Three-phase asynchronous motor connector

A change, triangular connection motor y connection Normal operation by delta connection of three-phase asynchronous motor, in order to reduce power use, can take three phase electric fan motor parts windings into star after online on the power supply voltage of 380 v, about 34% of the rated power is the power of the motor. For example, the 380 v delta connection 10 KW three-phase asynchronous motor to change into a star, meet online voltage of 380 v three-phase power use, at this time the power output of the motor is about 3.4 KW. Second, the three-phase asynchronous motor single-phase asynchronous motor Y connection and delta connection of three-phase motor changes the same way. Open the three-phase asynchronous motor terminal box, between any two phase power terminal access to a capacitor. The capacitor between V1 and W1, for example, it is at this point to connect single-phase power supply between the U1 and V1 or W1 (assuming the power of connect between the U1 and V1 motor, the power supply in U1 and electric opportunity inversion between W1,) can transform the original three-phase asynchronous motor converted a single-phase asynchronous motor. This method is especially suitable for no occasion of three-phase power supply using three-phase asynchronous motor. The capacity of the capacitor C = KP obtained are available, and where C is the capacity of the capacitor, the unit is the micro method (u F); P is the power of the motor, the unit is a kilowatt (KW); K is the empirical coefficient, take 0.06 when y-connection three-phase asynchronous motor, triangle sexual connection for 0.1. 

For example, 10 kw three-phase asynchronous motor when the star connection KP = C = 0.06 x 10 = 0.6 u F; 10 kw three-phase asynchronous motor triangle connection KP = C = 0.1 x 10 u F = 1. Changed to: after instead www.dongfeng-motor.com of capacitor terminals, such as the case of U1 power cord, another power cord by V1 connector on the W1 can realize inversion, the inversion of the inversion principle of single-phase asynchronous motor with the same principle Connect power: after the change is a single-phase capacitance motor, its effective power is 70% of the original motor power, for example: 10 kw three-phase asynchronous motor connector into effective power single-phase capacitor motor is about 7 kw. Convert into single-phase capacitor start motor, its effective power is 40% of the original asynchronous motor motor power, for example: 10 kw three-phase asynchronous motor connector into effective power for 4 kw single-phase capacitor start motor. To pick up after each phase winding voltage for no more than the rated voltage of the winding. What kind of motor depends on specific convert into being dragged the power of agricultural machinery. When convert into single-phase capacitor start motor, need to add one more time relay, wiring method is: put the time delay of time relay to disconnect the instantaneous closure in series capacitor circuit, the normally closed contact of time relay coil in parallel on both ends of single-phase power supply (time relay coil of the rated voltage is the same as the power supply voltage). After connected circuit, adjust the delay time of time relay, can work normally. Its working principle is: when switched on, time relay and motor for electricity at the same time, the capacitor circuit switched on, the motor starts, when the speed reached about 80% of the rated speed (implementation) by adjusting the delay time relay time delay disconnect instantaneous closure of time relay normally closed contacts disconnect, cut off the capacitor circuit, motor function.

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.

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