Outer rotor permanent magnet motor for ceiling type fan

Abstract

The invention relates to an outer rotor permanent magnet synchronous motor for a ceiling fan, which comprises a rotating shaft, a stator, a rotor and an electrical controlling device. The stator is sleeved on the rotating shaft, the rotor is sleeved on the outer side of the stator; the shaft of the rotor is installed on the rotating shaft though a bearing; the stator and the rotor have the same number of poles; the rotor is a permanent magnet pole, and the N, S poles thereof are alternately distributed; the stator is a salient pole with coils wound thereon, and the adjacent coils are in positive and negative winding directions to form an alternate magnetic poles; the stator is provided with two windings: a working winding and a starting winding, wherein the working winding is made of coils in the stator pole which are positive-negative connectedly wound and each coil affects the whole magnetic pole, and the starting winding is made of coils in the stator pole which are positive-negative connectedly wound and each coil affects part of the magnetic pole; and the coils of the working winding and the starting winding are connected with the electrical controlling device. The starting winding of the invention acts on part of the magnetic field of the stator magnetic pole to form a directional operation, and the directional starting can achieve 100 percent, thereby greatly improving the starting quality and enlarging the application range of the single phrase permanent magnet synchronous motor.

Description

technical field [0001] The invention relates to an outer rotor permanent magnet synchronous motor for a ceiling fan, in particular to a single-phase double-winding directional operation permanent magnet synchronous motor for a ceiling fan. Background technique [0002] Existing single-phase permanent magnet synchronous motor, its motor structure is that the rotor is a permanent magnet rotor, such as figure 2 As shown, there are two states for starting the motor, one is free direction starting, the probability of forward rotation and reverse rotation each account for 50%, which is only suitable for occasions where there is no steering requirement, and the other is directional starting, the method adopted is In the method of unequal air gap, the distance between the salient pole teeth of the stator core and the rotor, the structure of each pole is large on one side and small on the other. When the rotor starts, the electromagnetic force in one direction is greater than that in...

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Problems solved by technology

[0003] In the existing directional starting method of single-phase permanent magnet synchronous motor, the air gap of the motor is not equal, and the air gap on one side should not be too large. Increasing the air gap will affect the efficiency of the motor. In addition, the change of the air gap will also affect the initial state of the stator and rotor. The position of the state, the motor started by this method cannot guarantee 100% directional start. For the load with strict steering requirements, a one-way transmission wheel device is installed in the motor to realize the directional rotation of the single-phase permanent magnet synchronous motor. When this mechanical method increases the mechanical loss and friction noise of the motor

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