What is a two-speed motor

What is a two-speed motor Speed regulating pole double-speed asynchronous electric motors belong to variant,is by changing the connection of the stator winding the logarithmic method to change the

stator rotating magnetic field poles,which changes the Motor vehicle speed of the motor.A two-speed motor variable speed principle Variable speed of the motor by changing winding connection mode,that is to say,with a rotating magnetic field of magnetic pole change motor logarithmic to change its speed.Two-speed motor (fan),low speed at ordinary times,sometimes fan on high speed turning,mainly through the following external control wholesalemotor.blogspot.com circuit switch to change the way the motor coil winding connection.1,there are two different embedded in the stator slot logarithm of winding,by changing the external control line to change of motor stator winding connection to realize the logarithm change poles;2,in the asynchronous motor stator slot embedded,there are two different polar logarithmic independent winding;3,in the stator slot is embedded,there are two different logarithmic independent winding,and each winding can have different connection again.

The load current and no-load current of the machine

(1) asynchronous motor no-load running,set the current in the www.dongfeng-motor.com three-phase winding,referred to as the no-load current.Most of the no-load current is used to produce a rotating magnetic field,Is known as the no-load excitation current,no-load current of reactive component.There is a small part of no-load current is used to produce all kinds of power loss during no-load running (such as friction,ventilation and core loss),the no-load current is a part of the active component,due to account for the proportion of small,negligible.Therefore,light electricity Flow can be thought of reactive current.From this point of view,it is as small as possible,so that the power factor of the motor raised,the power supply is good. If no load current is big,because of the stator winding conductors carrying area is certain,allowed through current is certain,allows for active current only flows through the wire Can reduce,the motor can drive the load will be reduced,the motor output is reduced,with excessive load,the winding is easy to heat.But the no-load current Also cannot too small,otherwise will affect the other performance of the motor.Generally the no-load current of the small motor is about 30% ~ 70% of rated current,large and medium-sized electric The no-load current of the machine is about 20% ~ 40% of rated current.What is specific to the no-load current of an electric motor,on the motor nameplate or product acmotortrading.blogspot.com specifications,a Not marked.Have electrician often need to know how much is this value,this value to judge the quality of the motor repair,can use." (2) formula is the scene perkins diesel generator set quickly calculate motor no-load current of specific numerical formula,it is a lot of test data.It is in line with "the no-load current of the motor Is the 1/3 of its rated current ".At the same time it is in line with practice experience: "the no-load current motor lamination of the motor,shall not exceed the capacity of the kw number can be used for" the principle of (after repair Old,small capacity motor).Formula "capacity by about eighty percent for" refers to the general motor no-load current value was 0.8 times the number of motor rated capacity kw left On the right.No-load current of medium-sized,4 or 6 pole motor,is the number of motor capacity kw 0.8 times; The number of new series,large capacity,small 2 levels of motor,The no-load current calculation according to the number of "xinda sixty percent less"; For the old,old series,small capacity,the number of large more than 8 pole motor,the no-load current,Press "is a small number of very many kilowatts",namely the no-load current value approximately equal capacity kw,but is generally less than kilowatts.

Gear motor selection guide

In order to choose the most appropriate gear motor,it is necessary to understand the detailed

technical characteristics of the deceleration motor driven machine,you must define a using

coefficient of fB.Using coefficient of fB.The selection of electric vehicle motor gear motor first shall determine the following parameters:working hours a day; Start-stop times per hour; Cycle per hour; Reliability to O; Job machine torque T machine; The output rotational speed n; Load type; The environment temperature; The cooling conditions; Reducer is usually based on constant Torque,start stop not frequent,and design of room temperature. The www.dongfeng-motor.com allowable torque T be determined by the type:T=T out fB use coefficient X T-gear motor FB - reduction motor output torque using coefficient Transmission ratio(I)I=n into the P/n the motor power(kw)9550** n/P = T eta output torque T out(N.m)T=9550*P*eta/n type :n into - the input speed eta - reducer transmission efficiency When choosing gear motor,according to different working condition,must also satisfy the ac synchronous motor following conditions:1,2,T T a T work or machine machine type=fB*T always work :in fB - overall use factor,fB total=fB*KR fB1** KW fB - load characteristic coefficient,reliability coefficient KR - fB1 - environmental temperature The number; KW - cycle factor