motor startup mode,auto voltage reducing total pressure direct start starting

Total pressure directly starting:At both capacity and load of power grid allows total pressure

directly under the condition of starting,can consider to use the direct starting.Advantage is that

control is convenient,simple maintenance,And more economic.Mainly used in small power motor starting from saving energy point of view,should not be greater than 11 kw motor by this method. Auto voltage reducing starting:Using the autotransformer tapped the reduced pressure,can adapt to the needs of different load starting,and can get electric vehicle motor a bigger starting torque,is a kind of is often used to starting larger capacity The decompression starting mode of the motor.Its the biggest advantage is starting torque is bigger,when the tap at 80%,starting torque can be up to 64% of direct starting.and And can be tapped to adjust starting torque.Are still widely used. Y-delta starting:For the normal operation of the stator winding for delta connection squirrel-cage asynchronous motor,if at the time of starting the stator windings into star,waiting for start to end to pick up again Into a triangle,can reduce the starting current,reduce its impact on power grid.Such starting way is called star triangle decompression starting,or simply the star delta starter (y-delta Start).Using star delta starter,starting current is only according to the delta connection directly when starting a third of the original.If direct starting at the time of starting current to 6~7 meter,ie In the star triangle is starting,the starting current is 2~2.3 times.This means using star delta starter,starting torque is reduced to the original starting directly based on the www.dongfeng-motor.com triangular connection A third.

Suitable for the occasion of no load or light load starting.And compared with any other decompression starter,its structure is the most simple,the price is the cheapest.In addition,the star

A further advantage of triangle starting way,that is,when the load is lighter,can let the motor run

in y connection.At this point,the rated torque and load can match,so Can make the motor efficiency is

improved,and thus save the electricity consumption. Soft starter:This is using the phase shift voltage regulating principle of silicon controlled to realize the regulating of the motor starting,it is mainly used for motor starting control,starting effect is good but the cost is higher.Due to the Use the thyristor,thyristor harmonic interference is larger at work,have a certain influence on power grid.Additional power fluctuations will also affect the 8500w gasoline generator thyristor conduction,special How much is in the same grid thyristor devices.So the thyristor failure rate is higher,because involving power electronic technology,thus to maintenance technicians Please also is higher. Converter:Inverter is the highest technical content of modern motor control field,most complete control function,the best control effect of motor control device,it by changing the frequency of the power grid Power saving motivation of rotational speed and torque.Because of involving power electronic technology,computer technology,so the cost is high,too high to the requirement of maintenance technicians,mainly used in accordingly Need to speed and areas of high speed control requirements.