• The slip-ring motor 1 • The liquid resistance starter 2 • Demanding applications 2 • Conclusion 3 TECHNICAL NEWS Issue 13 Please circulate to LIQUID RESISTANCE STARTER DEVELOPMENTS The AC cage induction to the motor or the char-The slip-ring motor is the mainstay of acteristics of the motor electrical drive systems itself The slip-ring motor The motor has only one motor ,
Fig 1 Rotor resistance starter The external resistance is inserted in each phase of the rotor winding through slip ring and brush assembly Initially maximum resistance is in the circuit As motor gather speed, the resistance is gradually cut-off The operation may be manual or automatic
For certain types of electric motors or generators to function, the coils of the rotor must be connected to complete an electrical circuit Originally this was accomplished by affixing a copper or brass commutator or 'slip ring to the shaft, with springs pressing braided copper wire 'brushes' onto the rings which conduct the current Such brushes provided ,
By correctly selecting the resistors used in the secondary resistance or slip ring starter, the motor is able to produce maximum torque at a relatively low current from zero speed to full speed A secondary use of the slip ring motor, is to provide a means of speed control Because the torque curve of the motor is effectivley modified by the ,
Liquid Resistance Starter These are used for inserting external resistance in the rotor - circuit of slip ring induction motor at the starting to reduce starting - current and increase starting - torque used in various industries and installations like : cement plants, rolling mills , pumping plants, sugar mills, paper plants we manufacture .
Electrolytic starter (LRS) for high power slipring motors ,
Why using a starter for slip ring motors In order to start a slip ring motor, the accelerating torque has to be sufficiently higher than the resisting torque Higher is the inertia, higher has to be the accelerating torque, otherwise the start will be very long and the motor can be damaged by the heating
theory of slip ring induction motor with liquid starter
The slip ring or wound rotor motor is an induction or they can be liquid Can I Bridge out the slip rings and use a soft starter on a slip ring motor? Induction motor - Wikipedia Large slip ring motor in theory, induction motors and thus, with constant voltage input, a low-slip induction motor''s percent-rated maximum torque
What are the type of starter used for slip ring induction ,
Depending on type of workload there are various type of starters for a slip ring induction motor Starters limit the starting current in an induction motor which goes 5–6 times of full load current as slip remains 1 The starters are 1 Star-Delta.