CN2526813Y - Device for detecting average torque of switch magnetic resistance motor using winding average current - Google Patents

Abstract

The utility model provides a device which utilizes the average current of a winding to detect the average torque of a switch magnetic reluctance motor. The utility model is mainly characterized in that the device comprises one or a plurality of current detectors used for one-phase or multi-phase winding current detection, an adder used for adding the detected multi-phase current signals up and a signal averager used for finding out the mean value of current signals. The motor is a one-phase or a multi-phase motor, a rotor of the motor adopts an inner rotor or an outer rotor structure. A service power circuit of the winding is a double power supply circuit, a biswitch circuit or a duplex winding circuit. The current detector is connected first with the adder, then the back of the adder is connected with the signal averager; or the back of the current detector is connected with the signal averager first, then the back of the signal averager is connected with the adder. The device is relatively simple in structure and easy to be used and manufactured with certain accuracy at the meantime. The utility model can be used for controlling the torque of the switch magnetic reluctance motor and constituting a corresponding adjustment device.

Description

Utilize the device of the average torque of winding average current detection switched reluctance motor

The pick-up unit of a kind of switched reluctance motor (following abbreviation motor) average torque is mainly used in SRD (being called for short SRD down) and relevant control system thereof.

As a kind of novel continuous speed regulation system, SRD has very application fields and application prospect.In order to improve its performance index, when constituting SRD and relevant control system thereof, often need to detect the average torque of motor.Because torque is mechanical quantity, when constituting various utility system its directly to detect general difficulty big.

Task of the present utility model provides a kind of simple and easy to do, and can keep the indirect detection device of the motor average torque of certain precision.Promptly pass through the average torque of the average current indirect detection motor of detection motor one phase or polyphase windings, and can realize SRD and relevant control system thereof whereby.

Below in conjunction with accompanying drawing the utility model is described in further detail.

Fig. 1 is the electric motor structure synoptic diagram.

Fig. 2 is three kinds of prime power circuit diagrams of SRD.

Fig. 3 is for adopting the winding current synoptic diagram under three kinds of control modes.

Fig. 4 is the relation of winding average current and motor average torque.

The electrical block diagram that Fig. 5 is polyphase windings current sample, addition, be averaged.

SRD is made up of motor, power circuit, control circuit and sensor etc.

Motor is a rotor biconvex electrode structure, and different numbers of poles, the different number of phases (being generally 1～5 phase) and inside and outside rotor structure pattern specifically can be arranged, and Fig. 1 is three-phase 6/4 a dynamo-electric motivation synoptic diagram.The motor winding is powered by power circuit, and Fig. 2 has represented that three kinds of basic circuit patterns (only having represented 1 circuitry phase among the figure): Fig. 2 (a) is the double winding circuit for two-supply circuit, Fig. 2 (b) for biswitch circuit, Fig. 2 (c).The motor winding current is the unidirectional pulse electric current, and current waveform is with the control mode difference that is adopted, also with rotating speed and load variations.Fig. 3 (a) and (b), (c) are respectively the basic winding current waveform (annotate: to the double winding circuit, this electric current is main, pair winding current sum) that adopts under monopulse, current chopping (electric current PWM), voltage chopping (voltage pwm) control mode.

Get a phase winding current average $\stackrel{\&OverBar;}{i}={\&Integral;}_0^T\mathrm{idt}$ , or N phase motor got n phase winding current average $n\stackrel{\&OverBar;}{i}={\&Integral;}_0^T({\mathrm{<figure-callout\; id="1"\; label="i"\; filenames="Y0127874400072.png"\; state="\{\{state\}\}">i</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="i"\; filenames="Y0127874400061.png,Y0127874400062.png"\; state="\{\{state\}\}">i</figure-callout>}}_2+\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;+i_n)\mathrm{dt}$ , n≤N, it is with having the favorable linearity corresponding relation between motor average torque Te, as shown in Figure 4.When having determined average torque ratings (Te) _HWith average current rating (i) _HAfter, just can calculate average torque according to the average current that detects: $\stackrel{\&OverBar;}{T}e=\stackrel{\&OverBar;}{i}\frac{{\left(\stackrel{\&OverBar;}{T}e\right)}_H}{{\left(\stackrel{\&OverBar;}{i}\right)}_H},$ Or $\stackrel{\&OverBar;}{T}e=n\stackrel{\&OverBar;}{i}\frac{{\left(\stackrel{\&OverBar;}{T}e\right)}_H}{n{\left(\stackrel{\&OverBar;}{i}\right)}_H}.$ 。

Hence one can see that, realizes that the device of above-mentioned average torque detection is made up of links such as winding current detecting device, polyphase windings current signal totalizer and current signal averagers.

The detection link of winding current i can be obtained by the pressure drop of the resistor of string in winding loop, also can detect by the various current sensors (as current sensor, the mutual inductor based on principles such as Hall unit, linear optical coupling, isolated amplifier, electromagnetic induction) that are installed in winding loop.

Ask average link can pass through to simulate passive, active filter circuit processing to the survey winding current, also can be by the numerical operation acquisition of numerical value sampling back.The addition link of polyphase windings electric current can be finished by analog addition circuit or numerical operation.Addition again after can asking on average earlier to the polyphase windings electric current also can first addition ask average.

Figure 5 shows that each winding current detection of threephase motor, addition, ask the equilibration device synoptic diagram.Three phase winding A of motor (1), B, C are by power circuit (2) power supply.Utilize the current i in current sensor (3) detection three phase windings _A, i _B, i _C, and pass through analog adder (4) with three-phase current signal addition (i _A+ i _B+ i _C), obtain the mean value of three-phase winding current at last by rc filter circuit (5) $n\stackrel{\&OverBar;}{i}={\&Integral;}_0^T(i_A+i_B+i_C)\mathrm{dt}$

Utilize detected motor current, realize various relevant torque control easily, as constituting rotating speed-current double closed-loop system, torque modulation system, torque (or power) synchro system etc. to SRD.

Claims (8)

1. device that utilizes the average torque of winding average current detection switched reluctance motor is characterized in that: described device has and one or morely is used to detect 1 mutually or the current detectors of polyphase windings electric current; Described device has a totalizer that is used for the addition of detected polyphase windings current signal; Described device has one to be used for signal averager that current signal is averaged.

2. device according to claim 1 is characterized in that: described motor is 1 phase or polyphase motor; Its rotor structure is inner rotor core, outer-rotor structure; The output power circuit of its winding is two-supply circuit, biswitch circuit or double winding circuit.

3. device according to claim 1 is characterized in that: described current detector for the string in winding loop resistor, be installed in the current sensor in the winding loop.

4. device according to claim 3 is characterized in that: described current sensor is Hall unit, linear light idol, isolated amplifier, type electromagnetic induction current sensor, mutual inductor.

5. device according to claim 1 is characterized in that: described totalizer is analog addition circuit, numerical value sampling computing circuit.

6. device according to claim 1 is characterized in that: described signal averager is simulation passive electric circuit, analogue active circuit, numerical value sampling computing circuit.

7. device according to claim 1 is characterized in that: described current detector connects totalizer, connects signal averager in the back of described totalizer.

8. device according to claim 1 is characterized in that: described current detector connects signal averager, connects totalizer in the back of described signal averager.

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