How linear motors work
The research and application of linear motors in China began in the early 1970s. At present, the main results are factory driving, electromagnetic hammer, punching machine and so on. Although China's linear motor research has also achieved some achievements, compared with foreign countries, there is still a big gap in its promotion and application. At present, many research units in China have noticed this.
How linear motors work
A linear motor is a transmission that converts electrical energy directly into linear motion mechanical energy without the need for any intermediate conversion mechanism. It can be viewed as a rotating electric machine according radially cut and developed into a plane is made from one side of the stator is referred to as primary evolution, from a side of the rotor is called secondary evolution. In practical applications, the primary and secondary are manufactured to different lengths to ensure that the coupling between the primary and secondary remains constant over the desired range of travel. The linear motor can be a short primary long secondary or a long primary short secondary. In view of manufacturing costs and operating costs, short primary primary secondary is currently used.
Linear motors work similarly to rotating motors. Taking a linear induction motor as an example: when the primary winding is connected to the AC power source, a traveling wave magnetic field is generated in the air gap. Under the cutting of the traveling wave magnetic field, the electromotive force is induced and a current is generated, which is in the air gap. The magnetic field phase produces an electromagnetic thrust. If the primary is fixed, the secondary moves linearly under the action of the thrust; otherwise, the primary performs a linear motion.
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