Abstract
The thin wobble motors that are required to hold rating shafts employ an electropermanent magnet. This turns the holding force on and off by applying a momentary electrical pulse. To design the magnet devices without the need for finite element analyses, a theoretical force model is necessary for predicting the attractive force. In this paper, first, a force model is derived by estimating the permeance around the air gap. A magnetic circuit is constructed, employing a relatively simple method to build the model in clouding leakage flux. Thus, the basic structure and driving principle are also presented. Next, an analytical force model is constructed on the basis of distribution parameter analysis between the stator and the rotating shaft. The design of the electromagnet core and the control method are presented. Finally, a prototype model of the motor that is 30 mm in diameter and 7 mm in thick is fabricated. The two models are verified by comparing the results of FEM with the results of the experiments. They can properly predict the attractive force, so the thin wobble motor with holding force can be applied in portable electric equipment.
Highlights
Electromagnetic actuators, which have many advantages, including their small size, light weight, high precision, high accuracy, and high efficiency, have been widely used as rotary driving motors in various fields such as industrial machinery, medicine, human care device, electronic parts assembly, military equipment and mobile robots
We introduce a new type of wobble actuator with an electropermanent magnet (EPM)
We present a schematic of a thin wobble motor in order to validate the proposed force model, as well as the optimization of core shape, basic driving principle, basic structure and control method of the motor
Summary
Electromagnetic actuators, which have many advantages, including their small size, light weight, high precision, high accuracy, and high efficiency, have been widely used as rotary driving motors in various fields such as industrial machinery, medicine, human care device, electronic parts assembly, military equipment and mobile robots These motors are manufactured depending on the target application in various ways. It may cause mechanical backlash, added friction, or assembly errors, which may further occur to malfunctions when motor is operated To solve these problems, there have been a number of research and development efforts aiming to increase torque through the application of various types of reduction gear device [1,2]. Since the fringing effect and the leakage flux around the air gap are not considered, the results of magnetic circuit analysis led to a considerably large degree of error This is because it is difficult to accurately include them in magnetic circuits. We design an EPM device including magnets with a flat plate and a constant air gap, and propose a simple
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