each other with three inputs of the first threephase switch KM1 respectively, first output of SPWM generative circuit (1) links to each other with the end of the first air core reactor L1, the other end of the first air core reactor L1 links to each other with first input of the second threephase switch KM2, second output of SPWM generative circuit (1) links to each other with the end of the second air core reactor L2, the other end of the second air core reactor L2 links to each other with second input of the second threephase switch KM2, the 3rd output of SPWM generative circuit (1) links to each other with the end of the 3rd air core reactor L3, the other end of the 3rd air core reactor L3 links to each other with the 3rd input of the second threephase switch KM2, first capacitor C 1, one end of second capacitor C 2 and the 3rd capacitor C 3 links together, the other end of first capacitor C 1 links to each other with the other end of the first air core reactor L1, the other end of second capacitor C 2 links to each other with the other end of the second air core reactor L2, and the other end of the 3rd capacitor C 3 links to each other with the other end of the 3rd air core reactor L3.