Friday, June 28, 2024

Unipolar Stepper Motor vs Bipolar Stepper Motor

1.Unipolar stepper motor


Unipolar stepper motors usually consist of two coils, each of which can control the direction of current to cause the motor to rotate. Unipolar stepper motors use a single drive signal to control the operation of two phases of the motor, so that the motor rotates at a certain step angle. The working principle is relatively simple. The phase is controlled by a single signal, so that the two coils are activated one after another to achieve rotation.

2.Advantages and Disadvantages

The advantages of unipolar stepper motors are that the control is simple and easy to implement, the cost is low, and the application fields with low precision are becoming more and more common. The disadvantage is that the torque is difficult to control and problems such as vibration and noise are prone to occur.

3.Applicable scenarios

Unipolar stepper motors are suitable for applications where torque requirements are not high, speed requirements are not high, and noise requirements are low. Such as consumer electronics, toys, clocks, etc.

2.Bipolar stepper motor


Bipolar stepper motors usually consist of four coils, each of which can make the motor rotate by adjusting the magnitude and direction of the current. The difference between a bipolar stepper motor and a unipolar stepper motor is that it requires two phases of drive signals to control. The two phases control the four coils of the motor respectively, allowing the motor to rotate at a finer step angle.

2.Advantages and Disadvantages

The advantage of the bipolar stepper motor is that it can control the step angle more accurately, the speed is relatively stable, and it has high torque. The disadvantage is that the control is more complicated and requires more complex drive circuits and control systems. Compared with unipolar stepper motors, the cost is higher.

3.Applicable scenarios

Bipolar stepper motors are suitable for scenarios that require high accuracy and speed, such as digital cameras, printers, scanners, etc.

In summary, different types of stepper motors can be selected depending on the application requirements. In practical applications, factors such as the motor's power, speed range, and load characteristics also need to be considered. Careful consideration is required when selecting a stepper motor. 


Monday, June 24, 2024

Structure and maintenance of Worm Gearbox

 1. Introduction

Worm Gearbox is a power transmission mechanism that uses a gear speed converter to reduce the number of revolutions of the motor to the desired number of revolutions and obtain a larger torque. In the mechanism used to transmit power and motion, the application range of reducers is quite wide. Its traces can be seen in the transmission systems of various machines, from ships, cars, locomotives for transportation, heavy machinery for construction, processing machinery and automated production equipment used in the machinery industry, to common household appliances and clocks in daily life. Its application ranges from large power transmission work to small loads and precise angle transmission. In industrial applications, reducers have the functions of reducing speed and increasing torque. Therefore, they are widely used in speed and torque conversion equipment.


2. Basic structure
The basic structure is mainly composed of transmission parts worm gear, shaft, bearing, box and its accessories. It can be divided into three basic structural parts: box, worm gear, bearing and shaft combination. The housing is the base of all accessories in the worm gear reducer. It is an important accessory that supports and fixes the shaft system components, ensures the correct relative position of the transmission accessories, and supports the load acting on the reducer. The main function of the worm gear is to transmit the movement and power between the two staggered shafts, and the main function of the bearing and shaft is to transmit power, operate and improve efficiency

3. Features
1. Compact mechanical structure, light volume and appearance, small and efficient;
2. Good heat exchange performance and fast heat dissipation;
3. Easy installation, flexible and light, superior performance, easy maintenance and repair;
4. Smooth operation, low noise, and durable;
5. Strong usability, high safety and reliability

4. Use and maintenance
1. Please do not apply pressure to the output components and housing of the reducer during installation. Please meet the corresponding requirements of coaxiality and verticality between the machine and the reducer when connecting.
2. The lubricating oil should be replaced after the reducer runs for 400 hours, and the subsequent oil change cycle is about 4000 hours.
3. Sufficient lubricating oil should be retained in the reducer housing and checked regularly.
4. Keep the reducer clean and remove dust and dirt in time to facilitate heat dissipation.


Sunday, June 16, 2024

What's suitable inertia ratio of the servo motor?

Inertia ratio is a crucial parameter when selecting a servo motor. It determines the motor's response speed and control accuracy. However, finding the right inertia ratio is not a simple task. We will take you to explore the appropriate range of servo motor inertia ratio and provide you with some guidelines for selection.

1.What is inertia ratio?

The inertia ratio is the ratio of the motor's rotational inertia to the load's rotational inertia. Generally, the smaller the inertia ratio, the faster the motor's response speed, but the accuracy may be reduced; the larger the inertia ratio, the higher the motor's control accuracy, but the response speed may be slower.

