The Brushless ring starter factory direct quality and cheap product introduction and characteristics 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. QXQ Brushless starter is also just overcome 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. Brushless ring starter working principle wsq3 the brushless no Kai starter is the the BP4 type frequency sense of the evolution of the rheostat work, it is best magnetic circuit principle and the best magnetic material original secondary loop system of multi-contact element electromagnetic circuit, consisting of 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. Use the scope and technical parameters where the original to adopt BPl frequency sensitive, the BP4 type frequency sense rheostat, resistance box starter JR JZR, YR, YZR three-phase wound rotor induction motor (except variable speed) can be used WSQ3 brushless no starter ring replacement, replacement of the same operating characteristics. Its equipped with the motor capacity in 380V/ll-280Kw,; 3KV, 6KV/200-560Kw between the use of the best. Drag devices, such as: ball mill, fans, air compressors, pumps, conveyors, rubber mixing machine, driving claw bucket hoist, oxygen machine, mill. Regardless Reversible Brushless rheostat starters, occasionally, can be used with more frequent starting. l, light-load starting: the Mst ≥ 0.6-0.8Me, Ist ≤ 3-3.5Ie the Tst ≤ 6S. 2 heavy start: MSt ≥ 1.6-2