Elevator Traction Machine Motors Are AC Motors and DC Motors

Elevator traction machine motors are AC motors and DC motors, traction motor is running up and down the elevator drive power source. Elevator is a typical potential energy load. According to the nature of the elevator, elevator traction motor should have the following characteristics: 1, frequent starting and braking can be: An hour in the operation of the elevator brake from more than 100 times the number normally, up to 180 ~ 240 times per hour, Therefore, the elevator motor should be able to frequent starting and braking, the work of intermittent cyclical work system. 2, the starting current low: In the gearless elevator machine with the squirrel-cage rotor AC motor design and manufacturing, although still low resistivity material guide section, but with the rotor short-circuit ring has a high resistivity material, the rotor winding resistance has increased. On the one hand reduces the starting current, the starting current to rated current of 2.5 to 3.5 times, thus increasing the allowable number of starts per hour; The other hand, due to short circuit the rotor end ring resistance is larger, which will help distribute the heat directly, the combined effect of the decline in motor temperature rise. And to ensure adequate starting torque, usually about 2.5 times the rated torque. However, compared with ordinary AC motor, the mechanical properties of hardness and decreased efficiency, slip also increased to 0.1 to 0.2. Mechanical properties of soft, so that speed range increases, and work in the stall torque, the motor does not cause burning. 3, low noise motor operation: In order to reduce noise motor operation, the use of sliding bearings. In addition, due to increase the effective diameter of the stator core and stator core lamination shape, etc. Are to make a reasonable deal. Source: elevator-control-traction.com