Cascade speed regulation method

Cascade speed regulation refers to the motor rotor winding circuit in series motor vehicle spare partswith adjustable additional potential to change the slip of the motor,to achieve the purpose of speed control.Most of the slip power is absorbed by series of additional potential to recycle produce additional device,the absorption of 12 volt electric motor returning the slip power grid or conversion of energy use.According to the slip power utilization way,cascade speed regulation can be divided wholesalemotor.blogspot.com into motor cascade speed regulation,mechanical cascade speed regulation and thyristor cascade speed regulation form,adopts thyristor cascade speed regulation electrical motor.

 Its characteristic is: to speed the slip loss in the process of feedback to the grid or production machinery,high efficiency;Installed capacity is proportional to the speed range,the investment province,apply to speed range in production machinery from 70% to 90% of the rated speed;Speed regulating device failure can switch to run at full speed,avoid production;Thyristor cascade speed regulating power factor is low,the influence on harmonic.This method is suitable for the fan,water pump and the rolling mill,mine hoist,the extrusion machine use.

The classification of ac contactor purposes

Contactor is a kind of automation control of electrical appliances.Contactor is mainly used for frequent connected or mini electric motor diplomatic relations,dc,has a large capacity of control,remote operation,relay can realize timing operation and interlock control,all kinds of quantitative control and the pressure loss and under-voltage electric motors 12 volt protection,widely used in automatic control circuit,the main control object is motor,can also be used to control other electric power load,such as electric heaters,lighting,electric welder,capacitor Banks,etc.Contactor can be divided by accused of current type ac contactor and dc contactor.Here introduces the commonly used ac contactor.Communication ac electric

motor can be divided into the electromagnetic contactor and vacuum type two kinds.

The common malfunction and expel the three-phase asynchronous motor

Pick to:People's Daily life cannot leave the use of the motor,the production,220v ac electric motors in the using process of www.dongfeng-motor.com the motor has a lot of attention and requirements,may cause significant safety accident.Therefore,how to timely diagnosis permanent magnet motors for sale and troubleshooting,prevent accidents,ensure the safe,reliable and efficient operation of motor,is particularly important for enterprises.Motor fault types,is more complex,can be summarized as two aspects of mechanical and rotor and stator electrical,machinery has swept

chamber,vibration,overheating and damage to the bearing fault; Electrical failure of the stator

windings without phase operation,the reverse of the stator winding unbalanced three phase

current,short-circuit and ground heating winding and rotor winding fault,open circuit,etc.The

analysis in this paper,the commonly used motor fault problems,some one motor fault diagnosis and

maintenance and repair measures.

The fan blade

In the context of the fan www.dongfeng-motor.com blade or blades,electric tools

series motor rotor fan blade have to use fan leaf (iron,plastic) and single-phase,three-phase

asynchronous motor with fan leaf (now mostly plastic).Single and three-phase asynchronous motor,the make and model of the fan blade by the motor model,the number printed on the surface of the fan blade.As fan blade,Y Y-90-2-90-4,6,8 fan leaves,usually 2 is a series,4,6,8 is a series (gm).As emergency substitute,because the number of at the same time,not 2 can be very use tip of the leaf of fan use scissors to stator substitute,otherwise can't cover the upper hand.Remove the fan blade method series motor,generally with a long flat iron pry the class object (e.g.,flat file).After years of use,fan leaf aging is disassembled extremely fragile,be careful operation.Series motor high efficiency electric motor rotor fan www.facebook.com/guohong.trading blade available special Lamar spin out,also can use internal combustion engine valve down.