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About magnetic field strength

About magnetic field strength

Electric motors are a general term for electric motors and generators, usually divided into two categories: DC motors and AC motors. AC motors are divided into asynchronous motors and synchronous motors.

12

2024

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12

What is synchronous motor and asynchronous motor?

What is synchronous motor and asynchronous motor?

Electric motors are a general term for electric motors and generators, usually divided into two categories: DC motors and AC motors. AC motors are divided into asynchronous motors and synchronous motors.

04

2024

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12

How to maintain DC motor daily

How to maintain DC motor daily

The maintenance of the motor is mainly to check the bearing, commutator, brush holder and brush. Special attention must be paid to the shiny and clean sliding surface of the commutator and good contact with the brush. The surface of the commutator is brown and normal, and the sparks in the brushes are generally caused by mechanical reasons. The deformation of the commutator is not round, the mica plate of the commutator protrudes, the brush in the brush holder is stuck, the rotor is not well balanced, or the installation is not correct, resulting in unstable operation of the motor. In all these cases, appropriate measures must be taken.

30

2023

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10

Motor regular maintenance content

Motor regular maintenance content

Clean the disassembled motor and starting equipment to remove all sludge and dirt. During cleaning, observe the insulation condition of winding. If the insulation is dark brown or dark brown, it means that the insulation has aged. Special attention should be paid to the insulation not to collide and cause it to fall off. If any shedding is found, local insulation repair and painting shall be carried out.

30

2023

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10

How to distinguish between ordinary motor and variable frequency motor?

How to distinguish between ordinary motor and variable frequency motor?

Generally, the insulation grade of the variable frequency motor is F or higher, which strengthens the insulation to the ground and the insulation strength of the wire turns, especially considering the ability of the insulation to withstand the impact voltage.

30

2023

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10

Test run of DC motor

Test run of DC motor

The direct starting method has a large starting current, and the maximum impact current can reach 15 to 20 times the rated value. Therefore, it has a large impact on the power grid and the motor itself. It is usually only used for starting current 6 to 8 times the rated current and power is not greater than 4kW. DC motor. The armature circuit series resistance starting method has a large energy consumption during the starting process and is not suitable for large and medium-sized motors that often start. Decompression starting method and speed regulation method, low energy consumption, smooth starting, used for all kinds of DC motors that need to be started frequently.

30

2023

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10

Protection of DC Motor

Protection of DC Motor

The protection of the DC motor is to ensure the normal operation of the motor, prevent damage to the motor or mechanical equipment, and protect personal safety. Therefore, the protection of the DC motor is an indispensable part of the electrical control system. These protection links include short circuit protection, overvoltage and loss of voltage protection, overload protection, speed limit protection, excitation protection, etc. Some protection links are exactly the same as those of AC asynchronous motors.

30

2023

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10

Causes and inspection methods of spark generated by DC motor

Causes and inspection methods of spark generated by DC motor

Poor contact between brush and commutator. The reasons are as follows: the surface of the commutator is too dirty; The spring pressure is not suitable, and the spring pressure can be adjusted by spring balance or experience. When replacing the brush, other types of brushes were replaced by mistake. The clearance fit between the brush or brush holder is too tight or too loose. If the fit is too tight, emery cloth can be used to grind. If the contact surface is too small or the brush direction is reversed, the contact surface is too small is mainly caused by improper grinding method when replacing the brush.

30

2023

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10

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