Flat brushless motor

[0024] See figure 1 with figure 2 The flat brushless motor of the present invention includes a cup-shaped base 1, a cover 2, a PCB printed circuit board 11 and an IC control integrated circuit 12. A support shaft 3 is fixedly installed on the base 1, a rotor assembly 4 is sleeved on the support shaft 3, and a stator assembly 8 is arranged around the rotor assembly 4. The PCB printed circuit board 11 is sleeved on the supporting shaft 3, located above the rotor assembly 4 and the stator assembly 8, and placed in the cover 2 to supply control current to the coils of the stator assembly. The PCB printed circuit board 11 is provided with an IC control integrated circuit 12 composed of a sensor and a control integrated circuit. The sensor is placed at the position where the magnetic pole changes. When the current flows through the coil, magnetic poles will be generated. They will act on the rotor assembly and cause the rotor to vibrate.

[0025] The rotor assembly 4 includes a bearing 5 mounted on the supporting shaft 3, an eccentric wheel 6 arranged on the bearing to generate vibration force, and a magnetic ring 7 mounted on the outside of the eccentric wheel.

[0026] With reference to Figures 3 and 4, the eccentric part of the eccentric wheel 6 is a sector-shaped columnar body with a flange 61 on one side. The magnetic ring 7 is designed according to the stator and is filled with multiple pairs of N and S sequentially along the circumference. The magnetic poles can be 3-6 pairs of poles, and the invention is described as four pairs of poles.

[0027] The stator assembly 8 includes upper and lower electromagnetic pole plates 9 ′ and 9, and coils 10 arranged in grooves of the electromagnetic poles (plates) 9 ′ and 9, and are located in the base 1. Refer to Figure 5 As shown in Fig. 6, the upper and lower electromagnetic pole plates 9', 9 are respectively composed of a circular ring 91 and four magnetic poles 92 extending vertically from the inner circle of the circular ring to one side and evenly distributed along the circumference. The number of magnetic poles on the upper and lower electromagnetic pole plates is the same and interleaved with each other. In practical applications, molds are used to inject the upper and lower electromagnetic plates together to reduce the space occupied by the coil.

[0028] The base 1 and the cover 2 are in a sealed connection, which can prevent magnetic leakage and easily dissipate heat, forming a motor in the shape of a sealed button. The length of the supporting shaft 3 is as long as the thickness of the motor.

[0029] The material of the eccentric wheel 6 is a high-density material, such as a tungsten-nickel alloy.