What are the elements of stepper motor procurement?

General Motor Procurement Elements:

First, determine how much torque is needed to meet the need, how much n, m;

Second, determine the flange of the motor, which is the size of the motor base to ensure that the equipment can be installed;

Third, determine what are the special requirements of the shaft, determine the length, diameter and keyway of the shaft;

Fourth, determine the speed of the motor, the characteristics of the stepper motor are that the lower the speed, the greater the torque;

Fifth, determine how many phases the motor is, which is related to your electricity consumption;

Sixth, determine the step angle of the motor;

Seventh, determine product quality (factory packaging, quality inspection), ** and after-sales and payment methods, etc.

From the products purchased in the past, I personally feel that the quality of the stepper motor and drive of Zhongke servo is not bad, and it is also fair and can be purchased!

The selection of stepper motor is based on the size of the torque; Select the number of phases of the motor, whether it is two-phase (step angle, three-phase (step angle or five-phase (step angle; The rated speed of the motor when working, the speed of the general stepper motor is hundreds of revolutions, and the reducer can be equipped if the torque is relatively large; These are all aspects of performance, I think the most important thing is to consider the procurement, quality, delivery time, payment method and after-sales problems, otherwise the problem is also to cause trouble for yourself.

Stepper motor does not talk about power, number of pole pairs, voltage, etc. The recommendations are as follows:

1: The installation method of the motor is installed vertically or horizontally.

2: Transmission mode This is good to calculate thrust or torque.

3: Calculate the speed according to the requirements (the speed of the stepper motor will not be very high, only a few hundred revolutions) 4: Calculate the required torque When selecting the stepper motor, it is best to choose a torque greater than 30-50% of the required torque

5: Other precautions are environmental factors and other factors.

For the time being, there are many missing places, I hope you will add thank you!

The stepper motor is composed of three elements: step angle (involving the number of phases), static torque, and current. Once the three elements are determined, the basic model of the stepper motor is determined.

1. The selection of the step angle.

The step angle of the motor depends on the requirements of the load accuracy, the minimum resolution (equivalent) of the load is converted to the motor shaft, and how many angles (including deceleration) should be taken by each equivalent motor. The step angle of the motor should be equal to or less than this angle. At present, the step angle of stepper motors on the market generally has degrees (five-phase motors), degrees (two-phase and four-phase motors), degrees of 3 degrees (three-phase motors), etc.

2. Selection of static moment.

The dynamic torque of the stepper motor is difficult to determine all of a sudden, and we often determine the static torque of the motor first. The static moment is selected based on the load under which the motor works, and the load can be divided into two types: inertial load and friction load. A single inertial load and a single frictional load do not exist.

When starting directly (generally by low speed) when the two kinds of load are considered, the inertial load is mainly considered when accelerating starting, and the friction load is only considered when running at constant speed. Under normal circumstances, the static moment should be 2-3 times of the friction load, once the static moment is selected, the base and length of the motor can be determined (how many sizes).

3. Selection of current.

The operating characteristics of motors with the same static torque are very different due to different current parameters, and the current of the motor (refer to the driving power supply and driving voltage) can be judged according to the torque frequency characteristic curve diagram.

4. Torque and power conversion.

Stepper motor is generally used in a wide range of speed regulation, its power is changing, generally only measured by torque, torque and power conversion is as follows: p= m =2 ·n 60 p=2 nm 60, where p is the power unit is watts, is the angular velocity per second, the unit is radian, n is the speed per minute, m is the moment unit is Newton·m P=2 fm 400 (half-step work), where f is the number of pulses per second (pps).

In addition, stepper motors generally have the problem of out-of-step, you can choose a closed-loop stepper motor with better performance, see What is a closed-loop stepper motor.

1. Clarify the purchase model, if you can't determine the required model, it is best to recommend the model by the manufacturer, after determining the model, you should understand the basic information of the motor you purchased, including the motor power and installation method, the basic weight and speed of the motor.

2. When purchasing motors, we should pay attention to the choice of the manufacturer's reputation, try not to choose the products of small manufacturers, do not just draw the motor and do not pay attention to the quality and quality, the price difference between the same type of motor is very large, mainly due to the difference in the thickness of the copper wire, the quality of the bearing manufacturer is different and other reasons.

3. Nowadays, online sales have become a trend, and it is convenient and fast, when choosing a manufacturer online, you should pay attention to the quality of the company, check the company introduction, play ** consultation, check the business license, tax registration certificate, and sign the procurement contract.

4. If it is a manufacturer with a relatively large dosage or long-term demand, it is best to send personnel to conduct on-site inspections.

A stepper motor is an open-loop control element that converts an electrical pulse signal into angular or linear displacement. In the case of non-overload, the speed of the motor and the position of the stop only depend on the frequency and number of pulses of the pulse signal, and are not affected by the change of load, that is, a pulse signal is added to the motor, and the motor turns a step angle. The existence of this linear relationship, coupled with the fact that the stepper motor has only periodic errors and no cumulative errors.

It makes it very easy to control with stepper motors in the field of speed, position and other control fields.

Although stepper motors have been widely used, stepper motors cannot be used under conventional conditions like ordinary DC motors and AC motors. It must be composed of a double ring pulse signal, a power drive circuit, etc., and the control system can be used. Therefore, it is not easy to use stepper motors well, and it involves many specialized knowledge such as machinery, motors, electronics, and computers.