The shortcomings of the old control mode

The shortcomings of the old control hoist crane is compact, lightweight, easy operation, low cost, wide range of USES. It with a conical rat cage motor as an ascending motor and the car running, cart is usually with squirrel cage motor drive. Hoist crane, there are some inevitable shortcomings, such as the large starting current, the braking impact big, easy create frame and the shaking and the deflection of the cargo; Point move too much, motor overheating, easy to cause broken shaft, motor, reducer and wear accidents burn out. So looking for a good starting and manual hoist control method is very meaningful. Hoist crane all faults are from cage motor control method, because it is direct starting, the starting current is rated current of the 5 ~ 7 times, reverse braking cannot overcome reducer gear clearance between the impact of. For big inertial system, the organization in the process of starting motor under maximum load and maximum torque is chainb lock proportional to the clearance between teeth and gear reducer. At present, the hoist crane often operation, with a push button switch point moving frequently, the motor easy to fever. To make up for the defects, and expand the motor capacity is often used to choose the way. Thus increase the supporting capacity of the motor, at the same time, in order to avoid the broken shaft and broken teeth, and increase the capacity of the gear reducer. From the point of the model characteristics of conventional control, old-fashioned control mode is stumping while saving money, but later use performance is poor, large energy consumption.