| Title |
A Study on Indirect Vector Control for Driving Multi-degree-of-freedom Spherical Motors for Traction |
| Authors |
김재혁(Jae-Hyuk Kim) ; 박범도(Beom-Do Park) ; 권용재(Yong-Jae Kwon) ; 김태형(Tae-Hyeong Kim) ; 강동우(Dong-Woo Kang) |
| DOI |
https://doi.org/10.5370/KIEEP.2023.72.1.26 |
| Keywords |
Multi-degree-of-freedom; Spherical motor; Induction motor; Permanent magnet; Vector control |
| Abstract |
The multi-degree-of-freedom spherical motor for traction has characteristics of rotation and steering. Although it is base on the rotation principle of an induction motor, only a spherical motor control method is required for rotation and steering. In order to estimate the speed command of the rotor, the mechanical angular velocity of the rotor is measured using an optical sensor, and the slip angular velocity is calculated with the current command of the d-q axis stator of the synchronous coordinate system. The rotor magnetic flux angle can be obtained in the above two ways, and through this, the vector control of the spherical motor is achieved.
The desired magnetic flux component current and torque component current are distributed to operate the spherical motor. As such, the indirect vector control method has advantages in that it is simple to implement because it does not use the magnetic flux linkage of the rotor and that it is easy to operate from low speed to rated speed. |