Research and industrial application of a novel compound permanent magnet synchronous machine |
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| Authors: | Cheng-zhi Fan Ming-xing Huang Yun-yue Ye |
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| Institution: | (1) School of Electrical Engineering, Zhejiang University, Hangzhou, 310027, China |
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| Abstract: | We propose a novel kind of compound permanent magnet synchronous machine (CPMSM), which is applicable in low-speed and high-torque
situations. We first explain the structure of the CPMSM. Based on theoretically deducing the calculation formulae of the CPMSM
electromagnetic parameters, we analyze the operating characteristics of the CPMSM, and obtain the power-angle curves and working
curves. The no-load magnetic field distribution and the cogging torque are analyzed by applying the finite element method
of three-dimensional (3D) magnetic fields, to determine the no-load leakage coefficient and the waveform of the cogging torque.
Furthermore, the optimal parameters of the permanent magnet for reducing the cogging torque are determined. An important application
target of the CPMSM is in direct-drive pumping units. We have installed and tested a directdrive pumping unit in an existing
oil well. Test results show that the power consumption of the direct-drive pumping unit driven by CPMSM is 61.1% of that of
the beam-pumping unit, and that the floor space and weight are only 50% of those of a beam-pumping unit. The noise output
does not exceed 58 dB in a range of 1 m around the machine when the machine is 1.5 m from the ground.
Project (No. 50607016) supported by the National Natural Science Foundation of China |
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| Keywords: | Compound permanent magnet synchronous machine (CPMSM) Operating characteristic Three-dimensional finite element analysis Cogging torque Direct-drive pumping unit |
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