How to choose a cost-effective stepper motor and driver?

by:V&T Technologies     2019-12-31
How to choose a stepping motor and driver with high cost performance? As there are many types and types of stepping motors and drivers, users should pay attention to them when choosing, in this way, you can choose the products you need with the best performance and the lowest price. Today, I will give you some reference for selection, hoping to help. Selection principle: 1. First, determine the torque required by the stepping motor to drag the load. The simplest method is to add a lever to the load shaft and pull the lever with a spring balance. The pulling force multiplied by the length of the Force arm is both the load torque. Or calculated theoretically according to the load characteristics. Since the stepping motor is a control motor, the maximum torque of the commonly used stepping motor is not more than 45Nm. The larger the torque, the higher the cost. If the motor torque you choose is larger or exceeds this range, you can consider adding a deceleration device. 2. Determine the maximum running speed of the stepping motor. The speed index is very important in the selection of stepping motor. The characteristic of stepping motor is that the torque decreases with the increase of motor speed. The speed of decrease is related to many parameters, such: the driving voltage of the driver, the phase current of the motor, the phase inductance of the motor, the size of the motor, etc. , the general rule is: the higher the driving voltage, the slower the torque drop; The larger the phase current of the motor, the slower the torque drop. In the design scheme, the rotating speed of the motor should be controlled within 600 rpm or 800 rpm. Of course, this is not standard. Please refer to moment-Frequency characteristics 〉. 3. According to the two important indexes of load maximum torque and maximum rotation speed, refer to moment- Frequency characteristics>, you can choose a suitable stepping motor. If you think that the motor you choose is too large, you can consider adding a speed reducer, which can save costs and make your design more flexible. To choose the appropriate reduction ratio, we should comprehensively consider the relationship between torque and speed and choose the best scheme. 4. Finally, we must consider leaving a certain amount (Such as 50%)Torque margin and speed margin. 5. Hybrid stepping motor can be selected first, and reactive stepping motor can be selected if due to price factors. 6. Try to select the subdivision step driver and make the driver work in the subdivision state. 7. When selecting, don't go into the misunderstanding of only looking at the torque of the motor, that is to say, the larger the torque of the motor, the better, and consider it together with the speed index. 8. The ultra-small driver and the micro-driver use the shell as the radiator and should be fixed on a larger and thicker metal plate or an external fan to dissipate heat. If there is no heat dissipation condition, and the driver works at a lower speed (At this time, the drive is hot) Can be replaced by a 90-type driver with a fan. I hope these selection principles can be helpful to everyone. What other selection principles do you know? Welcome to leave a message to share with us, Related reading: Characteristics of stepping motor driver, selection details of servo motor and stepping motor, selection of industrial motor to TAG stepping motor driver
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