CN203414576U - Dynamic load apparatus for testing variable frequency motor - Google Patents
Dynamic load apparatus for testing variable frequency motor Download PDFInfo
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- CN203414576U CN203414576U CN201320180613.9U CN201320180613U CN203414576U CN 203414576 U CN203414576 U CN 203414576U CN 201320180613 U CN201320180613 U CN 201320180613U CN 203414576 U CN203414576 U CN 203414576U
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- torque
- asynchronous machine
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Abstract
The utility model provides a dynamic load apparatus for testing a variable frequency motor. The dynamic load apparatus is characterized by including an asynchronous motor performs as an accompany test motor, the asynchronous motor is coaxially connected with the motor to be tested, a rotating speed sensor is connected with the shared shaft of the asynchronous motor and the motor to be tested, the rotating speed sensor is connected with a controller, the controller controls a frequency converter, and the frequency converter outputs voltage and frequency signals to the asynchronous motor. According to the dynamic load apparatus, different types of loads are simulated, the variable frequency motor can be loaded with different types of loads for dynamic performance test according to purposes, for example, an acceleration performance test, a deceleration performance test and a start performance test are available, and the dynamic performance test of the variable frequency motor is guaranteed with completely real loads.
Description
Technical field
The utility model relates to a kind of load simulating device of variable-frequency motor, simulates the load of different torque types, belongs to Motor Measuring System field.
Background technology
Because the dynamic operation of variable-frequency motor is generally bringing onto load state, so Dynamic performance examination of variable-frequency motor, not only to test the unloaded dynamic property of variable-frequency motor, the more important thing is the load dynamic property of test variable-frequency motor, loadtype is numerous, therefore must, to fictitious load at the trial, could really test out the dynamic property of variable-frequency motor under real load.
Common loadtype has 4 kinds: permanent power, permanent torque, asquare torque and linear load, and in practical application, travelling belt, stirring machine, hoister etc. belong to constant torque load; Machine tool chief axis, milling train, up-coiler etc. belong to constant power load; Blower fan, water pump etc. belong to asquare torque load; Wire drawing machine, weaving loom etc. belong to linear load.
In different application occasion, the relational expression between load torque and rotating speed is T
l=K * n
m, wherein, T
lfor load torque; K is load factor; N is load speed.As shown in Figure 1, in Fig. 1, curve A is constant power load to torque one speed curves of Four types load, now, m=-1, in speed adjustable range, power invariability, load torque and the rotating speed relation that is inversely proportional to; Curve B is constant torque load, now, m=0, in speed adjustable range, load torque holding torque is constant; Curve C is linear load, now, m=1, in speed adjustable range, load torque is linear increasing with the increase of rotating speed; Curve D is asquare torque load, now, m=2, in speed adjustable range, load torque becomes square to increase progressively relation with rotating speed.
As shown in Figure 2, it can only set the load performance test that single torque type is carried out variable-frequency motor to existing variable-frequency motor load test system.In order to meet the variable-frequency motor Dynamic performance examination requirement of different occasions, Motor-Testing System must testing of electric motors dynamic performance testing under different loads, thereby the load while how to simulate different torque type dynamic operation becomes the problem that test macro must solve.
Summary of the invention
An object of the present utility model is to provide a kind of load equipment of the load dynamic performance testing for variable-frequency motor, is guaranteeing under the prerequisite of its test capability, and the load that can simulate different torque types, improves system performance.
In order to achieve the above object, the technical solution of the utility model has been to provide a kind of variable-frequency motor test dynamic load device, it is characterized in that, comprise as the asynchronous machine of accompanying examination motor, asynchronous machine is connected with tested motor coaxle, speed probe is connected on asynchronous machine and the common axle of tested motor, speed probe connects controller, controller is controlled frequency converter, frequency converter is according to rotating speed size and load properties, the load torque size that should provide under this rotating speed is provided, by the real-time calculating voltage of DSP and frequency, and control in real time voltage and the frequency values of asynchronous machine.
