Motor nameplate data and rating

Model:the series of varieties,the performance of the motor,protective structures,such as rotor type rotor and stator product code.Rated power:it means the runtime on the output mechanical power rating of the motor shaft,unit KW or HP,1 HP = 0.736 KW. Voltage:directly to the line on the stator winding voltage (V),the motor has two kinds of Y and delta connection,the connection shall be consistent with connection of regulation of motor nameplates,to ensure that corresponding to the rated voltage.

Current:motor under rated voltage and rated frequency,and www.dongfeng-

motor.com the output power rating of the stator winding current of three-phase line Frequency motor,which refer to gasoline generator spare partsconnect the ac power frequency of 50 hz+1 Chinese regulations Speed:motor under the rated voltage,rated frequency,rated load,motor speed (r/min) per minute; The generator stator 2 pole motor synchronous speed is 2880 / min.The duration of the work quota:refers to the motor running.Insulation class:the level of motor insulation materials,decided to allow temperature rise of the motor.Standard number:said design motor technical documents basis.Excitation voltage:refers to the synchronous motor excitation voltage (V) when the rated work.Field current:refers to the synchronous motor excitation current (A) when the rated work.

Three-phase ac motor is widely used in modern industrial

Three-phase ac motor is widely used in modern industrial and agricultural production in our country,for the development of the society,the progress provides a great convenience.However,if high power motor In the case of the power transformer capacity is not big enough start directly,because of the asynchronous motor starting current is big,can make the power transformer output voltage has fallen dramatically,not only Reduce the starting torque of motor itself,can also affect the normal work of the electric vehicle motor other equipment in the same supply network.Therefore,the high power motor need to adopt step-down rev Move.For high power motor racing and light load of starting,Y exchange is the most mature used step-down starting boot method.Y exchange start refers to the electricity Motivation starts,the stator windings into a star,in order to reduce the starting voltage,limit the starting current; After waiting for motor starting,and then change the stator windings connect into a triangle, Make the motor run from now on.

Who made triangle connection during normal operation of the stator winding asynchronous motor,the step-down method are available.Motor rev.When moving,connect into a Y shape,start in each phase of the stator winding voltage only delta connection,starting current for 1/3 of the delta connection,starting torque is only One third of the delta connection.According to the circuit to control the change of the type of core parts,step-down start can be divided into time relay based in starting and based on PLC control The system change after starting.Practice has proved,based on the starting time relay control it's easy to have a time relay,ac contactor break line,mechanical transmission parts stuck (Y type small startup torque) failure by refusing action and cause cannot step-down start,long arc,arc of cause pumps of interphase short circuit caused by such failure.Configuration software is a kind of data acquisition and process control of specialized software,it is in the level of automatic control system monitoring layer software platform and development environment,using flexible Configuration mode,to provide users to quickly build industrial automatic control system for monitoring function,general level of software tools.PLC based on configuration software Connected to the communication between upper PC to realize the remote control operation,operators can not only improve working environment,and can improve the safety of work.

Why can't arbitrary starting motor in cold environment?

Motor in the low temperature environment is too long,will be:(1) the motor insulation cracking;(2) bearing grease freeze.(3) wire connector solder powder.Motor in a cold electric fan motor parts environment,therefore,should be kept heating,winding and bearing check before operation.What are the cause of the unbalanced three-phase current motor?(1) three-phase voltage imbalance;(2) motor phase within a pumps certain branch welding is bad or contact;(3) the motor winding interturn short circuit or to ground,interphase short circuit;(4) connection errors.Why can't a 60 hz motor with pick up to 50 hz power supply?Generally make the silicon steel sheet when motor design work in the saturated area of the magnetization curve,when the supply voltage must be reduced frequency will increase magnetic flux,exciting current Flow increase,lead to motor current is added,copper loss increase,eventually led to electricalmotor1.blogspot.com the motor temperature rise up,serious when may also be due to the coil overheating and burning motor.