As a digital actuator, gear stepper motor is widely used in motion control system. Many users often feedback that the temperature rise of the gear stepper motor is relatively large when using the gear stepper motor. That let us understand the temperature rise of the stepping gear motor.
The reasons of temperature rise
Any motor will generate heat, but the temperature rise range is different. Corresponding to the gear stepper motor, the inside is composed of iron core and winding coil. There is resistance in the windings, and losses will occur when energized. This is what we often call copper loss. If the current is not a standard DC or sine wave, it will also produce harmonic losses. There is loss, which is called iron loss. Both copper loss and iron loss will be expressed in the form of heat, which affects the efficiency of the gear motor. Stepper motors generally pursue positioning accuracy and torque output. The efficiency is relatively low, the current is generally large, and the harmonic content is high. It also produces heat when the gear is engaged. The frequency of the alternating current also changes with the speed, so the temperature rise of the gear stepper motor is large.
Reasonable range of temperature rise of gear stepper motor
The extent to which the motor is allowed to heat depends mainly on the internal insulation level of the gear motor. The general insulation level of the gear stepper motor is Class B, so as long as the internal does not exceed 130 degrees, the motor will not be damaged, and the surface temperature will be below 90 degrees. Therefore, the surface temperature of the gear stepper motor is normal at 60 degrees.
Temperature rise test process
Select a suitable heat sink according to the size of the motor base, and connect the motor to the heat sink. The motor and the bracket are fixed by a heat sink, and the part between the bracket and the heat sink is a nylon insulation board. Place the sensor on the surface of the gear stepper motor, and then put the motor through the rated conditions to test the surface temperature of the motor.