[YZR-wound rotor motor starters] new price list in October 2012, a first-come-first-served basis Jr., JZR, YR, YZR, three-phase wound rotor AC induction motor (also known as slip ring motor). Since its rotor external resistance or reactance, high power factor and high starting torque at start, in the fields of metallurgy, machinery, chemicals, mining, building materials commonly used in this motor to Drag the device. Slip ring, carbon brushes, short-circuit ring is mounted on the motor shaft parts, they relay in the control box, AC contactor, frequency sensitive rheostat and other electrical components to form a complete system of the secondary circuit, as motor starting and means of running shorting. This way of working of the motor has the following disadvantages: 1, carbon brush is easy to wear, excessive consumption, the amount of maintenance, and affect the normal production. Between brush and slip ring is easy to produce sparks, some places can not be used. 3, brush and slip ring friction, increases the contact resistance, the motor temperature rise. 4, conductive powder is easily inhaled inside the motor and is a serious hazard of burning motor. 5, 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 starters just to overcome the above shortcomings. It eliminates the need for slip rings, carbon brushes and secondary loop system, no spare parts, reduce the amount of maintenance, to ensure the safe operation of the motor, once installed, is currently a leading position in the domestic long-term benefit starting equipment. Brushless motor starters it works: dedicated winding three-phase asynchronous motor starter the BP4-frequency sensitive rheostat the evolution of the work, which uses the best magnetic circuit principle and the best magnetic materials the original secondary loop system multi- contact components of the electromagnetic circuit, through process innovation made of a non-contact electromagnetic components, variable resistance as the startup starting equipment. It by the motor during starting, the rotor current frequency with the rotor speed increases and reduces the relationship, i.e. the rotor speed changes from 0 to the nominal rotational speed Ne, the rotor current frequency from 50 Hz to smoothly reduced to l-2 Hz, STARTING impedance by the maximum displacement to a minimum, equivalent to the resistance of the rotor circuit external from maximum to minimum, it can be automatically attached to the rotor frequency change for smooth adjustment, it is an ideal starting device. Installation and maintenance: 1, first remove the motor shroud, slip rings, carbon brushes, brush box, brush box bracket and short circuit ring device (some motor short-circuit ring device), and all other parts. Demolition of slip ring, to prevent later wiring errors, the same two wires should be tied together. 3, with a vernier caliper, measure the motor shaft diameter and pore size of the starter, key pitch, the key to higher dimensions are the same, if any difference, with the company in a timely manner, in order to solve. Lightly grease or oil on the shaft keyway alignment of the starter shaft key, and then copper rod starter gently tap to the assembly position, and stuck with a wire ring to prevent starter axial move. 5, assembly, should not knocking Cookin, so as to avoid damage to internal parts or leaking. Starter finished assembly