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What are the essence and advantages of direct motor drive?

Drive is a necessary part of the operation of the electric motor. The driving mode of the motor varies according to the actual equipment being dragged; except for variable frequency motors, the speed of industrial frequency motors is a relatively fixed speed depending on the number of poles, and the speed of the equipment being dragged may not coincide with the speed of the equipment being dragged. The speed of the motor is consistent. For example, some equipment has a very slow speed, while some equipment requires a higher speed. When the equipment speed is inconsistent with the motor speed, it is necessary to convert the speed through a necessary transmission device, such as a belt drive. , gear transmission, etc.
Direct drive motor is the abbreviation of direct drive motor. It means that when the motor drives the load, it does not need to pass through the transmission device, such as transmission belt, speed reducer, etc.


For devices using direct drive, some advantages can be realized:

First, the direct drive motor does not need to transmit power through the transmission device, which reduces the transmission loss caused by the transmission device, improves energy utilization, and the system energy saving effect is better;

Second, since there is no influence from the transmission device, the direct drive motor has high rotation accuracy and stability, and is suitable for equipment with high position and speed requirements;

Third, in comparison, direct drive motors have a simple structure, which reduces the probability of mechanical failure and facilitates maintenance;

Fourth, since the direct drive motor does not require a transmission device, it can directly respond to the drive signal, the speed adjustment response speed is fast, and the equipment operates more directly. During the energy-saving transformation of the equipment system, the overall energy-saving effect is very impressive through the adjustment of the driving mode.

Compared with other driving methods, with direct drive transmission, the rotation speed of the equipment is the same as that of the motor, and the torque transmitted to the equipment does not change. For a motor with the same power, when transmitted through a reduction device, the transmission speed decreases but the torque increases, while for a motor with an accelerating device, the speed it reaches increases but the torque decreases.

In the actual application of motors, transmission through reducers is more common, that is, the reduction device is used to achieve the overall requirement of low speed but large torque; and for particularly low-speed motors, there are some difficulties in motor design and manufacturing. However, variable frequency motors and synchronous motors have solved this problem better, such as low-speed direct-drive motors.