AC wound rotor motor soft starter 

 

1)Main function:

1:smooth start, without shook to equipment, extend the using life,save equipment maintain cost

2:reduce the  temperature increasing of motor, largely extend  the long of motor,

3:save the electricity power

 

2)range of application:

suitable to heavy load soft starting of wound rotor asynchronous motor,

especially in industrial or mines with unstable or lower voltage

 

Successfully widely used by Three Georges project, national engineering designing institute, mining company, cement mill, stell mill,sugar factory,wood industry, chemical industry, city planning, and other place with big power motor and high electric consume place.

 

3)unique feature:

1:it start smoothly, no mechanic pulse on the machine and a longer working life to both equipment and motor

reduce motor starting temperature rise, effectively lengthen the motor's life

 

2:the cabinet and water tank adopt a full-closed structure, which can avoid evaporating of the electrolyte,lengthen the equipment working life and reduce the mantaining frequency.

 

3:it can start under a lower voltage, for example, start in 5.5KV when rated voltage 6KV

 

4:the equipment is also suitable to be long time used in climate of less than 200mm raning yearly

 

5:with a cycle pump, a unique automatic cycle colling system designed for this product, can release the leat in the tank in very short time

 

6: can started continuously for 5-10 times

 

7: adpts worm gear and worm lifter as the transformation tool, which is stable,reliable and noiseless

 low starting current: the starting current is<= 1.3Ie(A)

 

8: the equipment has reliable cabinet struction, which is wholly automatically operated and convenient to be installed and maintained.

 

4)operating principle:

For wound rotor asynchronous motor, when the grid voltage and frequency are invariant,

the connection of the starting resistor  to the rotor loop will reduce the starting current and get a larger starting torque.

  

putting special compound electrolyte into the rotor loop of the  controlled winding motor as the liquid resistance, when the stator receive the signal of the motor starting,  it will change the location of the electrolyte automatically, so as to reduce the resistance value gradually. when the resistance reached the minimum level, the sensor closed and motor rotor star connected directly, then the equipment start smoothly with a low current, large torque.