Motor Starting Resistors

All kind of motors used in the industry draw high current (up to 6-12 times) until the they reach rated speed and rated torque if they are connected to the load. Such overcurrent may damage the engine as well as other system equipment. Motor starting resistors limit overcurrent and help the motor to reach the nominal speed in stages without drawing too high current.

With developing speed drives, motors can be started and controlled as requested. Aktif can design, manufacture and support the suitable motor starting resistor in terms of spare parts and replacements for current systems.

Motor starting resistors can be classified in two groups;

Stator Resistors

Serial connected and staged resistors are connected to the motor entry (stator side) of squirrel-cage asynchronous motor and DC motors to reduce the input voltage and resistors are switched off in stages through contactors to decrease the motor input voltage and balance the torque speed.

Rotor Resistors

Serial connected and staged resistors are connected to the rotor of a slip ring wound rotor asynchronous motors to increase the motor impedance. Resistors are switched off in stages through contactors to decrease the rotor impedance in stages and balance the torque speed.

Advantages

• Easy access and maintenance to the resistor blocks on site thanks to blocks independently mounted to the frame
• Special mechanical and electrical design to withstand high temperature and extreme current values

Application Areas

• Steel Industry
• Mining
• Cement Plants and Other Heavy Industry
• Rolling, Conveyor, Lifting, Breaking, Mixing and Pumping Applications