A Method of Initial Position Estimation for Switched Reluctance Motor Based on Time Threshold
A switched reluctance motor, initial position technology, applied in AC motor control, estimation/correction of motor parameters, electrical components, etc., can solve the problems of slow change of inductance, reversal, catastrophic consequences, etc., to achieve a simple algorithm , Universal effect
Inactive Publication Date: 2018-04-10
NANJING XIAOZHUANG UNIV
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[0003] In order to realize the application of position sensorless technology, the judgment of the initial position is the premise and condition, especially in some specific occasions, such as electric vehicles, precision servo transmission and other fields, the motor is not allowed to reverse, so it is necessary to use the sensorless sensor in these fields. For position sensor technology, it is necessary to consider the precise estimation of the initial position angle and the judgment of the initial conduction phase. If the accurate initial position estimation cannot be realized, the motor will reverse, which will lead to catastrophic consequences.
Scholars at home and abroad have studied many methods for the estimation and judgment of the initial position of the switched reluctance motor, such as the pulse injection method and the inductance partition method. In a large area, the initial position estimation accuracy is not high due to the small difference in the amplitude of the pulse current
In the inductance partition method, the inductance of the maximum and minimum inductance areas changes slowly, so the phase current of the motor in this area also changes slowly, which has a great impact on the accuracy of the phase current collected by the current sensor, and ultimately leads to low accuracy of the initial position estimation. Inversion will occur. In a word, each initial position estimation method has its advantages and disadvantages. Therefore, it is necessary to overcome the defects of the prior art, solve the problems of accurately estimating the rotor initial position angle and judging the initial starting phase, so as to improve the position sensorless Operation Stability of Switched Magnetic Group Motor System
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[0023] Such as figure 1 As shown, the method for estimating the initial position of the switched reluctance motor based on the time threshold provided by the present invention includes the following steps:
[0024] Step 1. Set the initial value ΔI of the change amount of the current rise of each phase. This value is a fixed value to ensure that the change amount of the current rise of each phase is equal, and the electric cycle of the phase inductance curve is divided according to the average partition method, so that each The phase inductance curve in each partition is a monotone function;
[0025] Step 2, at t 0 At the same time, the switching tubes on each phase winding of the motor are sent a turn-on signal to turn on the phase winding, so that the phase current i changes from the initial i 0 start rising, starting i 0 size is zero;
[0026] Step 3, use the signal acquisition unit to detect the magnitude of the phase current i of each phase in real time, and then use t...
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The invention discloses a time threshold-based initial position estimation method of a switched reluctance motor, and belongs to the technical field of control on switched reluctance motors. The method comprises an initialization setting step, an inductance cycle average partition method, a phase current rising variation calculation and judgment step, a phase current rising time variation calculation and judgment step, a position judgment step and the like. According to the time threshold-based initial position estimation method of the switched reluctance motor disclosed by the invention, the initial position of a motor rotor can be effectively estimated; hardware does not need to be added; and the universality is high.
Description
technical field [0001] The invention relates to a method for estimating the initial position of a switched reluctance motor, in particular to a method for estimating the initial position of a switched reluctance motor based on a time threshold. Background technique [0002] In the application field, the switched reluctance motor needs the rotor position signal. At present, the rotor position signal is mainly obtained by the direct position detection method. This method is to add a position sensor to the motor to obtain the position signal. Typical examples include electromagnetic type and photoelectric type. , magnetosensitive, etc., among which photoelectric sensors are the most widely used, but these traditional mechanical sensors have complex structures and are inconvenient to install, which not only increases the complexity of the system structure, but also reduces the reliability of the system and increases the cost, restricting the Switched reluctance motors are widely...
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IPC IPC(8): H02P25/08H02P23/14
CPCH02P23/14H02P25/08
Inventor张磊俞跃
OwnerNANJING XIAOZHUANG UNIV