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.
Highlights
Numerous linear motions and rotations are realized by electric motors for industrial instruments.Some of them employ linear motors and rotational motors together to manufacture products
Magnetic circuit analysis confirms the feasibility of the simple structure of the motor
The Finite element method (FEM) resulted has verified linear force outputs and rotational torque importantly, a control scheme for the motor is given and corresponding experimental results show that outputs simultaneously
Summary
Numerous linear motions and rotations are realized by electric motors for industrial instruments.Some of them employ linear motors and rotational motors together to manufacture products. Combining two motors for a linear-rotary motion is complex and the whole device could be cumbersome because many mechanical gears and subsystems have to be employed to meet the requirement of production. Traditional instruments using a linear motor and a rotary motor to realize the linear-rotary movement could have the inherent drawbacks of a large volume, high maintenance cost, and low manufacturing accuracy. In order to address these problems, integrated direct-drive rotary-linear (RotLin) motors will replace traditional linear-rotary motors and many RotLin motors will be employed by the industrial instruments for high-precision production in the future, especially in microchip production and flexible organic light-emitting diode (OLED) manufacturing [4]. A highly precise, simultaneous linear and rotary motion can be achieved by the RotLin motor with a compressed mechanical structure that involves both the linear part and the rotary part
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