Introduction to temperature rise test of ruite stepping motor

by:V&T Technologies     2020-01-02
Stepping motors are widely used in motion control systems. Many users use stepping motors, and the temperature rise of stepping motors that are often fed back is relatively large. Why? How does ruite test the temperature rise of the motor? First of all, why is the temperature rise of stepping motor relatively large? Any motor will heat, but the temperature rise range is different. For stepping motors, the interior consists of iron core and winding coil. The winding has Resistance, which will cause loss when energized; If the current is not standard direct current or sine wave, harmonic loss will occur; The hysteresis eddy current of the magnetic core is smaller than that of the alternating magnetic field. Damage can be manifested in the form of heat, which will affect the efficiency of the motor. Stepping motors usually pursue positioning accuracy and torque output, with relatively low efficiency, large current and high harmonic components, and the frequency of alternating current also changes with rotating speed, therefore, the stepping temperature will increase and the motor will be relatively large. Second, the reasonable range of stepping motor temperature rise, allowing the degree of motor temperature rise depends on the internal insulation level of the motor. The general insulation grade of stepping motor is Class B, so only the internal temperature does not exceed 130 degrees, the motor will not be damaged, and the surface temperature will be lower than 90 degrees. Therefore, the surface temperature of the stepping motor is usually 60 degrees. Third, during the temperature rise test process, select the appropriate radiator according to the size of the motor base, and then connect the motor to the radiator. The motor is fixed on the bracket through the radiator. The shaded part between the bracket and the radiator is a nylon heat shield. Place the sensor on the surface of the motor, then drive the motor, test the surface temperature of the motor and record the data. TAG
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