Tuesday, July 9, 2024

What are the commonly used motors for CNC lathes?

1.Stepper motor
Stepper motor is one of the more commonly used motors in CNC lathes. Its principle is to add electromagnetics in the column coil to make the rotor rotate a fixed angle, thereby achieving precise rotation control. This motor can accurately control the speed and feed amount of the lathe, so it is widely used in the feed system of CNC lathes. At the same time, the stepper motor can also realize the positioning control of the lathe. For example, the tool can be quickly positioned to the required position during the turning process.




2.Servo motor
Servo motor is another type of motor commonly used in CNC lathes. The motor can adjust the output angle and speed according to the control signal to achieve more precise position control. Unlike stepper motors, the speed and torque output by servo motors can be automatically adjusted as the load changes, so it is widely used in machining processes that require high precision and high efficiency, such as milling and high-speed cutting.

3.Spindle motor
Spindle motor is another key type of motor in CNC lathes. Spindle motors usually adopt a hollow shaft structure, with a higher rated speed and greater acceleration. It is responsible for driving the spindle of the lathe to achieve rotary cutting. The spindle motor usually needs to have the characteristics of high speed, high torque and high precision to meet the needs of various cutting processes. At the same time, the spindle motor also needs to have the characteristics of high reliability, low noise and stability to ensure the normal operation of the lathe.


4.Feed motor
The feed motor is another important type of motor in CNC lathes. It is mainly responsible for controlling the feed amount of the lathe, that is, the speed and direction of the workpiece movement. The feed motor usually needs to have the characteristics of high precision, high speed and high torque to meet the processing needs of various complex workpieces. At the same time, the feed motor also needs to have the characteristics of high reliability, low noise and long life to ensure the continuous and efficient operation of the lathe.

In short, in CNC lathes, motors are very important components. Common motor types include stepper motors, servo motors, spindle motors and feed motors, each of which has different characteristics and application scenarios, providing a solid power guarantee for the efficient operation of CNC lathes.

Tuesday, July 2, 2024

The basic principle of brake stepper motor

 1.What is a brake stepper motor

The brake stepper motor consists of a stator, a rotor and a brake device. The stator is covered with an electromagnetic coil, and when the coil is excited by current, a magnetic field will be generated. The rotor contains multiple pole pairs, usually made of magnetic materials. When current passes through the electromagnetic coil, the magnetic field will generate an attraction to the rotor, so that the rotor can step smoothly. The brake device is a component used to control the braking and release of the motor to ensure that the motor can remain in the desired position when it stops.



2.Advantages of brake stepper motor

1. The advantage of the brake stepper motor is its high-precision stepping control. By inputting a specific pulse signal to the motor, the rotation angle and speed of the motor can be accurately controlled. This is very important for applications that require precise positioning and fine control, such as printers, CNC machine tools, and automotive braking systems.

2.The brake stepper motor also has low power consumption and a small size, making it easy to embed and apply in most devices. In practical applications, brake stepper motors are usually used with drivers. The driver is a device used to control the movement of the motor. It is connected to the motor through an interface and can accurately position and dynamically adjust the motor according to the input signal. The driver of the brake stepper motor can provide corresponding current and pulse signals according to the set step and speed parameters, thereby accurately controlling the movement of the motor.

3.Special control methods realize more applications

For example, the speed and torque of the motor can be adjusted by changing the frequency and amplitude of the pulse signal.



Some advanced brake stepper motors can also realize closed-loop control, by installing encoders and sensors to feedback the actual position and rotation angle of the motor, thereby improving control accuracy and stability.

4.Summary

High-precision stepper control, low noise, reliability, low power consumption, small size, used in conjunction with the driver, can realize special control functions, etc.

It has a wide range of applications in various industries, such as mechanical equipment, automated production lines, instruments and meters, medical equipment, etc.

In the future, with the continuous advancement of science and technology and the continuous growth of demand, the functions and performance of brake stepper motors will continue to be improved and optimized.

We can expect more intelligent and efficient brake stepper motors to be widely used in industrial and consumer products, bringing more convenience and innovation to our lives.


