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Feature Point Position Angle Detection Method for Optimizing Switched Reluctance Motor Control Strategies

A switched reluctance motor and control strategy technology, applied in the direction of single motor speed/torque control, electronic commutator, etc., can solve problems such as accuracy errors, and achieve the effect of improving efficiency

Active Publication Date: 2020-07-28
杭州小爻科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0037] It is also necessary to emphasize here: due to the switchability caused by the doubly salient pole structure of the SR motor, the non-linearity caused by the constant operation of the magnetic circuit saturation state, for this reason, the accurate analytical calculation of the physical quantities of the motor needs to go through complex nonlinear Modeling to analyze, this can only be done with the help of computer finite element simulation analysis
Therefore, although the linear model of the SR motor used for qualitative analysis above can show the basic electromagnetic relationship and basic characteristics inside the SR motor, there is still a certain error in terms of relative accuracy.

Method used

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  • Feature Point Position Angle Detection Method for Optimizing Switched Reluctance Motor Control Strategies
  • Feature Point Position Angle Detection Method for Optimizing Switched Reluctance Motor Control Strategies
  • Feature Point Position Angle Detection Method for Optimizing Switched Reluctance Motor Control Strategies

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Experimental program
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Embodiment 1

[0059] Embodiment 1 code disc scheme 1:

[0060] refer to image 3 , the scheme consists of three layers of feature point arc grooves combined with a layer of transparent and light-blocking layers separated by 9°. The first layer of feature point arc grooves is detected by five optocouplers A, B, C, D, and E, the second and third layer of feature point arc grooves are detected by optocoupler 1 and 2 respectively, and another layer is added with a distance of 9° The light-transmitting and light-shielding layers are detected by the optocoupler 3 for distinguishing the state values ​​of feature points. According to the radius of the outer rotor of the motor is 173mm, the radius of the code disc is also R173mm. Here, the center points of the photocouplers A, B, C, D, and E are located at the arc radius R160mm, respectively at the center of the salient poles of each phase. That is, the distance between the optocouplers of each phase is the stator pole pitch angle of 36°, and the ...

Embodiment 2

[0082] Embodiment 2 code disc scheme 2

[0083] refer to Figure 4 , the solution is to set the feature points as narrow slots, and then combine three layers of light-transmitting arc slots for testing. Since the code disc is set as a narrow slit at the feature point for detection, the measured optocoupler only outputs a 1 state when it is at the slit of the feature point, and the rest are 0 states. For this reason, it is necessary to add three layers of circular arc grooves for the light-transmitting and light-blocking poles, and use three optocouplers to distinguish the characteristic points of each phase. For the feature point narrow slit detection layer located at the radius R161mm, five optocouplers A, B, C, D, and E are used for detection, and they are respectively aligned with the centerlines of the salient poles of the stators of each phase, that is, the distance between the optocouplers of each phase is the same as that of the stator The polar distance angle is 36°,...

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Abstract

Disclosed is a characteristic point position angle detection method for optimizing a control strategy of a switch reluctance motor. The characteristic point position angle, namely a motor magnetic circuit structure determined by the mutual position relation between salient poles of a stator and a rotor, also represents a changing relation of each phase of winding inductor along with overlapping of the salient poles of the stator and the rotor; the phase distance of each characteristic point position angle is related to the structural parameters of a controlled motor; and each characteristic point position angle, in which each phase of the winding inductor is changed along with the changes of the overlapped spacings between the salient poles of the stator and the rotor, is detected. The characteristic point position angle detection can adopt a software indirect detection method as well as a hardware direct detection method; and the hardware direct detection method adopts a coded disc and performs detection though an optical coupler. By virtue of the characteristic point position angle detection method, the control strategy of the switch reluctance motor is improved effectively; and the switch-on angle theta<on> and the switch-off angle theta<off> of each phase are adjusted in time according to the characteristic point position angle to adapt load characteristic matching of variable working conditions at any time, so as to improve efficiency in each operating working condition and realize maximum energy conservation.

Description

technical field [0001] The invention belongs to the field of switched reluctance motors, and in particular relates to a control strategy of a switched reluctance motor and a position angle detection method thereof. Background technique [0002] The biggest advantage of the switched reluctance SR motor is that it can adjust the opening angle θ on and turn-off angle θ off To adapt to its changes at any time to improve the efficiency of each operating condition. Therefore, it is especially suitable for loads with variable working conditions, such as the drive of electric vehicles. The switched reluctance motor drive SRD system adopts a double closed-loop control of the outer loop of the speed and the inner loop of the current. That is, according to the measured speed and current feedback information, it is necessary to reasonably and effectively adjust the opening angle θ according to the corresponding control strategy on and turn-off angle θ off , so that the output torqu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/18H02P6/08
CPCH02P6/08H02P6/18
Inventor 王金懿蒋伟陈捷雷王贵明
Owner 杭州小爻科技有限责任公司