馬達智財聯盟 Motor Intellectual Property Alliance

作者	Kwei-Yuan Chiou, Sheng-He Wang, Mi-Ching Tsai and Ching-Kuo Lin
摘要	The torque-speed characteristic measurements of electric motors are essential in the design and manufacture of motors. Dynamometer equipment has been widely used in motor characteristic measurements, and the coupling between the motor under test and dynamometer is the critical issue for high power electric motors. In this paper, a contactless dynamometer is introduced by the design of a permanent magnetic coupler driven by the eddycurrent, which has advantages in terms of reducing vibration, friction, and abrasion. A theoretical model of the magnetic coupler with different operating conditions is derived such that the torque-speed characteristics of the motor under test can be measured indirectly by controlling the magnetic coupler gap. An example of a 1.5kW DC motor with the maximum torque of 8.15N-m was adopted to demonstrate the effectiveness of the proposed measurement system. The experimental results showed that the maximum measuring error resulting from the presented approach can be reached within 6.48%, compared to that of using the dynamometer.
關鍵字	Eddy-current coupler, contactless coupling, torque-speed characteristics measurement