Wednesday, June 26, 2024

Common problems and solutions for servo motors

 1. Controller and motor matching problems

1. Mismatch of motor types
Mismatch of motor types is a common problem that causes servo motors to fail to operate normally. When purchasing a servo motor, you need to select the appropriate motor type according to actual needs. For example, a low-speed high-torque motor is suitable for occasions that require high torque output, and a high-speed motor is suitable for occasions that require high-speed response.
2. Controller configuration problems
Another common problem with controller and motor matching is improper settings. Incorrect controller parameter settings or mismatch with the motor model can also cause the servo motor to fail to operate normally. The solution is to read the controller manual carefully and set the controller parameters correctly.

servo motor

2. Problems during interference and debugging
1. Power supply interference
Power supply interference is an important cause of servo motor problems. Excessive power supply noise can cause the servo motor controller to fail to operate normally, resulting in unstable motion and increased errors. The solution is to select a suitable power supply or use a filter according to quality requirements.
2. Mechanical problems
Mechanical problems are also one of the causes of servo motor problems. For example, failure, wear or damage of mechanical components can cause the servo motor to fail to operate normally. The solution is to maintain the mechanical components, replace and adjust them in time.
3. Debugging parameter setting problems
During the servo motor debugging process, it is easy to have improper parameter settings, such as parameter settings in proportional gain, speed limit, etc., which may affect the normal operation of the servo motor. The solution is to carefully read the controller manual according to the specific situation and check whether the parameter settings are reasonable.

AC servo motor

3. Servo motor debugging precautions
1. Electrical debugging before mechanical debugging
Before debugging the mechanical parts, perform electrical debugging first to ensure the normal operation of the electrical part.
2. Debugging must be carried out strictly in accordance with the requirements
During the servo motor debugging process, it must be debugged strictly in accordance with the requirements, including debugging of speed, acceleration, position control, etc.
3. Pay attention to the output method
During the servo motor debugging process, you need to pay attention to the output method. Generally speaking, there are several ways for motor output, such as position control output, speed control output, and torque control output.

Source:https://steppermotor2.hatenablog.com/entry/2024/06/26/163901

Tuesday, June 18, 2024

Characteristics and Applications of Bipolar Stepper Motors

1.What is a bipolar stepper motor?

A bipolar stepper motor is a common type of motor that has positioning and control functions. Its operating principle is to control the current outside the motor so that the motor can stay in a precise position at each step. Through this process, the bipolar stepper motor can control its speed and positioning in a very precise way, making it very suitable for some demanding applications.

2.Characteristics of bipolar stepper motors

1.High-precision positioning: Bipolar stepper motors use stepping technology, and each step position is very accurate, which can accurately locate the required position.




2.Strong reversibility: The direction of operation of the bipolar stepper motor can be achieved by changing the direction of the external current, so the opposite direction of operation can be achieved without changing the motor structure.

3.Large static torque: Even in a stationary state, the bipolar stepper motor can provide a high torque output, which allows it to withstand various loads and provide good starting power when it starts to rotate.

4.Simple design: Compared with other types of motors, bipolar stepper motors are also very easy to design and manufacture due to the simplicity of their working principle and easy control.

3.Application of bipolar stepper motors

1.CNC machine tools: The high-precision positioning capability of bipolar stepper motors, as well as the characteristics of reversibility and high torque output, make them an indispensable part of CNC machine tools.

2.Electric bicycles: Bipolar stepper motors are also widely used in electric bicycles. Their high torque output and flexible control capabilities can effectively improve the stability and safety of electric bicycles.

3.Smart home: In smart homes, bipolar stepper motors are also widely used in the control of some household appliances, such as electric curtains and smart toilet lids.

In short, bipolar stepper motors have the characteristics of high-precision positioning, strong reversibility, large static torque, and simple design. They are widely used in many fields.


Thursday, June 13, 2024

The closed loop stepper motor VS servo motor

There are significant differences between closed-loop stepper motors and servo motors in terms of control methods, accuracy, speed response performance, overload capability, operating performance and price.

1.control method:

Closed-loop stepper motors usually use an open-loop control system to control the rotation angle by controlling the number of pulses. Each pulse corresponds to a fixed step angle. This control method makes the movement of the stepper motor discrete and can accurately control the position of each step.

Servo motor


The servo motor uses a closed-loop control system to control the rotation of the motor through real-time position feedback. The encoder monitors the actual position of the motor rotor and feeds this information back to the controller. The controller compares the input position command and adjusts the motor based on the difference to achieve precise motion control.

