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Micromachines 2017, 8(6), 174; doi:10.3390/mi8060174

Rapid Prototyping of a Micromotor with an Optical Rotary Encoder

Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, 415 Jian Gong Rd., Sanmin Dist., Kaohsiung 80778, Taiwan
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Academic Editors: Mustafizur Rahman and Tanveer Saleh
Received: 28 April 2017 / Revised: 24 May 2017 / Accepted: 29 May 2017 / Published: 2 June 2017
(This article belongs to the Special Issue State-Of-The-Art Micromachining)

Abstract

This study proposed a rapid prototyping fabrication method for micromotors that allowed us to develop both 1 mm and 1.5 mm diameter permanent-magnet synchronous motors (PMSMs) with an optical rotary encoder. First, an integrated electroforming method was proposed for combining stator housing and flexible print circuit (FPC) coils to ease the manufacturing and assembly of micromotor components. This is particularly useful in the production of prototypes or small volumes of units. Second, an optical encoder was used to detect the rotational angle by means of a reflective code disk, an optical fiber, and a photo-detector. The micromotor was built with a code disk and an optical fiber. The code disk was designed to match the optical fiber and was made by photolithography and sputtering. Both the 1 mm and 1.5 mm diameter motors successfully achieved a rotational speed over 20,000 RPM and due to a 50 µm diameter optical fiber core, the encoders showed a resolution of 12 and 18 pulses per revolution (PPR), respectively. View Full-Text
Keywords: micromotor; permanent-magnet synchronous motors; flexible print circuit; electroforming; optical encoder; optical fiber; rapid prototyping micromotor; permanent-magnet synchronous motors; flexible print circuit; electroforming; optical encoder; optical fiber; rapid prototyping
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Pang, D.-C.; Lai, Y.-W. Rapid Prototyping of a Micromotor with an Optical Rotary Encoder. Micromachines 2017, 8, 174.

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