Abstract
This paper proposes a new high-precision rotor position measurement (RPM) method for permanent magnet spherical motors (PMSMs). In the proposed method, a LED light spot generation module (LSGM) was installed at the top of the rotor shaft. In the LSGM, three LEDs were arranged in a straight line with different distances between them, which were formed as three optical feature points (OFPs). The images of the three OFPs acquired by a high-speed camera were used to calculate the rotor position of PMSMs in the world coordinate frame. An experimental platform was built to verify the effectiveness of the proposed RPM method.
Highlights
A spherical motor can make complex motions of three degree-of-freedom (DOF) with its simple structure, which can be applied to many applications, such as robotics, aerospace and military.It has advantages over traditional three DOF motors, which are composed of several single-DOF [1,2], such as low manufacturing cost and high efficiency
A stator coordinate frame (SCF) and a rotor coordinate frame (RCF) are used in a permanent magnet spherical motors (PMSMs) to describe the motion of a spherical rotor
This paper presents a novel Rotor position measurement (RPM) method for a PMSM based on image processing
Summary
Yin Lu 1,2 , Cungang Hu 2,3, *, Qunjing Wang 2,3 , Yi Hong 1,4 , Weixiang Shen 5. National Engineering Laboratory of Energy-Saving Motor and Control Technology, Hefei 230601, China. Received: October 2018; Accepted: November 2018; Published: 28 November 2018
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