A DC motor with constant voltage brushes

Abstract

The invention relates to the technical field of motors. The purpose is to provide a DC motor with a constant voltage brush that can ensure stable brush pressure. The brush includes a base fixed on the mounting frame, and an edge seat is provided on the end surface of the base facing the end of the commutator. The sliding hole extending in the length direction of the body, the outer end of the sliding hole is provided with a carbon brush matching the sliding hole; the sliding hole is also provided with a driving block matching the sliding hole, the driving block and the carbon brush Electromagnets and permanent magnets are respectively arranged on the opposite surfaces, the electromagnets are opposite to the permanent magnets, and the electromagnets and the permanent magnets repel each other in a energized state. The invention can truly ensure the constant voltage contact between the brush and the commutator, and has fast response speed and flexible and convenient control.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a DC motor with constant voltage brushes. Background technique [0002] DC motor is a type of motor widely used in daily production and life. It usually includes housing, stator, rotor, commutator, brush and other components. The stator usually adopts permanent magnet or directional electromagnetic coil group, which is fixedly installed in the housing. , providing the magnetic force for the rotor. The rotor is usually composed of several groups of electromagnetic coils and magnetic cores wound on it, and interacts with the stator when excited to form a rotational force. The commutator is installed on the rotor, and it usually consists of multiple arc-shaped conductive sheets to form a ring, which is connected to the electromagnetic coil on the rotor and connected to the power supply through the brush. The DC motor has the characteristics of good starting and speed regulation per...

AI Technical Summary

Problems solved by technology

[0004] 2. The traditional commutator is a ring structure composed of multiple sections. The gap between two adjacent sections forms the commutation area of ​​the commutator, but it is also due to the existence of the gap that the commutator is constantly rotating. And in the process of contacting with the brush, there is a large wear on the brush at the edge of the gap, which causes the brush to wear too fast, and also causes the contact between the brush and the commutator to be unstable

[0005] 3. In order to adapt to underwater working conditions, the existing motor must ensure the sealing of its shell to prevent water from penetrating into the motor and causing damage to electrical components

However, for deep water and ultra-deep water operations, due to the increase of external water pressure, the conventional sealing ring can no longer guarantee the reliability of its sealing, especially the reliability of the dynamic sealing of the rotor part. For small motors, considering the components The machinability of the motor and the mechanical seal cannot be adapted. Therefore, a special waterproof structure of the motor rotor is needed to improve the overall underwater operation performance of the motor

[0006] 4. The fan heat of the existing motor is mainly blown by the cooling fan installed inside to cool the rotor with air. For underwater operations, the traditional air cooling cannot be matched, and it can only be done by sealing the motor shell , to cool down the temperature of the motor through natural water cooling of the shell

However, the heat exchange of this cooling method is mainly concentrated on the outer surface of the shell, and its cooling speed is relatively slow, which is not suitable for some high-speed motors. Therefore, how to optimize the heat dissipation structure of the motor is also a major problem in this field.

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