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Dc motor

Issue Time:2020-07-16
Who invented the earliest motor in the world?
In 1957, the German Wankel invented the rotary piston engine, which is an important branch of the development of gasoline engines. The characteristics of the rotor engine are the use of a mechanism that combines the inner and outer circular rotor wires and the outer rotor and inner rotor wires, without the crankshaft connecting rod and the gas distribution mechanism, which can directly to convert the triangular piston motions into rotary motion. The number of parts is 40% less than that of the comparison piston gasoline, light weight, small size, and high power.

In 1958, Wankel replaced the outer rotor with a fixed rotor for planetary motion, making it a new type of rotary piston engine with a power of 22.79 kilowatts, which became 5,500 rpms. The motor has important development value, so it has attracted the attention to many countries. It can be said that the rotor engine was born in Germany and grew up in Japan.


In 1982, Japan reduces the size of racing cars used for professional sports, removed the steering and a device requiring remote control and successfully manufactured the first miniature four-wheel drives racing car. It belongs referred to as the mini 4WD motor. Later, this kind of motor was widely used in various toys, such as four-wheel drive vehicles, small electric fans with USB ports, etc.

What are the components of the small motor
1, Thick anti-wear copper brush
2, High temperature resistant silicon steel
3, Winding copper wires
4, Machine bearing
5, Hollow case
6, Magnet
7, Wear-resistant rotor 
8, Hollow lid
How to choose the right motor?

Due to the different materials used in the production of the motor, its production cost and working performance very greatly. The magnet steel (stator) of high-quality motors is made of rare earth alloy materials, and the magnetic field strength is 10 times higher than that of ordinary magnets. The rotor is also made of low reluctance alloy. This motor has high torque, high speed and power saving when working (no-load speed is above 56000 rpm). But their prices are also higher.


Under normal circumstances, there is no instrument around us that can be measured. From a selection perspective, we can compare the magnetic field strength of the motor magnet and test whether the motor parts is flexible, observe the parts, to judge the performance of the motor. Brand awareness and credibility. 


If you have a strong hands-on ability, purchases your own accessories, and wrap your own assembled motor.

The principle of motor rotation

The motor is rotated by the electromagnetic force received by the coil. When the current passes through the coil of the magnetic field, the coil receives the force of the magnetic field. This force is called the electromagnetic force, when the coil is fed with current and the direction of the current is X According to Fleming's left-hand rule, the coil will be pushed upwards. At the same time, when the current direction is Y, the coil will be pushed downwards. These two forces interact to achieve balance and make the motor rotate.