The working principle of the permanent magnet synchronous motor

The working principle of the permanent magnet synchronous motor measurement device problem complement advantages and weaknesses: measuring equipment PM synchronous motor synchronous generator in order to realize the transformation of energy,need to have a dc magnetic field.And the direct current magnetic field,Known as the generator excitation current.According to the method of field current supply,which obtained from other 220v ac electric motorssource excitation current of the generator,called separately excited generator,excitation power from the generator itself,it is called a self-excited generators.A,power generation Machine for several kinds of mode 1,dc generator excitation current excitation power supply: this way of excitation generator has a dedicated dc generator,the dedicated dc generator,called dc exciter,generally with generator exciter Axis,generator exciting winding through perfectly on the large axial slip ring and fixed brush obtained from dc exciter current.This way of field independent excitation current,more reliable and decrease for electricity consumption,etc,is in the past few decades Main motor excitation way and has a mature operating experience.Defect is excitation regulating speed slower,maintenance workload is big,it is rarely used in more than 10 mw units.

2,ac exciter power supply mode of excitation,modern large capacity power generation Provide field current machine some use ac exciter.Ac exciter is installed on the generator shaft,its output of alternating current flows through the rectifier supply generator rotor excitation,at this point,his way of excitation of generator excitation way,and as a result of the static Check of the rectifying device,so it is also called separately excited static excitation,exchange vice exciter

excitation current.Deputy exciter communication can be permanent magnetic measuring device machine or alternator with self-excitation constant pressure device.In order to improve the excitation

regulating speed,ac excitation Magnetic machine usually USES the 100-200 hz frequency generator,vice exciter and communication,the use of the 400-500 hz frequency generator.This kind of generator and three-phase ac dc excitation winding winding around the stator slot,rotor teeth and slots not only round Group,like a gear,therefore,it has no brush and slip ring contact parts such as rotation,has

reliable operation,simple structure,convenient manufacturing process.The disadvantage is induction motor price that the noise is bigger,ac voltage harmonic component is bigger also.

3,without exciter excitation Magnetic way: in the way of excitation is not set up special exciter,and obtained from the generator itself excitation power supply,the rectifier supply again after excitation generator itself,according to static excitation self-excitation type.Static excitation self-excitation type can be divided into the shunt and the compound of two Kind of way.Since the shunt way it through joint in the export of generator excitation current of rectifier transformer,the rectifier supply generator excitation,after this way of excitation has simple knot,equipment,less investment and less maintenance workload,etc.Since after Besides no rectification transformer excitation mode,also has series high- power current transformer in generator stator loop.This is used in the case of short circuit of

transformer,provide generator excitation current,to make up for the rectifier transformer output is not The foot.This way of excitation has two kinds of 220v ac electric motors excitation source,through the voltage rectifier transformer power supply and current source through series transformer.