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.

The working principle of coil heating drying machine

Coil heating drying machine is actually a set of adjustable height of ac voltage transformer, secondary measurement of the output voltage, low bit of 0 ~ 14 v, high-grade is 16 ~ 28 v, by adjusting the switch 2 v per shift change. Through special homemade clamping device from commutator to the rotor winding ventilation with the appropriate voltage, current control in electric tool machine between 50% to 50% of the three phase generator rated current, rotor winding heat from inside to outside, can guarantee the uniform heating of winding, well guarantee the quality of dip coating and drying, prolong the service life www.facebook.com/guohong.trading of the rotor's actual. Notice that when you need heating drying older generator generator set rotor and secondary measurement output voltage, low should be 0 ~ 28 v, high-grade 32 ~ 56 v, by adjusting the switch to realize each file change 4 v, this should increase the capacity of transformer. The working principle of coil heating drying machine

Electrical engineer developed efficient motor technology

The key to reduce the loss of highly efficient motor all kinds of technology research, the main way

is to reduce the motor loss, this requires the motor on the mechanism of all kinds of loss extremely

thorough and meticulous research, to develop the potential of reduce the loss of all kinds of, this

is no longer a single electromagnetic design, it is based on the traditional motor design model to

establish a more power electric motors accurate mathematical physical model, and

considering the process, material, machining accuracy, the structure, the ratio of various factors

such as study, put forward to solve the key technology to reduce the loss of all kinds of motor and

the design technology, including the structure design and manufacturing technology of super efficient

motor, the rotor parameters, to reduce the power consumption of copper winding technology, reduce the

power consumption of the wind the wind road components, ventilation system and the design of the

bearing system, motor manufacturing technology research in order to reduce additional loss, etc. In

conclusion, to develop highly efficient motor can be developed the key technology needed to do the

job are briefly summarized as the following aspects: 1) in the motor loss calculation and analysis

research: traditional calculation method based on the analysis of the magnetic circuit loss and play

a major role in China's past series motors are designed, such as Y, Y2, Y3 series induction motor,

but this method exists empirical coefficient is various, such as local distribution cannot be

analyzed loss limitations. In order to solve this problem, the researchers conducted at home and

abroad based on modern computer technology for the analysis of loss of the new study, this respect is

the most widely used finite element method,www.facebook.com/dongfeng.motor
this method can easily handle arbitrary structure and arbitrary boundary conditions and complex

problems brought by the source distribution, at the same time can also plan and saturation within the

motor and nonlinear complex problems, such as in motor design has a unique advantage. Against the

super-efficient motor loss for this reason, the finite element simulation analysis and research, to

reveal the motor internal loss characteristics from the microscopic view has important theoretical

value, but also can be in order to further study how to improve the motor structure design to provide

necessary technical reference. 2) on the motor loss factors and structure improvement research:

because of the influence of the motor loss factor is various, involving motor iron core structure,

winding structure and manufacturing process, and so on. Most the influence factors of the core

structure, which mainly includes the stator slot,acmotortrading.blogspot.com
and the air gap size, chute and groove Angle, the size of the trough, trough type (closed slot or

semi-closed slots) and stator side structure, etc. For decades, limited to the limitation of

calculating method, in the design of asynchronous motor, the influence of core structure use no more

saturated theoretical value or experience value, the processing method can't for a specific factors

on the specific impact of the loss of an in-depth study. Therefore, in the super efficient early

motor development, the need for different motor structure finite element model is set up, by changing

the parameters of different motor structure and material properties, analyzed the influence extent of

different factors on the motor loss of concrete based on the optimal design scheme, and finally to

achieve. 3) in the motor loss test research: in the latest IEC motor test standard IEC60034-2-1 the

rotary motor (except for traction motor) to determine the efficiency and loss test method, the

regulation IEEEl12B method as the only test method of low uncertainty. So, if you want to develop

real conform to the high level of efficiency of motor, must be in low uncertainty of IEEE 1 I 2 b

method system research, the focus is to study the precise measurement of the input power under the

condition of low power factor, low uncertainty of additional loss and efficiency testing technology

as well as the uncertainty evaluation techniques. 4) to reduce the loss of other measures, the

development of highly efficient motor, also involves motor core materials, winding type and

manufacturing process and how to reduce the mechanical consumption research, by conducting such

studies can be from a certain 8500w gasoline generator extent, reach the purpose of

consumption.