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目前在起重机上采用的电气驱动系统不能保证平稳的无级调速。而起重机的货物起升与下降速度、旋转以及运行速度都极需调节,因为这与提高安装起重机的使用质量和改善其工作规范紧密相关。比较简单而有效的调速装置是在传动系统中采用电磁离合器。这种离合器使电动机便于起动与加速。省掉控制器、包括起动继电器的控制屏以及电阻箱等起动装置,使得在驱动系统内可以使用由按钮操纵的鼠笼电机电磁离合器是一个挠性的联结元件。它保证平稳且无冲击的起动,保护电动机和超重机各机构免于过载,从而延长其使用寿命。同时,可以省略掉极限转矩离合器,因为电磁离合器本身可以更有效地完成后者的任务。
The current electric drive system used on cranes can not guarantee a smooth stepless speed regulation. Crane crane lifting and lowering speed, rotation and operating speed are extremely adjusted, because it is to improve the quality of the installation of cranes and improve their work practices are closely related. More simple and effective speed control device is used in the transmission system electromagnetic clutch. This clutch makes the motor easy to start and accelerate. Eliminating the controller, including the control panel for the starter relay and the starting device such as the resistor box, makes it possible to use the button-actuated squirrel-cage motor in the drive system. The electromagnetic clutch is a flexible coupling element. It guarantees a smooth and impact-free start-up, protecting the motor and overweight mechanisms from overloads, thus extending their service life. At the same time, the ultimate torque clutch can be omitted because the electromagnetic clutch itself can accomplish the latter’s tasks more efficiently.