The holding torque is also called the static torque, which refers to the moment at which the stator locks the rotor when the stepping motor is energized but does not rotate. Since the torque of the stepping motor at low speed is close to the holding torque, the torque of the stepping motor is rapidly attenuated as the speed increases, and the output power also changes with the increase of the speed, so the holding torque is a measure of the stepping. One of the most important parameters of the motor load capacity. First, choose to maintain the torque holding torque is also called static torque, which refers to the moment when the stepper motor is energized but does not rotate, the stator locks the rotor. Since the torque of the stepping motor at low speed is close to the holding torque, the torque of the stepping motor is rapidly attenuated as the speed increases, and the output power also changes with the increase of the speed, so the holding torque is a measure of the stepping. One of the most important parameters of the motor load capacity. For example, the stepping motor of 1N.m is generally mentioned without explanation, and it can be understood that the holding torque is 1N.m.
Second, the selection of phase two-phase stepping motor is low in cost, the step angle is at least 1.8 degrees, the vibration is high at low speed, the torque is fast at high speed, suitable for high speed and low accuracy and stability requirements; three-phase The stepping motor has a step angle of at least 1.2 degrees, the vibration is smaller than the two-phase stepping motor, and the low speed performance is better than the two-phase stepping motor. The maximum speed is 30 to 50% higher than that of the two-phase stepping motor, which is suitable for high speed and The accuracy and stability requirements are high; the 5-phase stepping motor has a smaller step angle, and the low-speed performance is better than the 3-phase stepping motor, but the cost is high, suitable for the middle and low speed sections and requires high precision and stability. The occasion.
Third, the choice of stepper motor should follow the principle of selecting the motor after selecting the motor first, first clear the load characteristics, and then compare the static torque and the torque frequency curve of different types of stepper motors to find the stepper motor that best matches the load characteristics; accuracy requirements When high, mechanical deceleration should be used to make the motor work in the most efficient and lowest noise state; avoid working the motor in the vibration zone, if necessary, by changing the voltage, current or increasing the damping; 57 motor adopts DC 24V-36V, 86 motor adopts DC 46V, 110 motor adopts higher than DC 80V; large moment of inertia load should select motor with larger frame number; when large inertia load and working speed are higher, motor should be used Gradually increase the frequency to prevent the motor from losing the step, reduce the noise, and improve the positioning accuracy when the motor is stopped. In view of the fact that the stepping motor torque is generally below 40Nm, beyond this torque range, and the running speed is greater than 1000RPM, the servo motor should be considered. The general AC servo motor can run normally at 3000RPM, and the DC servo motor can run normally at 10000RPM.
4. It is better not to select the whole step state for selecting the driver and the subdivision number, because the vibration is larger in the whole step state; try to select the driver with small current, large inductance and low voltage; use the driver larger than the working current, and need low vibration Or use high-precision drive with high-precision drive, high-voltage drive for high-torque motor to achieve good high-speed performance; where the actual motor speed is usually high and the accuracy and stability are not high, It is not necessary to select a high-resolution driver to save cost; in the case where the actual motor speed is usually low, a larger number of subdivisions should be used to ensure smooth operation and reduce vibration and noise; in short, when selecting the subdivision number The actual operating speed of the motor, the range of the load torque, the setting of the reducer, the accuracy requirements, the vibration and noise requirements should be considered.
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