Abstract
When the switched reluctance motor is running, as the motor phase current increases, the magnetic circuit of the motor will gradually saturate, which affects the estimation of the special position of the motor rotor. Aiming at the above problems, this paper proposes a positionless control method for switched reluctance motors under the condition of magnetic field saturation. Firstly, the Fourier phase inductance function of switched reluctance motor is established, and then the component of Fourier phase inductance function affected by magnetic field saturation is eliminated mathematically. Research the method of estimating the position and angle of the rotor based on the inductance positioning point. This paper takes a 12\8 motor as an example to verify the effectiveness of the method by simulation.
Highlights
Switched reluctance motor phase inductance functionAccording to the method of determining the rotor position of the switched reluctance motor based on the phase inductance positioning point proposed in this paper, the phase inductance function of each phase needs to be determined
Switched reluctance motor (SRM), as a new type of electromechanical integrated speed control system, has the characteristics of simple structure, strong robustness and high reliability.[1,2] This type of motor is widely used in mining, public transportation, textile machinery and many other fields
The key to the ability of a switched reluctance motor to rotate is to detect the position of the rotor and to switch between different phases on and off in time to change the magnetic field of the motor and generate a different electromagnetic force than before the commutation
Summary
According to the method of determining the rotor position of the switched reluctance motor based on the phase inductance positioning point proposed in this paper, the phase inductance function of each phase needs to be determined. According to the slope method, the inductance expression of the three-phase switched reluctance motor can be obtained as: L(θ). In the formula, ∆i is the slope difference of the phase current between the MOS tube on and off. According to formula (1), a series of inductance values at different positions and angles in the full cycle of the SRM can be calculated, and the corresponding functional relationship can be obtained by the method of numerical fitting
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