Novel permanent-magnet machine

[0009] The present invention is explained below in conjunction with accompanying drawing:

[0010] attached figure 2 It is an embodiment of the present invention. The difference between the present invention and the prior art can be seen more clearly.

[0011] attached figure 1 It is a partial cross-sectional view of the stator part of the existing permanent magnet motor. The stator 1 is provided with alternate teeth 2 and slots 3, and the space of the slot 3 is used for placing windings.

[0012] attached figure 2 It is a partial sectional view of the stator part of the permanent magnet motor of the present invention, from figure 2 It can be seen that the present invention is different from the prior art only in that a metal thin-walled ring 5 closely contacting with the stator for magnetic conduction is arranged at the inner circle of the stator 1, and the axial length of the ring is equal to the axial length of the stator. The tight contact mentioned here refers to the conduction of the magnetic circuit between the ring and the stator. Generally speaking, the ring 5 can be made of soft iron or metal with low carbon content. According to relevant tests, the radial thickness of the ring of the present invention can be 1/7-1/3 of the width of the opening 4 at the lower end of the stator slot.

[0013] An example of the present invention is a permanent magnet motor with a power of 300W. When the motor adopts the existing technology, that is, the stator is figure 1 When the structure is shown, the measured starting torque of the motor is 0.102N·M. And adopt the structure of the present invention, promptly adopt the attached figure 2 With the structure shown, the starting torque of the motor is reduced to 0.065N·M, which is 36% lower than that of the existing permanent magnet motor.