How to choose a stepper motor according to the specific situation?

How to choose a stepper motor according to the specific situation?

There are many selection methods for stepper motors and drives, but the selection of stepper motors should follow the principle of selecting the motor first and then selecting the stepper motor driver, first clarify the load characteristics, and then find the stepper motor that best matches the load characteristics by comparing the static torque and torque-frequency curves of different types of stepper motors. The following stepper motor engineer recommends the following stepper motor selection methods:

1. The selection of stepping motor torque

The holding torque of the stepper motor is similar to the “power” called by the traditional motor. Of course, there is an essential difference.

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The physical structure of the stepper motor is completely different from the AC and DC motors, and the output power of the motor is variable. Generally, depending on the amount of torque required (that is, the torque of the animal body to be carried), the type of motor is selected.

Roughly speaking, the torque is below 0.8N.m, choose 20, 28, 35, 42 (the diameter or square degree of the motor body, unit: mm); If the torque is about 1N.m, it is more appropriate to choose a 57 motor. In the case of torque of several N.m or more, it is necessary to choose a stepper motor with specifications such as 86, 110, 130, etc. Contact WeChat or WhatsApp: +8618062443671

2. The selection of the speed of the step motor should also be given special consideration to the speed of the motor.

Because the output torque of the motor is inversely proportional to the speed. That is to say, the torque of the stepper motor at low speed (hundreds of revolutions per minute or lower, its output torque is large), and the torque (1000 rpm – 9000 rpm) in the high-speed rotation state is very small.

Of course, some working environments require high-speed motors, and the coil resistance, inductance and other indicators of the stepper motor should be measured.

Choose a motor with a slightly smaller inductance, as a high-speed motor, which can obtain a large output torque. On the contrary, in the case of low speed and strong torque, it is necessary to choose an inductor in the tens or tens of mH, and the resistance should be larger.

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3. No-load starting frequency selection

Selection of no-load starting frequency of stepper motor, usually referred to as “empty starting frequency”.

This is an important indicator for purchasing a motor. If frequent starts, stops are required in an instant, and the speed is around 1000 rpm (or higher), “accelerated start” is usually required. If direct start is required to achieve high-speed operation, it is best to choose a reactive or permanent magnet motor. The “empty starting frequency” of these motors is relatively high.

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4. The number of phases of the stepper motor selection

The number of phases of the stepper motor is selected, this content, many customers pay little attention, most of them are casually purchased. In fact, the working effect of motors with different phase numbers is different. The more phases, the smaller the step angle can be made, and the vibration during operation is relatively small. In most cases, two-phase motors are used more. In the high-speed and high-torque working environment, it is more practical to choose a three-phase stepper motor.

5. The working environment of the stepper motor is waterproof and oilproof

For the use environment of the stepper motor, the special stepper motor can be waterproof and oilproof, and is used in some special occasions.

For example, underwater robots need to discharge water motors. For special-purpose motors, it is necessary to select them accordingly. Our company provides customized waterproof motors

6. Stepper motor shaft exit mode, diameter, length and short specification selection

According to your actual situation, whether you need special specifications and special specifications of stepper motors, please communicate with our Times Chaoqun factory main store, within the scope of technology permitting, processing orders. For example, the diameter, length, extension direction of the shaft, etc.

7. Pre-sales stepper motor technical consultation

If necessary, you can further communicate and confirm the model with our servo stepping technology engineer. Our company provides motor + drive + deceleration + control and other all-round services.

You can choose a stepper motor according to the above steps, or you can select a motor through the following steps.

How to choose a stepper motor? The 7 steps of stepper motor selection are essential!

When selecting a stepper motor, you can choose according to the following steps, which can avoid the trouble caused by improper selection. The details are as follows, for reference only.

1. Selection of stepping motor torque

The holding torque of a stepper motor is similar to what a conventional motor calls “power”. Of course, there is an essential difference. The physical structure of the stepper motor is completely different from the AC and DC motors, and the output power of the motor is variable.

Generally, depending on the amount of torque required (that is, the torque of the animal body to be carried), the type of motor is selected.

Roughly speaking, the torque is below 0.8N.m, choose 20, 28, 35, 39, 42 (the diameter or square degree of the motor body, unit: mm); If the torque is about 1N.m, it is more appropriate to choose a 57 motor. In the case of torque of several N.m or more, it is necessary to choose a stepper motor with specifications such as 86, 110, 130, etc.

Stepper motor driver 256 subdivision

2. Selection of stepper motor speed

Special consideration should also be given to the speed of the motor. Because the output torque of the motor is inversely proportional to the speed. That is to say, the torque of the stepper motor at low speed (hundreds of revolutions per minute or lower, its output torque is large), and the torque (1000 rpm – 9000 rpm) in the high-speed rotation state is very small.

Of course, some working conditions require high-speed motors, and it is necessary to have coil resistance, inductance and other indicators of stepper motors

Measure. Choose a motor with a slightly smaller inductance, as a high-speed motor, which can obtain a large output torque. On the contrary, in the case of low speed and strong torque, it is necessary to choose an inductor in the tens or tens of mH, and the resistance should be larger.

3. Selection of no-load starting frequency of stepper motor

The no-load starting frequency of stepper motors, commonly referred to as the “empty starting frequency”. This is an important indicator for purchasing a motor. If frequent starts, stops are required in an instant, and the speed is around 1000 rpm (or higher), “accelerated start” is usually required.

If direct start is required to achieve high-speed operation, it is best to choose a reactive or permanent magnet motor. The “empty starting frequency” of these motors is relatively high.

4. Phases selection of stepper motor

The choice of the number of phases of the stepper motor, this content, many customers pay little attention, mostly casually purchased. In fact, the working effect of motors with different phase numbers is different. The more phases, the smaller the step angle can be, and the vibration during work is relative

Smaller. In most cases, two-phase motors are used more. In the high-speed and high-torque working environment, it is more practical to choose a three-phase stepper motor.

2 Phase Stepper motor driver subdivision

5. Use the environment to choose

For the use environment of the stepper motor, the special stepper motor can be waterproof and oilproof, and is used in some special occasions.

For example, underwater robots need to discharge water motors. For special-purpose motors, it is necessary to select them accordingly.

6. Can you need special specifications according to your actual situation

For special specifications of stepper motors, please communicate with us and process orders within the scope of technology. For example, the diameter, length, extension direction of the shaft, etc.

7. If necessary, it is best to communicate and confirm the model with the manufacturer’s technical engineer

If necessary, it is best to communicate further with the manufacturer’s technical engineers to confirm whether the stepper electromechanical you want to choose can meet the indicators you require in all aspects.