Linear Iron-core Permanent Magnet Motor with High Force and Low Acoustic Noise

Student: Jun young Yoon

Committee: Professor David L. Trumper (Chair), Professor Jeffrey H. Lang, Professor Steven B. Leeb


Acoustic noise and associated vibration are generic characteristics of electric machines including variable-reluctance motors, induction machines, and permanent magnet synchronous motors. The severity of this problem depends on the types of motors and their applications. One exemplary case where the vibro-acoustic noise becomes detrimental is iron-core linear motors operating at high acceleration and targeting for high accuracy.

In this doctoral research, we identify root causes of the vibro-acoustic noise of iron-core linear motors, and create magnetic designs paired with control algorithms to achieve high force with low noise and vibration. Vibro-acoustic noise issues of rotary machines have been researched over the years, but not as much work has been done for linear machines whose major causes of noise generation might be different from rotary motors due to the structural differences. This thesis focuses on the following aspects: 1) Investigate the causes and develop and verify theory for acoustic noise emitted from linear iron-core machines. 2) Design, construct, and test a new linear iron-core motor that can simultaneously provide high force and low noise. 3) Design and construct an experimental linear motor testbed to investigate the noise issue of conventional iron-core motors, and to demonstrate the new motor’s desired performance of high force and low noise.

Understanding causes of the vibro-acoustic noise and how to mitigate it in both the design and post-design phases will provide useful tools to achieve high-performance and quiet linear motion devices. This research will benefit many industrial applications which require both high throughput and high accuracy.

December 1, 2016. 3:00pm in 35–520 (LMP Given Lounge)