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Belt drive, what are the special restrictions on motor power?

Date:2023-09-27   Author:XINDA MOTOR

Belt drive is always a common way of motor operation. In view of the impact of belt drive on the performance of the motor body, considering the stability and service life of the motor performance, especially for motors with larger power, it is not recommended to use this drive. 

In the product technical conditions of standard motors, 37kW is generally defined as the power of belt drive, that is, motors with power exceeding 37kW should avoid using belt drive as much as possible. Belt drive has relatively great convenience, but some of its inherent shortcomings should still attract the attention of motor manufacturers and users: such as the impact of belt wear and aging on the motor transmission effect, and the impact of large bending moment on the motor shaft. 

When starting the belt conveyor of the belt drive equipment, the tensioning force is required to be 1.4 to 1.5 times greater than the tensioning force during stable operation, so the tensioning force of the belt conveyor can automatically increase when starting. When braking, there is often a large impact, so the tensioning device is required to respond quickly to minimize the impact. For long-distance, large-elasticity belt conveyors, shutdown is more dangerous than acceleration, and control is more difficult.

However, for some specific operating conditions, such as crusher motors, belt drive is used in most cases. The strict power limit obviously severely restricts the power range of this type of equipment. In order to improve the overall power level of the equipment, all necessary The performance of the matching motor meets the needs of this working condition, that is, the final use requirements are achieved through the performance improvement of the bearing system and rotating shaft.

Generally speaking, when a larger power motor is used in working conditions similar to a crusher, especially when a belt is used, the enhancement measures adopted mainly include adjustments to the performance of the bearing system and the rotating shaft.

Through actual fault cases, it can be found that when motors using deep groove ball bearings at the shaft extension end are used in crusher equipment, the bearings are prone to falling apart, while motors using cylindrical roller bearings can better meet this requirement. working conditions. The problem of shaft breakage in this type of working conditions is also relatively large. Through quenching and tempering and other measures similar to the shaft casting process, the applicability of the motor to this type of working conditions is greatly improved, which naturally increases the power range of the belt drive motor.