The utility model can be simulated different loadtypes, make the variable-frequency motor at the trial can be according to purposes, load dissimilar load and carry out Dynamic performance examination, such as acceleration test, decelerability test, startability test etc., guarantee that the dynamic performance testing of variable-frequency motor carries out completely in actual loading situation.
Accompanying drawing explanation
Fig. 1 is torque one speed curves of Four types load;
Fig. 2 is existing variable-frequency motor load test system schematic diagram;
Fig. 3 is the variable-frequency motor test that adopts the utility model and the provide variable-frequency motor load test system schematic diagram with dynamic load device;
Fig. 4 is load characteristic test flow chart of the present utility model;
The torque-speed characteristic of asynchronous machine when Fig. 5 is converting operation;
Fig. 6 is asynchronous machine load regulation curve.
Embodiment
For the utility model is become apparent, hereby with preferred embodiment, and coordinate accompanying drawing to be described in detail below.
As shown in Figure 3, a kind of variable-frequency motor test that the utility model provides adopts the method for controlling torque based on accompanying examination motor with dynamic load device, according to the mathematical model of dissimilar load, correspondingly regulate voltage and the frequency of accompanying examination motor, reach simulation unequally loaded object, it specifically comprises:
Asynchronous machine, adopts asynchronous machine in the present embodiment, is connected with tested motor coaxle, adopts voltage/frequency control model, for simulating the torque characteristics of different loads type;
Speed probe, is connected on the axle of asynchronous machine and tested motor, for obtaining the rotating speed of asynchronous machine and tested motor;
Controller, adopts special-purpose 32 the control chip DSP of asynchronous motor drive in the present embodiment, fast operation, and true-time operation is strong.According to the rotary speed information obtaining from speed probe, according to the corresponding torque-speed relation of current loadtype, obtain making asynchronous machine output torque needed voltage and the frequency corresponding with this rotating speed, control frequency converter and export this voltage and frequency to asynchronous machine.
The utility model also provides a kind of load simulation method of dynamic load device for above-mentioned variable-frequency motor test that adopts, and the steps include:
The first step, controller obtain the rotation speed n of asynchronous machine by speed probe, by formula T
l=K * n
mcalculate the load torque T of required simulation
l, wherein, K is load factor, when the load of required simulation is constant power load, m=-1, when the load of required simulation is constant torque load, m=0, when the load of required simulation is asquare torque load, m=1, when the load of required simulation is linear load, m=2:
Second step, the torque-speed curve according to asynchronous machine when the different frequency are asked for and present load torque T
land the corresponding frequency f of rotation speed n.The torque-speed characteristic of asynchronous machine when Fig. 5 is converting operation, in the drawings, f
1to f
5for the different running frequencies of asynchronous machine, just Fig. 5 is combined and can obtain Fig. 6 with Fig. 1, as long as obtained load torque T
land rotation speed n, just can in Fig. 6, find out and the corresponding frequency f of current type load.Basis again
calculate voltage U, wherein, T=T
l, the number of pole-pairs that P is asynchronous machine, thus the load torque T with current type obtained
lcorresponding a pair of frequency f and voltage U.Certainly those skilled in the art also can carry out many group tests in advance, obtain the corresponding different loads torque of different rotating speeds n T
lagain according to loadtype, obtain needed different frequency f and the voltage U of the asynchronous machine of specific model, finally set up one for the asynchronous machine of specific model, for simulating dissimilar load, the corresponding table of different rotating speeds n and different frequency f and voltage U, when actual motion, only needs to set the rotation speed n that needs the loadtype of simulation and obtain asynchronous machine and just can table look-up and obtain corresponding frequency f and voltage U.
The 3rd step, controller are controlled frequency converter to asynchronous machine output voltage U and frequency f, and making asynchronous machine simulation torque is T
lconstant power load or constant torque load or asquare torque load or linear load.
