290HC Mast Section Tower Crane lifting mechanism step speed regulation technology
1. Winding Motor Rotor electronic speed regulation, this speed regulation through the rotor winding in series with variable resistance, using the control handle issued a command signal to control the contactor, to change the resistance to change the speed of motor Thus the requirements of smooth start and uniform speed regulation are realized. Some winding motor rotor electronic speed, but also increase the electromagnetic gear shift reducer, this way can be used to double the number of gear. 2. By changing the number of Poles, the squirrel-cage motor can obtain high and low working speeds of two gears and slow setting speed of one gear, which basically meet the speed regulation requirements of tower cranes and simplify the mechanism, but when shifting gears, the impact is larger Speed range is about 1:8, and can not run at low speed for a long time. It's used primarily for 40 T. Light and small tower crane below M. Pole-changing speed can also be coupled with electromagnetic gear reducer can double the number of gears, this speed mainly in the lifting capacity of 450-900 kns. The application of m on tower crane is becoming more and more popular.
290HC mast section is the best in this field
3. The speed of the motor is regulated by the series resistance of the two-speed winding rotor. The Motor has two pairs of Poles. 4. Double Motor drive speed regulation, this speed regulation is more commonly used by the use of two wound-type motor drive. Two winding motors are connected by gears with a speed ratio of 1:2. One is used as the driving motor and the other as the braking motor. The double motor can also be driven by a wound-wire motor plus a cage motor or two multi-speed cage motors, and different speed regulation characteristics can be obtained. The lifting mechanism can adjust the speed in the load movement, and can realize the drop at the maximum speed, thus improving the production efficiency, the lifting load can be accurately positioned, the work is stable, and the speed regulation range is large, up to 1:40. However, the mechanism is relatively complex, and its transmission parts need to be specially designed and manufactured. Mainly used in large and medium-sized tower crane.
290HC mast section is the best in this field