2.Consider load characteristics:

When selecting the inertia ratio of a servo motor, the characteristics of the load must be considered. For high-inertia loads, such as large robotic arms or mechanical transmission systems, choosing a smaller motor inertia ratio can improve the system's response speed, but still maintain sufficient control accuracy.

3.Consider acceleration and speed requirements:

Consider the acceleration and speed requirements of the system. High acceleration and speed requirements usually require a smaller inertia ratio to ensure that the motor can respond quickly to changes in the system.

4.Controller performance:

The performance of the controller is also a key factor affecting the selection of servo motors. High-performance controllers can better handle larger inertia ratios, providing higher control accuracy and stability.

5.Comprehensive considerations:

The optimal inertia ratio usually requires a balance between the motor and the load. Consider the load characteristics, acceleration, speed requirements, and controller performance, and select an inertia ratio that balances the system between speed, accuracy, and stability.


When selecting the inertia ratio of a servo motor, in-depth analysis and comprehensive considerations must be performed. Considering the load characteristics, acceleration, and speed requirements, selecting an appropriate inertia ratio can ensure that the system can operate stably and efficiently under various working conditions.

Wednesday, June 12, 2024

Technical parameters and applications of Nema17 stepper motor

NEMA17 stepper motors are widely used in various applications that require precise motion control. This motor is favored for its small size, high performance, long durability, low noise and high efficiency. The base size of NEMA17 stepper motors is 42mm, and a variety of body thickness, lead screw and screw stroke are available for customers to choose freely to meet different application requirements.

1.In terms of technical parameters, NEMA17 stepper motors usually have bipolar holding torque. For example, the M1173020 NEMA17 stepper motor provided by LAM Technologies has a bipolar holding torque of 0.28 Nm (39 oz-in), a moment of inertia of 34 g cm² (0.186 oz-in²), a length of 34 mm (1.34 inches), a weight of 240 g (8.47 oz), and a flange size of NEMA 17 inches 42.3x42.3mm (1.67 x 1.67 inches).

2.In terms of application areas, NEMA17 stepper motors are widely used in medical equipment, semiconductor processing, valve control, X-Y worktables, handheld instruments, or anywhere precise linear motion is required. These motors provide small linear motion solutions for a variety of motion control applications.

3.In terms of manufacturers, Italy's LAM Technologies is a manufacturer that has been in the market for more than 20 years and has a dominant position in the field of motion control. The NEMA17 series of products they provide include stepper motors, stepper drivers, power supplies, and kits to meet the needs of different customers.

4.In terms of other features, the HT17-278 series NEMA17-sized high-torque 2-phase hybrid stepper motors provided by AMP in the United States have high-torque design, standard NEMA 17 size, dual-axis version, UL certification of the motor, encoder options, etc.

In summary, NEMA17 stepper motors have become the first choice for many precision motion control systems due to their superior performance and wide range of applications.

Thursday, June 6, 2024

What is a pancake stepper motor?

 1. Overview of Pancake Stepper Motor

A pancake stepper motor is a special motor that uses electric pulses to control the motor steps. Its structure is similar to that of a DC motor. The pancake stepper motor consists of a stator, a rotor, an end cover, a rotor shaft, front and rear plates, and a stator coil.

2. Functions of Pancake Stepper Motor

1. High precision: Pancake stepper motors can achieve precise steps according to the control signal. They have the characteristics of high precision, fast response, and strong stability. They are widely used in mechanical equipment with high precision requirements.

2. High horsepower: Pancake stepper motors will generate a large torque when running, which can provide sufficient driving force for mechanical equipment. They are suitable for heavy loads, low speeds, and high starting torque requirements.

3. Simple control: The control signal of the pancake stepper motor only needs to output electric pulses, which is simple and convenient to control. In addition, it can also achieve small step control, providing more accurate motion control for mechanical equipment.

4. High reliability: Pancake stepper motors are not easy to damage, have a long life, and are highly reliable.

3. Application of Pancake Stepper Motor

Pancake stepper motor has the characteristics of high precision, high horsepower, simple control and high reliability. It is widely used in robots, automation equipment, medical equipment and other fields to provide power for the movement of mechanical equipment and realize the efficient operation of mechanical equipment.

4. Conclusion

In short, pancake stepper motor is a motor with high control precision, high horsepower, simple control and high reliability. It has a wide range of application prospects and plays a very important role in mechanical equipment. It can improve the operation accuracy and efficiency of the equipment and provide strong power for the operation of mechanical equipment.


Introduction to the functions and troubleshooting of closed-loop stepper motor drivers

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