2.Accuracy:

The accuracy of a closed-loop stepper motor depends on the number of phases and the subdivision setting of the driver, while the accuracy of a servo motor depends on the resolution of the encoder, and generally the accuracy of a servo motor is higher than that of a stepper motor.

3.Speed ​​response performance:

It takes 200 to 400 milliseconds to start a closed-loop stepper motor, while it only takes a few milliseconds for a servo motor to start, showing the servo motor's advantage in speed response performance.

Closed-loop stepper motor


4.Overload capacity:

Closed-loop stepper motors generally do not have overload capability and are prone to losing steps when the starting frequency is too high or the load is too large. In comparison, servo motors have stronger overload capabilities.

5.Running performance:

The closed-loop stepper motor is open-loop controlled and will not lose steps or overshoot, but it is prone to low-frequency vibration at low speeds. The AC servo motor runs smoothly and does not vibrate even at low speeds. Servo systems will outperform stepper motors in many performance aspects, but will also be more complex to control.

6.price:

Servo motors are more expensive than closed-loop stepper motors, but this price difference is not entirely a shortcoming of servo motors, but reflects their technical complexity and high performance.

To sum up, closed-loop stepper motors and servo motors each have their own advantages and applicable scenarios. Closed-loop stepper motors are suitable for applications that require precise control of the position of each step, while servo motors are suitable for applications that require high-precision positioning and high-speed response performance. Which motor type you choose depends on specific application needs and budget considerations.


Tuesday, May 28, 2024

The applications and working principle of PM stepper motor

1.Definition

A permanent magnet stepper motor (PM stepper motor) is a type of stepper motor that uses a permanent magnet as the rotor instead of a traditional wound rotor. This allows for a simpler and more compact design, with high torque and precise motion control.

2.Worrking principle

The basic working principle of a PMSM involves the interaction between the magnetic fields of the stator and rotor. When a current is passed through the windings of the stator, it creates a magnetic field. This magnetic field interacts with the permanent magnetic field of the rotor, causing the rotor to turn, or “step”.

Single Phase Excitation: In this mode, only one phase winding is energized at a time. It results in the least amount of torque and power, but it conserves energy.

Two Phase Excitation: In this mode, two phase windings are energized simultaneously. It offers a higher level of torque and power compared to single-phase excitation.

PM stepper motor

3.Applications

(1)CNC Machines

CNC machines are highly advanced machines used for cutting, drilling, and shaping various types of materials. Permanent magnet stepper motor plays a crucial role in the operations of CNC machines.

Permanent magnet stepper motors move in small steps with high step resolution which results in precise positioning and allows to cutting of the materials in specific designs and shapes. These machines drill holes in materials with precision and repeatability. PM stepper motors offer high torque at low speeds, which helps the motor maintain its position and drill the material in repeated movement.

(2)3D Printers

A 3D printer is a highly advanced printer that has the ability to turn a digital design into physical objects by depositing layers of materials on each other.

The 3-phase stepper motor allows precise control over the movement of the 3D printer for depositing the materials layer by layer and is responsible for creating the intricate design with high accuracy. These motors can be programmed at different speeds and directions and allow printers to create intricate designs and patterns with multiple layers and different colors. 

(3)Medical Equipment

Permanent magnet stepper motors play an important role in various medical equipment such as MRI machines, robotic surgery machines, 

In MRI machines, these motors offer precision and accuracy, which help to position the patient correctly and obtain clear and accurate images of different parts of the body.

(4)Textiles Machines

Permanent magnet stepper motor plays an important in the functioning of textile machines. From spinning to weaving, dyeing, and finishing, these 3-phase stepper motors are used in every stage of manufacturing.

These motors use different stepping modes to move small steps in a controlled manner. This is crucial for textile machines, where even a small error will result in defective products. This ensures that each movement is accurate and results in high-quality products.

4.Advantages

It is compact and small in size, which makes it useful in many applications

Due to the absence of any external excitation, the losses are less and maintenance is less.

It can be connected to the external circuit, to control the speed of the motor

Sensors may be used to locate the rotor winding

Can be operated in a wide range of speed and torque.

Precise Control

What are the commonly used motors for CNC lathes?

1.Stepper motor Stepper motor is one of the more commonly used motors in CNC lathes. Its principle is to add electromagnetics in the column ...