Fault-tolerant type single-winding bearing-less permanent magnet motor

Abstract

The invention discloses a fault-tolerant type single-winding bearing-less permanent magnet motor. A stator magnet yoke is in a cylinder shape and is placed on the outermost portion of the permanent magnet motor. A rotating shaft and the stator magnet yoke are coaxial, the rotating shaft is placed in the middle in the stator magnet yoke, a rotor iron core coaxial with the rotating shaft is fixed on the outer periphery surface of the rotating shaft, and a plurality of permanent magnets which are evenly distributed on the outer surface of the rotor iron core in a Halbach array structure to form a cylinder shape are fixed on the outer periphery surface of the rotating shaft. Six armature teeth and six fault-tolerant teeth which are arranged in an alternating mode in the periphery direction are fixed evenly on the inner periphery face of the stator magnet yoke. Each armature tooth is provided with a set of an armature winding which generates torque and radial suspension force at the same time in a winding mode. Each set of armature winding is of a concentrating short-distance winding structure. Each phase control current is formed by overlapping of a torque winding control current component and a suspension force winding control current component. According to the fault-tolerant type single-winding bearing-less permanent magnet motor, only one set of armature winding is needed, the structure is simple, motor weight is lowered, and the suspension operation capacity with fault of the motor is improved.

Description

technical field [0001] The invention relates to the technical fields of electrician, motor, and magnetic levitation, in particular to a bearingless permanent magnet motor, which is suitable for direct special fields such as direct-drive spindles of CNC machine tools, flywheel energy storage systems, and the like. Background technique [0002] Utilizing the similarity between the coil (or winding) of the magnetic suspension bearing (referred to as magnetic bearing) and the stator structure of the traditional permanent magnet motor, the coil of the magnetic bearing is stacked in the stator slot of the permanent magnet motor, and by effectively controlling the current of the two sets of windings By adjusting the amplitude and phase angle, the stable suspension operation of the rotating shaft can be realized, and a bearingless permanent magnet motor with a novel structure is formed. Bearingless permanent magnet motors also have a series of advantages such as no friction and wear...

AI Technical Summary

Problems solved by technology

However, the structure of the two sets of windings has the following disadvantages: ①The winding structure is complex, and the power loss on the stator side is large; ②Strict insulation is required between the two sets of windings, thereby increasing the insulating material, resulting in large magnetic flux leakage, reducing the slot full rate, and seriously affecting Motor performance; ③Bearingless motors have strict requirements on the two sets of windings, and the A-phase axes of the two sets of windings must be strictly coincident, which increases the difficulty of motor manufacturing and is not conducive to the practical application of bearingless motors

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