Thorn-shaped grounded de-noising element of micro motor rotor

Abstract

The invention discloses a thorn-shaped grounded de-noising element of a micro motor rotor. The thorn-shaped grounded de-noising element comprises a thorn-shaped substrate with a pawl, a wiring coil electrode which is arranged on the front surface of the pawl and a grounded electrode which is arranged on the back surface of the thorn-shaped substrate, wherein a rotary shaft hole through which a rotor rotary shaft penetrates is formed in the thorn-shaped substrate; and the grounded electrode and the wiring coil electrode are at least partially overlapped in the projection direction which is perpendicular to the plane of the thorn-shaped substrate. The thorn-shaped grounded de-noising element of the micro motor rotor is reliable in structure, high in flexural strength, simple in assembly step, high in electrostatic capacity, high in elimination and suppression capacity of a high-band motor electric noise of a micro motor, high in mounting and bonding strength of a rotor armature, high in reliability and high in de-noising energy. During assembly, an upward element welding electrode is applicable to automatic welding equipment operation and adapts to an automatic production equipment assembly mode of the micro motor, and the element is in accordance with technical development trends, can be of various specifications and dimensions and can be accurately applied to all motors.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to a grounding noise elimination component for a DC motor. Background technique [0002] Micro DC motors have the characteristics of small size, light weight, low power consumption, and good starting performance, and are widely used in household appliances, digital, automobiles and other products. When the micro-motor is running, its commutator will generate electric sparks and electrical noise, which will have an adverse effect on the equipment. The spectrum of electromagnetic noise is very wide. In order to eliminate high-frequency electrical noise, micro DC motors must meet the requirements of electromagnetic compatibility standards and must deal with these noises. [0003] In order to eliminate the spark electrical noise generated by the operation of the micro-motor and solve the problem of electromagnetic compatibility, the traditional method is to add capacitors, inductor...

AI Technical Summary

Problems solved by technology

The current ring varistor does not provide a good grounding path, and the filtering effect of the device will be greatly reduced

[0006] Annular varistors have the following disadvantages as noise-cancelling parts for micro-motors: ① Assembly and welding are difficult to automate

The welding point of the ring varistor is in the reverse side, and it is difficult to align, move and weld the welding head. It is very difficult to realize automatic welding and assembly, and the requirements for welding equipment are high. At present, no manufacturer is applying fully automatic assembly and welding. Equipment assembled on ring varistor micromotor

②The ring-shaped piezoresistor is only connected to the rotor by the welding point, which has poor firmness, and the impact resistance is the weak link in the micro-motor

③The electrical noise spectrum of the motor is a very wide and messy pulse signal. If the necessary suppression measures are not taken during the design of the whole machine (generally adding a grounding capacitor), the disturbance level (EMC) will exceed the limit in many cases

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