What are the types of servo motors in servo presses?

Servo presses can be classified according to different structures and uses. Here are a few common ways to classify them: 1

Structure classification: C-shaped servo press: It adopts C-shaped structure, which has high rigidity and stability, and is suitable for pressing, stamping, bending and other processing operations on workpieces.

The servo system can precisely control the amount of pressure and the time it is applied, so as to achieve precise machining of the workpiece. C-shaped servo presses are widely used in automotive, electronics, home appliances, metal processing and other industries. H-shaped servo press:

The frame has an H-shaped structure. This model has the characteristics of high precision, high efficiency and high stability, and is suitable for cold stamping, cold extrusion, punching, bending and other processing processes of various metal materials. The servo system can precisely control the pressure, speed and position, making the machining process more precise and reliable.

H-shaped servo presses are widely used in the production of automobiles, home appliances, electronics, hardware and other industries. Four-column servo press: It is supported by four columns, the upper part is provided with a pressure head, and the lower part is equipped with a worktable, and the movement of the pressure head is controlled by the servo system to realize the pressure processing of the workpiece.

Punch servo press: It adopts a punch structure, and controls the pressure and movement of the cylinder through the servo system to realize the stamping of the workpiece. 2.

Application classification: Stamping machine: mainly used for stamping processing, the production of auto parts, home appliances, communication equipment, digital products and other parts.

Molding machine: mainly used for the production of rubber, plastic, silicone molding processing. Hot Press Machine:

It is mainly used for the production and processing of granite, marble and other stones, polyurethane and composite materials. Welding machine: mainly used for welding and assembly of metal products.

Tensile machine: It is mainly used for tensile experiments to test the strength and toughness of materials, etc. Complete Equipment:

It mainly refers to the press equipment used with other processing and production equipment.

The servo motors in servo presses are commonly used in Xintaiming DC servo motors and AC servo motors, and recently there have been switching reluctance servo motors.

There are many forms of motors, but their working principles are all based on the laws of electromagnetic induction and electromagnetic forces. Therefore, the general principle of its construction is to use appropriate magnetic and conductive materials to form magnetic circuits and circuits that carry out electromagnetic induction with each other, so as to generate electromagnetic power and achieve the purpose of energy conversion.

According to the different starting and operation modes of the motor, it can be divided into capacitive starting single-phase asynchronous motor, capacitive running single-phase asynchronous motor, capacitor starting single-phase asynchronous motor and split-phase single-phase asynchronous motor, three-phase motor.

According to the structure of the motor, it can be divided into cage induction motor, which is the one you are using (the old standard is called squirrel cage asynchronous motor) and the wound rotor induction motor (the old standard is called the wound asynchronous motor). A squirrel cage is a closed coil.

1) When the three-phase asynchronous motor is connected to the three-phase AC power supply (each with a difference of 120 degrees of electric angle), the three-phase stator winding flows through the three-phase symmetrical current to generate the three-phase magnetodynamic potential (stator rotation magnetodynamic potential) and generate a rotating magnetic field, which rotates clockwise along the inner circular space of the stator and rotor at a synchronous speed.

2) The rotating magnetic field has a relative cutting motion with the rotor conductor, and according to the principle of electromagnetic induction, the rotor conductor (the rotor winding is a closed path) generates an induced electromotive force and an induced current (the direction of the induced electromotive force is determined by the right-hand rule).

3) According to the law of electromagnetic force, under the action of induced electromotive force, an induced current will be generated in the rotor conductor that is basically consistent with the direction of the induced electromotive force. The current-carrying rotor conductor is subjected to electromagnetic force in the magnetic field generated by the stator (the direction of the force is determined by the left-hand rule), and the electromagnetic force forms an electromagnetic torque on the motor rotor shaft, which drives the motor rotor to rotate along the direction of the rotating magnetic field, and when the motor shaft is mechanically loaded, it outputs mechanical energy outward. Since the magnetic flux of the part without a short-circuit ring is superior to that of the part with a short-circuit ring, the direction of rotation of the motor is the same as that of the rotating magnetic field.

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The motor is directly connected with the actuator to push the slider to work, and has the shortest transmission chain, so the structure is simple, the transmission efficiency is high, the precision is high, and it is very promising for development. There are currently two forms of this press.

1) The linear servo motor directly drives the press, and the linear motor can directly convert the electrical energy into linear motion, push the slider to work, and achieve "zero transmission". It has been successfully applied to the feed of machine tools, maglev trains, etc. In the 90s of the last century, Zhejiang University has developed such presses of 5-50kN, which save 40% energy, reduce volume by 60% and reduce weight by 40% compared with ordinary mechanical presses.

AIDA has launched a series of products of L-SF-300S, with a maximum specification of 10kN, stroke of 100mm, and a maximum working frequency of 200spm. The same type of press developed by Yamada DOBBY has a teach-in function, a maximum pressure of 24kN, and a slide accuracy.

