Design and Control of a Permanent Magnet RotLin Motor for New Foldable Photovoltaic Units

Abstract

In this study, a new permanent magnet rotary-linear (RotLin) motor is proposed for foldable photovoltaic units. Firstly, the mechanical structure, operation principles and magnetic circuits of the motor are introduced, and a design procedure elaborated the parameters calculation in the linear part and the rotary part. Finite element method (FEM) is used to analyze the magnetic field of the motor, and linear force outputs and torque outputs are obtained. Secondly, a control scheme is designed for the prototype of the motor including the position control and the speed control. The deformation on the mover and the magnetic coupling effect between the linear part and the rotational part are discussed. Finally, experimental results show that this motor can simultaneously realize a linear movement with continuous rotation. The linear poisoning accuracy can achieve 0.4 µm and the angular speed can be controlled with steady errors less than 3 rpm, proving the effectiveness of the proposed RotLin motor.

Design and Analysis of a Novel Converter Topology for Photovoltaic Pumps Based on Switched Reluctance Motor

“…The average voltage applied to the phase-A is DU dc . (15) where ton and toff are the turn-on and turn-off time periods of PWM in one cycle, respectively. The voltage chopping waveform with soft chopping control is shown in Figure 11.…”

“…In the angular position control mode, the opening and closing angles vary as the error of the speed, so as to change the excitation freewheeling time of the winding. (15) where ton and toff are the turn-on and turn-off time periods of PWM in one cycle, respectively. The voltage chopping waveform with soft chopping control is shown in Figure 11.…”

“…The emphasis is dragonfly algorithm with six controlling parameters, e.g., fuel cell temperature, air flow rate, air pressure, fuel pressure, and turn on/off angles of switched reluctance motor. A new permanent magnet RotLin motor, which is able to realize high-precision control both in the linear and the rotary directions, is introduced [15]. The motor structure and operation principles are introduced, followed by a detailed design procedure both on the linear part and the rotary part of the motor.…”