Brush DC motor

Abstract

The invention provides a brush DC motor, the both ends of a motor shell is connected fixedly with left and right cover, the left cover is provided with a left bearing location hole and a left bearing, the right cover is provided with a right bearing location hole and a right bearing, the left shaft end of rotor shaft is used for slewing bearing through the left bearing, the right shaft end of rotor shaft is used for slewing bearing through the right bearing, the device is characterized that the right end face of the right shaft outer ring is made axial displacement restricting through Shaft with a collar arranged on rotor shaft; between the left shaft and commutator is provided with conical spring, the small head end of the conical spring is supported with the right side end of the left shaft inner ring, the big end is supported with the bottom end of the commutator, the left side end of the left bearing outer ring is limited by step of the left bearing location hole. The device has the advantages that the stator shaft has the reliable axial displacement restricting, the commutator has simple technology, light weight, low cost, solid structure, good heat dissipation and can meet high speed work requirement.

Description

technical field [0001] The invention relates to an improved invention of a brushed DC motor. Background technique [0002] The brushed DC motors of the prior art mainly have the following deficiencies: 1. The axial positioning of the rotor shaft is not particularly reliable, and the amount of axial movement is large when the motor is working; 2. The weight of the commutator is heavy and the heat dissipation performance is poor. All directly affect the high-speed working requirements of the brushed DC motor; 3. The manufacturing process of the commutator is relatively complicated and the cost is high. The commutator of the prior art includes a plastic base and commutation copper sheets evenly arranged on the outer circumference of the plastic base. It is formed by cold stamping process, so the manufacturing process of the reversing copper sheet is not only complicated, but also the weight of the reversing copper sheet is heavy, the consumables are large, and the cost is high...

AI Technical Summary

Problems solved by technology

[0002] The brushed DC motors of the prior art mainly have the following deficiencies: 1. The axial positioning of the rotor shaft is not particularly reliable, and the amount of axial movement is large when the motor is working; 2. The weight of the commutator is heavy and the heat dissipation performance is poor. Both directly affect the high-speed working requirements of the brushed DC motor; 3. The manufacturing process of the commutator is relatively complicated and the cost is high

The commutator of the prior art includes a plastic base and commutation copper sheets evenly arranged on the outer circumference of the plastic base. It is formed by cold stamping process, so the manufacturing process of the reversing copper sheet is not only complicated, but also the weight of the reversing copper sheet is heavy, the consumables are large, and the cost is high; and the plastic substrate must be combined with the hook, so the plastic substrate must be made of reversing copper sheet The full height of the commutator is set, so the plastic substrate is also heavy in weight, large in consumables, and high in cost, and also reduces the heat dissipation performance of the commutator; In order to ensure the firmness of the structure, the inner surface of the commutation copper sheet is often equipped with a reinforcement ring groove in the up and down direction to place the reinforcement ring, so the structure of the commutator is more complicated and the cost is increased; also, the hook of the commutation copper sheet is in the When welding wires, there is often an inversion phenomenon, resulting in poor quality of welding wires and affecting the life of the motor

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