The JR type wound rotor motor starters, Alibaba VS than multi JR wound rotor motor starters VS HC JR type wound rotor motor starter [shop around] Network Big Three contrast JR JZR, YR, YZR three-phase wound rotor AC induction motor (also known as slip ring motor). Its rotor external resistance or reactance, in starting with high power factor and high starting torque, in the fields of metallurgy, machinery, chemicals, mining, building materials commonly used this motor to Drag the equipment. Parts fitted on the shaft of the motor slip ring, carbon brushes, a short-circuit loop frequency the rheostat and other electrical components to form a complete secondary loop system with the control box in the relay, AC contactor, motor shorting means for starting and running. The motor this work has the following disadvantages: 1, carbon brush is easy to wear, excessive consumption, the amount of maintenance, and affect the normal production. 2, between the brush and slip ring is easy to produce sparks, some places can not be used. 3, brush and slip ring friction and increased contact resistance, motor temperature rise. 4, the conductive powder is easily inhaled inside of the motor, it is a big hidden burning motor. The time relay runaway easy to burn out the AC contactor and frequency sensitive rheostat, resulting in downtime discontinued. The dedicated winding three-phase asynchronous motor starter just to overcome the above also shortcomings. It eliminates the need for slip rings, carbon brushes and secondary loop systems do not need spare parts, to reduce the amount of maintenance to ensure the safe operation of the motor, once installed, the long-term benefit, is currently a leading position in the domestic starter equipment. Controlled brushless motor starters working principle: the dedicated winding three-phase asynchronous motor starter is the evolution of the the BP4 type frequency sensitive rheostat work, it best magnetic circuit principle and the best magnetic material more than the original secondary loop system contact components electromagnetic loop through process innovation made a non-contact electromagnetic components, as the variable resistance startup starting equipment. Which utilizes the relationship of the motor during starting, the current frequency of the rotor with the rotor speed increases and reduces, the rotor speed changes from 0 to a rated speed Ne, the rotor frequency of the current from 50 Hz to smoothly down to l-2 Hz, starting The impedance from the largest to the smallest, is equivalent to the resistance of the rotor circuit externally from maximum to minimum, it can be automatically with the change in frequency of the rotor for smooth adjustment, it is an ideal starting device. Installation and maintenance: 1, first remove the motor shroud, slip ring, carbon brushes, brush box, brush box bracket and short-circuit ring device (some motor short-circuit loop device) and all the parts. 2, removing the slip ring, to prevent the subsequent wiring error occurs, the two conductors of the same phase should be tied. 3, with a vernier caliper, measure the motor shaft diameter and pore size of the starter, key width is the same key to higher dimensions, if any difference with the Company in a timely manner, in order to solve. 4 coated little grease or oil on the shaft keyway aligned with the axis of the starter key position, then the starter Tongbang gently tap to the assembled position, and is stuck with a wire retaining ring, to prevent the starter axially moving string.