CN101017118A - Test method for performance of high speed engine clutch - Google Patents

Abstract

This invention discloses one high speed motor clutch property test method, which adopts hall sensor to get impulse signals through frequency voltage into voltage signal and finally enters work control machine through AD, wherein, the torque measurement adopts indirect computation method.

Description

Test method for performance of high speed engine clutch

Technical field

The invention belongs to the engine clutch field in the electromechanical integration field, relate in particular to a kind of test method for performance of high speed engine clutch.

Background technology

Traditional test method for performance of high speed engine clutch is to adopt direct current generator to drive, and clutch coupling just can reach test speed after by the speed-increasing gear speedup; And the development of alternating frequency conversion technique makes ac speed control method be better than traditional method of passing through the speed-increasing gear speedup, and also low many of experimentation cost.The sensor price that is applicable to the detection of high speed rotating shaft moment of torsion at present is very high, and installs also very difficult.

Summary of the invention

The purpose of this invention is to provide a kind of test method for performance of high speed engine clutch, this test method with reduction experimentation cost, and improves the test control accuracy by measuring the torque value of clutch coupling indirectly.

In order to reach this purpose, test method for performance of high speed engine clutch of the present invention is characterized in that may further comprise the steps:

1, a kind of test method for performance of high speed engine clutch is characterized in that may further comprise the steps:

A, carry out running-in test, keep moment of torsion constant in this stage, clutch outer, rotated by inner ring motor-driven clutch coupling inner ring constant speed, stable operation makes the inner ring machine operation at motoring condition, makes new clutch coupling carry out running-in test;

B, carry out conjugation test,, the inner ring motor is risen by the rotating speed spectrum, make the outer ring motor be in the generating duty simultaneously and carry out moment of torsion and load, at this moment measure the electromagnetic torque T of inner ring motor by the inner ring frequency converter in this stage _e, calculate inner ring electric motor load torque T by formula I _L, calculate the outer ring by formula II again and load torque T _X:

$T_L=T_e-J\frac{\mathrm{d\ω}}{\mathrm{dt}}---\left(I\right)$

T _X＝T _L-T ₀ (II)；

Among the formula II, T ₀Be the torque of inner ring empty load of motor, this no-load torque is when the outer ring motor is not installed, and a series of values of measuring are stored in the array, uses when loading moment of torsion for dynamic calculation;

C, surmount test, the outage of inner ring motor is not worked, and outer ring motor-driven clutch outer rotating speed rises to predetermined value rapidly or in the given time and keeps constant-speed operation;

D, measure outer ring rotating speed of motor and inner ring rotating speed of motor by Hall element, Hall element is exported pulse and is transformed into voltage signal through pressure conversion frequently, enter industrial computer through the AD conversion, industrial computer carries out the closed loop pid algorithm by software, and controlled quentity controlled variable is exported to inner ring frequency converter and outer ring frequency converter through DA.

Adopt technique scheme, test method for performance of high speed engine clutch of the present invention has following characteristics:

(1) adopt driving of three-phase alternating current variable-frequency motor and loading, need not speed-increasing gear, the control accuracy height, cost is low;

(2) ac three-phase asynchronous motor is operated in generating state realization loading, and the control that loads size realizes by the method that changes synchronous rotational speed and then change revolutional slip;

(3) moment of torsion detects and adopts the mode of conversion indirectly, does not need torque sensor;

(4) rotational speed governor is realized by software in the industrial computer, the control accuracy height

Description of drawings

Below in conjunction with the drawings and specific embodiments, the present invention is described in detail:

Fig. 1 is a closed loop schematic diagram of the present invention.

Embodiment

As shown in Figure 1, inner ring motor and outer ring motor are according to being come type selecting by the rotating speed of test specimen and loaded load, and corresponding inner ring frequency converter and outer ring frequency converter then come type selecting according to the rated power and the rated speed of inner ring motor and outer ring motor.Rotating speed detects and adopts Hall element and the pulse that the magnetic patch induction that is installed on the machine shaft produces to measure, and will be transformed into voltage signal after the shaping pulse frequency multiplication earlier, and conversion enters industrial computer through AD.

Switch among Fig. 1 is controlled by software instruction, moment of torsion control closed loop work when break-in and conjugation test, and outer ring motor speed closed-loop control work when surmounting test, closed loop control algorithm adopts modified PID control.

