Abstract
Considerable vibration and acoustic noise limit the further application of Switched Reluctance Machine (SRM) due to its structural characteristics and working principle. An improved SRM model with double auxiliary slots (DAS) was proposed, in which the direction of the magnetic line of force was adjusted, and the radial magnetic density in the air gap was reduced by changing the local tooth profiles of the stator and the rotor. The effects of initial rotor position and turn-on angle and turn-off angle on radial Electromagnetic Force (EMF) and maximum torque were investigated. The results indicate the radial EMF and torque increase significantly with the advancement of the turn-on angle or the delay of the turn-off angle. In the orthogonal experimental design, initial rotor position, turn-on angle, and turn-off angle were taken as the factors, and the optimal set of parameters that minimized radial EMF was determined according to a greater output torque. In contrast to conventional SRM, the radial EMF of the SRM with DAS significantly reduces when the optimal set is applied.
Highlights
On the other hand, many optimal control strategies have been developed to further reduce the radial Electromagnetic Force (EMF)
In the aspect of structure optimization, the main focuses are on improving strength of stator structure without considering the reduction of radial EMF; in the aspect of control strategy, most control methods are complex and not easy to be applied in practice
We first established the simulation model of different Switched Reluctance Machine (SRM). en, we explored the effects of the parameters on the magnetic density distribution and radial EMF of the improved SRM and decided the optimal parameter set
Summary
When the rotor pole is in the mid-way position, the rotor position θ is defined as 0°, and when the rotor pole in the aligned position, θ 11.25° obtained by the following equation:. Since ψ(i, θ) is determined by the inductance L(i, θ) and current i, the L(i, θ) value, i value, and mechanical output of the machine are calculated by the electromagnetic, voltage, and torque equations. After obtaining the magnetic linkage ψ(ik, θ), the torque per phase of SRM can be calculated by. E relationship between the phase flux and the k-phase current follow Faraday’s law: Uk. where ψ(ik, θ) is expressed in equation (10), from which it can be seen that ψ(i, θ) is a function of i and θ, so (14) can be rewritten as
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