Abstract
To solve the problems of large-size machining and complex control of fault-tolerant permanent magnet machines, a module-combined stator permanent magnet synchronous machine is proposed in this paper. The winding of the module-combined stator has two forms: large and small spans. The independent power supply of each module is adopted to decouple the electricity between each module, which enhances the manufacturing flexibility and the fault-tolerant ability of the motor. A mathematical model of the module-combined stator permanent magnet synchronous machine is established, and the design method of the machine is summarized. Then the analytical formula of the radial force acting on the stator under asymmetric operation is deduced. In addition, the torque-angle characteristics of the machine and the factors affecting the radial force are studied. Finally, the machine is prototyped, and both simulation and experiment are used verify the rationality of the proposed design.
Highlights
Low-speed and high-torque direct drive permanent magnet synchronous machines (PMSMs) can realize direct contact between power and load and offer the maximum energy transfer efficiency and are widely used in industrial production, wind power generation, ship propulsion and other fields [1]–[3]
Based on the context discussed above, this paper proposes a module-combined stator PMSM (MCS-PMSM), which realizes the modular production of the stator
The above analysis shows that when the motor parameters are fixed, the radial force generated by the asymmetric operation is related to the current during the normal operation of the motor, the angle occupied by the module in space, and the relative position of the fault module and the nonfault module
Summary
Low-speed and high-torque direct drive permanent magnet synchronous machines (PMSMs) can realize direct contact between power and load and offer the maximum energy transfer efficiency and are widely used in industrial production, wind power generation, ship propulsion and other fields [1]–[3]. A fault-tolerant control strategy of a five-phase permanent magnet synchronous motor is studied in [13]. [16], a stator field oriented fault-tolerant control strategy is adopted for a permanent magnet switched reluctance motor; that is, the q-axis current component of the motor armature remains unchanged after a fault, so that the output torque does not change and there is good dynamic performance in the case of a fault. A five-phase double stator tubular flux modulation fault-tolerant permanent magnet motor is studied in Ref. The number of slots per pole and phase determines the minimum number of slots and pole pairs required for the unit modular motor, while the pole-slot matching determines the maximum number of independent operation modules and the maximum number of power supply branches.
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