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Torque Relationship Between Coupling and Motor

The concept of coupling torque and motor torque

Motor torque refers to the torque generated when the motor rotates. It describes the torque that the motor can output. It is one of the important parameters to measure the performance of the motor. The torque output by the motor is related to the provided voltage, current, power and other parameters, and also depends on the structure of the motor (generally, the larger the motor body size, the greater its torque), mechanical transmission devices and other factors (such as gears). box, coupling, etc.).
Coupling torque refers to the torque transmitted to the coupling and is an indicator of the transmission efficiency of the coupling. Couplings are used to connect the driving mechanism and the working mechanism, and transmit the torque generated when the motor rotates to the working mechanism. The torque transmission efficiency of the coupling is usually greater than 98%.

The relationship between the rated torque, maximum torque of the coupling and the output torque of the motor

When selecting a coupling, you need to check the rated torque in the product parameters. This value indicates the maximum torque the coupling can withstand. The torque of the motor needs to be calculated according to the specific usage conditions, taking into account the load characteristics and the rotation speed of the motor. You can refer to the torque curve of the motor itself.

Of course, the coupling also has a maximum torque. This parameter is similar to the instantaneous allowable torque of the gearbox. Both are a limit value, usually twice the rated torque, indicating the load that the coupling can carry in a short period of time. The maximum torque cannot be verified at this time, so it is not recommended to exceed the rated torque during use.

When selecting a coupling, consider the influence of load characteristics

In practical applications, the rated torque of the coupling should be greater than the torque of the motor. This is to ensure that the coupling can stably transmit the power and torque of the motor and prevent excessive load from causing normal operation or damage to the coupling. Moreover, due to the characteristics of stepper motors: rotation speed and torque are inversely proportional. Therefore, when selecting a coupling, the required coupling torque can be confirmed based on the actual operating speed of the motor.

Updated on: 28/02/2024

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