The variable-frequency motor test that the utility model provides is according to the characteristic of accompanying examination motor with many torques type rapid response type test load, directly set up mathematical model, obtain torque and voltage, electric current, rotating speed, generated output, the isoparametric relation of frequency, by calculating, quick adjustment is accompanied frequency and the voltage parameter of examination motor, reaches and regulates by test-run a machine torque and regulate tested motor torque by the effect of certain Changing Pattern variation.
Certainly, above-mentioned calculating is theoretical calculating, and each point magnitude of voltage during actual motion is according to real electrical machinery characteristic, and the torque calculation result to motor, revises voltage, frequency values, and the load torque that can obtain setting is arbitrarily controlled curve.
As shown in Figure 5, the concrete steps that the load simulation method that adopts the utility model to provide carries out load characteristic test are: first enter load testing program, test parameter (nominal torque, accompany examination the parameter of electric machine) is arranged, load motor calculates the load torque under this rotating speed according to detecting the rotating speed coming, according to the load torque calculating and voltage and the frequency of accompanying the property calculation motor of examination motor, voltage and frequency that the output of programmed control frequency converter calculates, so looping calculating can control, until obtain parking order.
The acceleration and deceleration performance of variable-frequency motor and startability are as an important technology index of variable-frequency motor, for variable-frequency motor, carry out associated dynamic test significant, therefore load simulation test during different torque type dynamic operation, to improving variable-frequency motor performance, reduce variable-frequency motor loss, refinement variable-frequency motor classification design, improves the quality of products and has major and immediate significance.
Claims (1)
1. a variable-frequency motor is tested and is used dynamic load device, it is characterized in that, comprise as the asynchronous machine of accompanying examination motor, asynchronous machine is connected with tested motor coaxle, speed probe is connected on asynchronous machine and the common axle of tested motor, speed probe connects controller, controller is controlled frequency converter, frequency converter is according to rotating speed size and load properties, the load torque size that should provide under this rotating speed is provided, by the real-time calculating voltage of DSP and frequency, and control in real time voltage and the frequency values of asynchronous machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320180613.9U CN203414576U (en) | 2013-04-11 | 2013-04-11 | Dynamic load apparatus for testing variable frequency motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320180613.9U CN203414576U (en) | 2013-04-11 | 2013-04-11 | Dynamic load apparatus for testing variable frequency motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203414576U true CN203414576U (en) | 2014-01-29 |
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ID=49977458
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320180613.9U Expired - Lifetime CN203414576U (en) | 2013-04-11 | 2013-04-11 | Dynamic load apparatus for testing variable frequency motor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983918A (en) * | 2014-04-23 | 2014-08-13 | 清华大学 | Method for physical simulation of transient state and dynamic state of power live load in power system |
| CN112408127A (en) * | 2020-11-17 | 2021-02-26 | 上海吉亿电机有限公司 | Simulation test device and method for elevator driving system |
| CN112649729A (en) * | 2020-11-26 | 2021-04-13 | 天地（常州）自动化股份有限公司 | Test system and test method for comprehensively evaluating control performance of frequency converter |
-
2013
- 2013-04-11 CN CN201320180613.9U patent/CN203414576U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983918A (en) * | 2014-04-23 | 2014-08-13 | 清华大学 | Method for physical simulation of transient state and dynamic state of power live load in power system |
| CN112408127A (en) * | 2020-11-17 | 2021-02-26 | 上海吉亿电机有限公司 | Simulation test device and method for elevator driving system |
| CN112408127B (en) * | 2020-11-17 | 2022-09-02 | 上海吉亿电机有限公司 | Simulation test device and method for elevator driving system |
| CN112649729A (en) * | 2020-11-26 | 2021-04-13 | 天地（常州）自动化股份有限公司 | Test system and test method for comprehensively evaluating control performance of frequency converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140129 |
|
| CX01 | Expiry of patent term |