Halbach array permanent magnet DC brushless motor

Abstract

The present invention discloses a Halbach array permanent magnet DC brushless motor which comprises a shell, a stator, a rotor and a commutation circuit. The rotor comprises a rotary table body and 4n permanent magnet blocks which form a Halbach ring array. The stator comprises a magnet yoke and 4n groups of coils for constructing the Halbach array. The commutation circuit is connected to the coils. When the radially magnetized permanent magnet blocks and coils pointing at the permanent magnet blocks are in the same magnetic direction, the current direction of the coils is changed. Both the rotor permanent magnet blocks and the stator coils use the Halbach arrays, the electrical magnetic field generated by the coils at an action pole surface is larger than that of a traditional structure coil, the utilization rate of magnetic energy is improved significantly, and the magnetic field intensity between a permanent magnet ring and an induction ring is improved significantly. Compared with the existing motor, torque and power density are larger in the same volume, the volume and weight are smaller in the same output power, and the Halbach array permanent magnet DC brushless motor has the advantages of simple structure, high efficiency, good heat dissipation and low failure rate and belongs to a novel brushless motor.

Description

technical field [0001] The invention belongs to the technical field of motors, in particular to a Halbach array type permanent magnet DC brushless motor. Background technique [0002] With the development of permanent magnet motors towards high efficiency, high speed, high power density, and miniaturization, traditional permanent magnet motors show certain limitations. The magnetic energy utilization rate of rotor permanent magnet blocks and stator windings is low. Since each permanent magnet block There can only be one pole surface corresponding to the pole piece of the coil between the energized coil, and the magnetic field at the other end of the coil and the other end of the permanent magnet block does not participate in the work. being utilized, resulting in low utilization rate of magnetic energy; [0003] At present, the synthesized magnetic field of the Halbach column permanent magnet is widely used in motors due to its excellent characteristics. The Halbach column ...

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Problems solved by technology

[0004] However, although the existing Halbach column motor adopts the Halbach column structure as the permanent magnet, the utilization rate of the magnetic energy of the stator winding is still low, because of the inherent defect in the design of the circular stator winding, each coil can only have one pole shoe, and the coil The other end of the stator must be opposite to the rotor. When the power is applied, the coil is always in the working state of the unipolar electromagnetic field, and the electromagnetic field of the other magnetic pole cannot be used, which directly leads to the low utilization rate of the magnetic energy of the stator coil.

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