| The bearingless permanent magnet synchronous motor (BPMSM) is an innovational type of motor, which has the function and excellence of magnetic bearings. With its special structure and no-contact operation, BPMSM has great potential application prospect in special electric drive field such as biologic engineering, semiconductor manufacturing, food processing industries, flywheel energy storage, robot, aeronautics and astronautics. Thus, the research on BPMSM has received a lot of attention. Based on the DSP technology, this paper focuses on the digital control of BPMSM.Firstly, the principle of producing magnetic forces in the motor has been analyzed and the basic theories of BPMSM have been discussed in detail. The mathematic relationship between radial force and radial force winding current has been deduced. Then based on the principle of producing radial force and the mathematic model, the rotor field oriented vector control method is proposed for decoupling control.Secondly, the hardware platform of the digital control system has been designed and discussed in detail. Then the corresponding software based on TMS320LF2407A of the control system has been developed and the flowcharts of each functional block are presented. Considering the disturbance in the system, both software and hardware anti-interference measures are taken in the development of the control system.Finally, the digital control system of BPMSM has been developed with the designed Graphic User's Interface. The hardware and software have been debugged and the relative experimental results have been analyzed. The validity of the algorithm is testified on the basis of the partial experiment and the test.
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