2) Servo motor direct drive crank, NC1-D and NS1-D series of AIDA company in Japan belong to this type of products. The low-speed and high-torque servo motor is directly connected to the crank, without a deceleration mechanism, which is not only simple in structure, reduces maintenance, saves energy, but also has low noise, claiming that even in residential areas, it can work 24 hours a day. Due to the limitation of the torque of the servo motor, the tonnage of the press cannot be too large, and the maximum tonnage is currently 2500kN.

It is divided into two categories: DC and AC servo motors, and servo motors refer to the engines that control the operation of mechanical components in the servo system, and are a kind of auxiliary motor indirect transmission devices. The servo motor can control the speed, and the position accuracy is very precise. It converts the voltage signal into torque and speed to drive the plant.

The rotor speed of the servo motor is controlled by the input signal, and the response speed is fast. In the automatic control system, it is used as an actuator, which has the characteristics of small electromechanical time constant and high linearity, and can convert the received electrical signal into angular displacement or angular velocity output on the motor shaft. It can be divided into two categories:

DC servo refers to the rotten pulse service motor and AC servo motor. Its main feature is that when the signal voltage is zero, there is no rotation phenomenon, and the speed decreases uniformly with the increase of torque.

Servo electronic press (electronic servo press) has the following characteristics:

1.High precision: The electronic servo system control can achieve accurate pressure cracking control to ensure the quality and consistency of the product.

2.High search efficiency: The electronic servo system has the characteristics of fast response, which can quickly adjust the pressure and speed, and improve the high production efficiency of the travel state.

3.Programmability: The electronic servo press can be programmed and controlled to achieve a variety of pressure and speed settings to adapt to different process requirements.

4.High degree of automation: The electronic servo press can be linked with other automation equipment to realize the construction of automated production lines.

5.Easy to operate: Touch screen or numerical control system is used for operation, the interface is friendly, the operation is simple, and the technical requirements of the operator are reduced.

6.Low energy consumption: Servo motor drive, with high energy utilization, can save energy and reduce production costs.

7.High safety: The electronic servo press has a variety of safety protection measures, such as overload protection, emergency shutdown, etc., to ensure the safety of operators.

8.Low maintenance cost: Electronic servo presses have fewer mechanical transmission parts, which reduces the cost and workload of maintenance and repair.

1.Accurately control the maximum pressing output of the equipment, and display the current equipment output in real time;

2.Real-time display of the current press-fitting fiber grinding position in the unit;

3.Real-time depiction of force and displacement of press-fitting curves;

4.Interference detection can be performed during the part press-in process;

5.The final press-fit position can be compared to detect whether the press-fit is in place;

6.The rigidity of the product can be tested;

7.It can store the press-fitting vertical belt parameter cleaning bucket of multiple sets of equipment to facilitate the next use and recall it;

8.Press-fit data can be stored.

The whole process of pressing force and displacement curve chart is displayed on the LCD search stupid display touch screen, and the whole process control can automatically determine whether the product is qualified at any stage of the operation, and remove all defective products and socks in real time, so as to achieve the best management.

There are three main types of servo motors: DC servo motors, AC servo motors, and stepper servo motors. Their respective characteristics and applications are as follows:

DC servo eliminator motor.

DC servo motors have fast response speed and high torque density, which is especially suitable for low-speed medium and medium load and high data precision control applications. However, due to its short service life and relatively complex maintenance, it is now used less.

AC servo motor.

AC servo motor is a kind of servo motor that uses the current power supply to supply power, which has the characteristics of low energy consumption and long service life, and is more prominent in the application of high load or high torque plus point. The market is basically dominated by brushless motors.

Stepper servo motor.

Stepper servo motor is a new form of motor that combines stepper motor with servo control technology. It is more responsive than the traditional stepper motor, with low out-of-step rate, uniform torque, not easy to lose step and multi-turn output, and is widely used in printing, packaging, paper cutting and linear release systems and other work fields that require high-precision positioning, stability and controllability.

The above three servo motors need to be selected according to the actual application requirements when designing, and take into account the power supply, communication, encoder and sensor. At the same time, attention should be paid to maintaining the accuracy and stability of its state quantity during use, so as to extend the service life and improve efficiency as much as possible.

1.The equipment adopts a single-column structure servo motor to drive the ball screw movement, and the touch electronic screen displays.

2.Real-time press-fitting curve display and storage function, to achieve 0% of NG products.

3.High-precision displacement and force, displacement accuracy can reach, force accuracy error.

4.100 sets of press-fitting programs can be set to achieve multi-purpose of one machine.

5.The energy-saving effect is more than 80%, and it is more environmentally friendly and safe, which can meet the requirements of equipment use in the dust-free workshop.

6.Stroke six speeds: fast forward, detection, press-fitting, buffering, pressure holding, return.

7.Seven joining modes can be selected during program setting.