Imported DOHLE sewing machine needle 300516

Imported DOHLE sewing machine needle 300516

Imported DOHLE sewing machine needle 300516

Jiangsu Qiucheng Electromechanical Co., Ltd

Professional procurement of European industrial control products and spare parts.

Advantages of Supply Brands and Models: Wurth Hardware Tools and Chemicals, Hahn Cooper, Gaimi Valves, Schmeisser Switches, IMM Nozzles, Ergowiss Hydraulic Lift Systems, Socla Valves, Kobold Flow Meter Switches, SBS Balancing Devices, ODU Connectors, SCHURTER Filters, AMF Fixtures, Phoenix Wig Miller Terminal Connectors, Bentley Envision Module Cards, etc

Our advantages:

1) Purchase directly from the manufacturer to ensure that all products are original.

2) Reasonably priced, bypassing layers of agents, maximizing discounts to customers.

3) We have a wide range of channels, with agents in China or customers protecting manufacturers from selling products. As long as you can provide the model, we can also purchase from distributors in various countries.

4) The warehouse ships consolidated shipments every Wednesday, greatly saving logistics costs.

5) Engineers provide you with professional pre-sales and after-sales technical consulting services.

Jiangsu Qiucheng Electromechanical Co., Ltd. is a modern enterprise that integrates research and development, engineering, sales, and technical services. It is a competitive equipment supplier in the field of automation in China. The company mainly deals in industrial automation products such as mechatronics equipment, high-precision analytical and testing instruments, environmental and new energy industrial equipment, and electric tools from developed countries such as Europe, America, Japan, and South Korea.

Frequency conversion technology actually utilizes the principles of motor control to control the motor through a so-called frequency converter. The motor used for this type of control is called a variable frequency motor.

Common variable frequency motors include three-phase asynchronous motors, DC brushless motors, AC brushless motors, and switched reluctance motors.

Control principle of variable frequency motor

The usual control strategies for variable frequency motors are: constant torque control at base speed, constant power control above base speed, and weak magnetic control in the ultra-high speed range.

Base speed: Due to the generation of back electromotive force during motor operation, the magnitude of the back electromotive force is usually proportional to the rotational speed. Therefore, when the motor reaches a certain speed, the speed at this time is called the base speed because the magnitude of the back electromotive force is the same as the magnitude of the applied voltage.

Constant torque control: The motor performs constant torque control at the base speed. At this point, the back electromotive force E of the motor is directly proportional to its rotational speed. The output power of the motor is directly proportional to the product of the motor's torque and speed, so the motor power is directly proportional to the speed at this time.

Constant power control: When the motor exceeds the base speed, adjust the excitation current of the motor to

Keep the back electromotive force of the motor basically constant to increase the speed of the motor. At this point, the output power of the motor remains relatively constant, but the motor torque decreases inversely proportional to the speed.

Weak magnetic control: When the motor speed exceeds a certain value, the excitation current is already quite small and can hardly be adjusted anymore, entering the weak magnetic control stage.

The speed regulation and control of electric motors are one of the fundamental technologies for various types of machinery in industry and agriculture, as well as office and household electrical equipment. With the amazing development of power electronics technology and microelectronics technology, the use of "dedicated variable frequency induction motor+frequency converter" AC speed regulation method is leading a revolution in the field of speed regulation that replaces traditional speed regulation methods with its performance and economy. The good news it brings to various industries lies in greatly improving the degree of mechanical automation and production efficiency, saving energy, improving product qualification rate and quality, correspondingly increasing power system capacity, miniaturizing equipment, and increasing comfort. It is rapidly replacing traditional mechanical speed regulation and DC speed regulation solutions.

Due to the particularity of variable frequency power supplies and the system's requirements for high-speed or low-speed operation, dynamic response to speed, etc., strict requirements have been put forward for the electric motor as the main power source, which has brought new challenges to the motor in terms of electromagnetic, structural, and insulation aspects.

Application of Variable Frequency Motor

Variable frequency speed regulation has become the mainstream speed regulation solution and can be widely used in various industries for continuously variable transmission.

Especially with the increasingly widespread application of frequency converters in the field of industrial control, the use of variable frequency motors is also becoming more widespread. It can be said that due to the superior performance of variable frequency motors in variable frequency control compared to ordinary motors, we can easily see the presence of variable frequency motors wherever they are used.

Linear motor editing and broadcasting

The traditional "rotary motor+ball screw" feed transmission method on machine tools is limited by its own structure, making it difficult to make breakthroughs in improving feed speed, acceleration, and fast positioning accuracy. It can no longer meet the higher requirements for servo performance of machine tool feed systems in ultra high speed cutting and ultra precision machining. Linear motors directly convert electrical energy into linear motion mechanical energy without the need for any intermediate transmission mechanisms. It has the advantages of high starting thrust, high transmission stiffness, fast dynamic response, high positioning accuracy, and unrestricted stroke length. The biggest difference between using a linear motor for direct drive and the original rotary motor transmission in the machine tool feed system is the elimination of the mechanical transmission link between the motor and the worktable (drag plate), shortening the length of the machine tool feed transmission chain to zero. Therefore, this transmission method is also known as "zero transmission". It is precisely because of this "zero transmission" method that performance indicators and advantages cannot be achieved by the original rotary motor drive method.

1. High speed response

Due to the direct elimination of some mechanical transmission components with large response time constants (such as screws) in the system, the dynamic response performance of the entire closed-loop control system is greatly improved, and the response is exceptionally sensitive and fast.

2. Accuracy

The linear drive system eliminates the transmission clearance and errors caused by mechanical mechanisms such as screws, reducing tracking errors caused by transmission system lag during interpolation motion. By using linear position detection feedback control, the positioning accuracy of the machine tool can be greatly improved.

3. High dynamic stiffness due to "direct drive" avoids the need for intermediate transmission rings during starting, shifting, and reversing

The phenomenon of motion hysteresis caused by elastic deformation, friction and wear, and reverse clearance of the joint also increases its transmission stiffness.

4. Fast speed, short acceleration and deceleration process

Due to the fact that linear motors were originally mainly used for maglev trains (with a speed of up to 500km/h), it is not a problem to meet their maximum feed speed for ultra high speed cutting (required to reach 60-100M/min or higher) when used in machine tool feed drive. Due to the high-speed responsiveness of the "zero transmission" mentioned above, its acceleration and deceleration process is greatly shortened. To achieve instant high-speed start and instant accurate stop during high-speed operation. High acceleration can be obtained, generally up to 2-10g (g=9.8m/s2), while the maximum acceleration of ball screw transmission is generally only 0.1-0.5g.

5. The travel length is not limited. By connecting linear motors in series on the guide rail, the travel length can be infinitely extended.

6. Exercise quietly and with low noise. Due to the elimination of mechanical friction on transmission screws and other components, and the use of rolling guides or magnetic pad suspension guides (without mechanical contact), the noise during movement will be greatly reduced.

7. High efficiency. Due to the absence of intermediate transmission links, energy loss during mechanical friction is eliminated, greatly improving transmission efficiency.

With a professional technical and business team, the company not only brings high-quality products to customers, but also provides automation engineering technology services and complete solutions.