Saturday, July 27, 2024

How to choose and judge the quality of integrated stepper motors

1.Introduction

An integrated stepper motor refers to a design that integrates the driver and stepper motor of a stepper system into one. This design not only greatly saves installation space, but also simplifies the cumbersome wiring process and enhances the practicality of the stepper system. Integrated stepper motors usually inherit the excellent characteristics of control and drive in one, saving design costs and time costs for customers, and are suitable for customers to choose stepper system solutions


2.Methods for selecting suitable integrated stepper motors

1.Selection of step angle: The step angle depends on the requirements of load accuracy. Convert the minimum resolution of the load to the motor shaft, and the angle that each equivalent motor should walk. The step angle of the motor should be equal to or less than this angle. Common step angles on the market are 0.36 degrees/0.72 degrees, 0.9 degrees/1.8 degrees, 1.2 degrees, etc.

2.Selection of static torque: The basis for the selection of static torque is the load of the motor, including inertial load and friction load. The static torque should be 2-3 times the friction load. Once the static torque is selected, the motor base and length can be determined.

3.Current selection: Motors with the same static torque have very different operating characteristics due to different current parameters. The current of the motor can be determined based on the torque-frequency characteristic curve.

4.Speed ​​and accuracy: When the speed requirement is high, a motor with a larger phase current and a smaller inductance should be selected to increase the power input, and a higher supply voltage should be used when selecting the driver. Determine the requirements for positioning accuracy and vibration, and determine whether and how many subdivisions are required.

5.Special specifications and environmental adaptability: If a stepper motor with special specifications is required, such as the diameter, length, and extension direction of the output shaft, it is usually necessary to communicate with the manufacturer and customize it within the scope allowed by technology. For special environments, such as waterproof and corrosion-resistant stepper motors, they are suitable for certain special occasions. For example, underwater robots require waterproof motors. ‌


3.Methods for judging integrated motor failure

1.Check insulation resistance: Use an insulation resistance megohmmeter to measure the insulation resistance of the motor. If the insulation resistance is greater than 0.5 megohms, it means that the insulation performance of the motor is good. ‌

2.Test DC resistance: Use the resistance range of a multimeter to test the DC resistance of the three windings of the motor. If the DC resistance of the three windings is similar and the deviation is small, it means that there is no inter-turn short circuit in the winding. ‌

3.Manual rotation test: Without connecting any equipment or wires, manually rotate the motor shaft. If it rotates smoothly and there is no jamming, it means that the motor is normal. ‌If jamming or failure to rotate occurs, it may indicate that the motor is broken or there is an internal problem. ‌

4.No-load power-on test: Power on the motor and observe whether the three-phase current is balanced and whether the motor rotates smoothly. Pay attention to abnormal conditions such as temperature rise and abnormal noise of the motor. ‌

5.Check the stepper motor driver: If the red light of the stepper motor driver keeps flashing, it may be that the power supply voltage is unstable or there is a problem with the control signal. Use a multimeter or other instrument to check the power supply voltage and control signal, and also check whether the stepper motor itself has any faults.

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