A position sensorless control method for switched reluctance motor based on phase current slope difference method
A technology of switched reluctance motor and control method, which is applied in the direction of electronically commutated motor control, AC motor control, control system, etc., can solve the problems of inaccurate sampling values, etc., and achieve the elimination of winding voltage drop, improve system efficiency, and measure accuracy high effect
Active Publication Date: 2022-01-04
DALIAN UNIV OF TECH
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The invention simplifies the current sampling and data processing process of the traditional phase current slope difference method, and avoids the problem of inaccurate sampling values affected by current fluctuations. The current sensor and the amplifier have zero offset and the influence of the gain error on the sampling value, and the position detection accuracy is improved. The invention is applicable to different switched reluctance motors, and expands the application range of the simplified phase current slope difference method, and has universal application sex
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Embodiment 1
[0053] Example 1: Take a 12 / 8 pole, 2200r / min, 4.5kW switched reluctance motor as a prototype, the rated voltage is 60V, the injected voltage pulse frequency is 10kHz, the duty ratio is 1 / 9, and the current sensor adopts 50A / 5V closed-loop Hall current sensor, the output of which is amplified 5.7 times by the operational amplifier and then connected to the AD conversion pin of the microcontroller.
[0054] The specific embodiment of the present invention is as figure 1 As shown, the main program is executed once every 0.1ms, where the pulse injection time is 1 / 9 of the main loop period, and the current sampling time is 1 / 36 of the main loop period, and four current sampling values can be obtained in the current rising interval. Take the last two sampling values as the difference to calculate the current rising slope. According to the manuals of switching tubes and freewheeling diodes in the laboratory, their conduction voltage drop range is 1.75-2.1V, and 2V is taken here...
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The invention relates to a position sensorless control method of a switched reluctance motor based on a phase current slope difference method, which belongs to the field of switched reluctance motors. Through the theoretical analysis of the transient process of the rising and falling of the non-conducting phase current, the ratio relationship between the rising and falling slopes of the current is obtained, and combined with the real-time detection of the rotational speed comparison value for periodic adjustment, through multi-point sampling of the current rising slope , and then obtain the non-conducting phase current slope difference. The invention simplifies the current sampling and data processing process of the traditional phase current slope difference method, avoids the problem of inaccurate sampling values caused by current fluctuations in the current falling interval, and performs multi-point sampling calculation on the current rising interval with better linearity The slope overcomes the influence of the zero offset of the current sensor and the amplifier and the influence of the gain error on the sampling value, and improves the position detection accuracy. The present invention is applicable to different switched reluctance motors, and expands the scope of use of the simplified phase current slope difference method. It is universal.
Description
technical field [0001] The invention belongs to the field of switched reluctance motors, in particular to a position sensorless control method of a switched reluctance motor based on a phase current slope difference method. Background technique [0002] The switched reluctance motor must rely on the accurate rotor position to achieve closed-loop control. At present, mechanical position sensors such as photoelectric or magnetic sensors are generally used to detect the rotor position. However, in an environment with a lot of oil and dust, the detection element of the photoelectric position sensor is very easy to malfunction, resulting in an error in the position signal; the detection element of the magnetic sensitive position sensor is extremely susceptible to interference from magnetic dust and high-frequency electromagnetic fields and fails; In a high temperature environment, the detection element is easily damaged and fails. The existence of mechanical position sensors red...
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IPC IPC(8): H02P25/089H02P6/185
CPCH02P25/089H02P6/185
Inventor 孙建忠王连晟白凤仙
Owner DALIAN UNIV OF TECH