In specific applications, when the terminal load is stable, the action is simple, and the operation is basically low-speed, the most suitable choice is a stepper motor that is low-cost and easy to control. However, when the terminal load fluctuates within a large range, the action is simple, and the operation is basically low-speed, if a stepper motor is chosen, a series of problems will arise because stepper motors driven by square waves are difficult to eliminate vibration and noise, and may experience step loss or overshoot due to torque fluctuations.
However, what issues should be considered when replacing stepper motors in a product with servo motors?
A. To ensure minimal changes to the control system, a digital servo system should be selected, while the original pulse control method can still be used;
B. Since servo motor manufacturers have a certain overload capacity, when selecting a servo motor, one can use 1/3 of the output torque of the stepper motor to determine the rated torque of the servo motor.
C. The rated speed of a servo motor is much higher than that of a stepper motor. To fully utilize the performance of a servo motor, it is best to add a speed reduction device so that the servo motor operates at a speed close to its rated speed. This also allows for the selection of a motor with lower power, thereby reducing costs.
1. Installation method
Unless otherwise specified, the motor should be mounted axially and horizontally on the standard test bracket specified in GB/T7345 during testing. The servo drive should be installed according to the normal operating conditions specified in the product's specific technical specifications, and the drive should be installed and tested in a manner that simulates its actual usage position as much as possible.
2. Servo driver ambient temperature
(1) Operating temperature: -10℃ to +40℃;
(2) Storage temperature: -25℃ to +65℃;
(3) Vibration/shock: Vibration is 0.5g (4.9m/s2), and shock is 2g (19.6m/s2).
(4) Ambient humidity: 5%~90%, no condensation occurs;
3. Environmental conditions
(1) Standard altitude: below 2000m (above 2000m, the volume is reduced by 20% for every 1000m increase);
(2) Structure: Wall-mounted, open structure;
(3) Cooling method: self-cooling/forced air cooling:
(4) Working hours: Continuous work S1; Short-time work S2, 30 min; Continuous periodic work S6, 40%;
(5) Power circuit control mode: three-phase/single-phase full-wave rectification, IGBT-PWM mode, sinusoidal current control, drive frequency 15kHz/8kHz/4kHz;
Many customers mistakenly believe that servo motors and stepper motors are largely the same and have similar applications. However, this is not the case; there are significant differences, and the choice should be made based on the specific application. In fact, when the terminal load fluctuates significantly, even in low-speed operation, a servo motor should be chosen. This is because, considering factors such as improved efficiency, energy saving, enhanced control precision, and increased system stability, the higher price of a servo motor actually improves the overall cost.
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