Earlier switch is switched to break-in, conjugation test, carries out following running-in test and conjugation test:

A, carry out running-in test, keep moment of torsion constant in this stage, clutch outer, rotated by inner ring motor-driven clutch coupling inner ring constant speed, stable operation makes the inner ring machine operation at motoring condition, makes new clutch coupling carry out running-in test;

B, carry out conjugation test, in this stage, the inner ring motor is risen by the rotating speed spectrum, the outer ring machine operation is carried out moment of torsion at generating state and is loaded simultaneously, is at this moment measured the electromagnetic torque T of inner ring motor by the inner ring frequency converter _e, calculate inner ring electric motor load torque T by formula I _L,

$T_L=T_e-J\frac{\mathrm{d\ω}}{\mathrm{dt}}---\left(I\right)$

Calculate the outer ring by formula II then and load torque T _X, the outer ring locked-in torque equals the inner ring electric motor load torque and deducts the torque of inner ring empty load of motor, that is:

T _X＝T _L-T ₀ (II)；

Among the formula II, T _XFor the outer ring loads moment of torsion, T ₀Be the torque of inner ring empty load of motor, the torque of inner ring empty load of motor is measured a series of value under the different rotating speeds when the outer ring motor is not installed, is stored in the array, uses when loading moment of torsion for dynamic calculation.

Again switch is switched to and surmounts test:

C, surmount test, the outage of inner ring motor is not worked, and outer ring motor-driven clutch outer rotating speed rises to predetermined value and keeps constant-speed operation;

D, measure outer ring rotating speed of motor and inner ring rotating speed of motor by Hall element, Hall element is exported pulse and is transformed into voltage signal through pressure conversion frequently, enter industrial computer through the AD conversion, industrial computer carries out the closed loop pid algorithm by software, and controlled quentity controlled variable is exported to inner ring frequency converter and outer ring frequency converter through DA.

The rotor speed of outer ring motor is during greater than synchronous rotational speed, and machine operation produces retarding torque at generating state, and the big or small transfer rate of torque relevant (this moment, revolutional slip was less than 0) is shown below:

$T=K_T^{\′}\frac{s{R}_2{U}_1^2}{R_2^2+{\left(s{X}_{\mathrm{\σ}20}\right)}^2}$

K wherein _T' all be with the relevant constant of motor configuration; R2 is a rotor resistance, X _{σ 20}Be the every phase leakage reactance of rotor; U1 is every phase voltage effective value.Revolutional slip is at-s _mIn the time of between～0, torque is a monotonically increasing with the variation of revolutional slip, and approaches linear increasing, and can realize by the method that changes revolutional slip loading the control of moment of torsion.Specifically, realize control by changing synchronous rotational speed to revolutional slip.

The controller of this device is core with the industrial computer, adopts the multifunctional data acquisition card PCL812-PG that grinds magnificent company to realize AD and DA function.Control Software adopts C++Builder software programming under the Windows environment.

By above introduction to test method for performance of high speed engine clutch of the present invention, the present invention has following characteristics as can be seen:

(1) adopt driving of three-phase alternating current variable-frequency motor and loading, need not speed-increasing gear, the control accuracy height, cost is low;

(2) ac three-phase asynchronous motor is operated in generating state realization loading, and the control that loads size realizes by the method that changes synchronous rotational speed and then change revolutional slip;

(3) moment of torsion detects and adopts the mode of conversion indirectly, does not need torque sensor;

(4) rotational speed governor is realized by software in the industrial computer, the control accuracy height.

Claims (1)

1, a kind of test method for performance of high speed engine clutch is characterized in that may further comprise the steps:

A, carry out running-in test, keep moment of torsion constant in this stage, clutch outer, rotated by inner ring motor-driven clutch coupling inner ring constant speed, stable operation makes the inner ring machine operation at motoring condition, makes new clutch coupling carry out running-in test;

B, carry out conjugation test,, the inner ring motor is risen by the rotating speed spectrum, make the outer ring motor be in the generating duty simultaneously and carry out moment of torsion and load, at this moment measure the electromagnetic torque T of inner ring motor by the inner ring frequency converter in this stage _e, calculate inner ring electric motor load torque T by formula I _L, calculate the outer ring by formula II again and load torque T _X:

$T_L=T_e-J\frac{\mathrm{d\ω}}{\mathrm{dt}}---\left(I\right)$

T _X＝T _L-T ₀ (II)；

Among the formula II, T ₀Be the torque of inner ring empty load of motor, this no-load torque is when the outer ring motor is not installed, and a series of values of measuring are stored in the array, uses when loading moment of torsion for dynamic calculation;

C, surmount test, the outage of inner ring motor is not worked, and outer ring motor-driven clutch outer rotating speed rises to predetermined value rapidly or in the given time and keeps constant-speed operation;

D, measure outer ring rotating speed of motor and inner ring rotating speed of motor by Hall element, Hall element is exported pulse and is transformed into voltage signal through pressure conversion frequently, enter industrial computer through the AD conversion, industrial computer carries out the closed loop pid algorithm by software, and controlled quentity controlled variable is exported to inner ring frequency converter and outer ring frequency converter through DA.

Images