Which six conditions should be met when selecting a geared motor?

Which six conditions should be met when selecting a geared motor?

The geared motor is subjected to two forms of torque: constant load torque and cutting torque (including friction torque); acceleration/deceleration torque. The calculation methods of these two kinds of torques and the conditions that should be satisfied when selecting the motor are described below.

Condition 1

When the machine is running without load, the torque applied to the motor should be less than 50% of the continuous rated torque of the motor. Otherwise, the motor may overheat during cutting or addition/deceleration/speed.

Condition 2

The addition (decrease) speed is short and must be within the allowable range of the motor. Usually, the load torque helps the deceleration of the MALV motor, so if the acceleration can be completed within the allowable time, the deceleration can be completed in the same time. In this way we only need to calculate the acceleration torque and calculate the torque in the discontinuity of the mechanical characteristics of the motor at the allowable time.

Condition 3

Frequent positioning and acceleration/deceleration will cause the motor to heat up. At this time, it is necessary to calculate the root mean square value Trms of the torque that the motor is subjected to, which is smaller than the rated torque Tc of the motor.

Condition 4

When the load fluctuates frequently, the root mean square value Tmrs of the load torque of one duty cycle is calculated to be smaller than the rated torque of the motor.

Condition 5

The motor should run at the maximum cutting torque for a period of time within the allowable range.

Condition 6

The inertia of the load is less than 3 times the inertia of the motor itself (recommended 2.5 times).

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