Induction power supply for motor manufacturing

In the motor manufacturing industry, especially in the field of large-scale motor manufacturing, induction power supplies play a very important role, such as the connection of motor windings, the thermal assembly of parallel heads and flanges and paint heat curing. Induction power supply has many advantages such as stable welding quality, fast heating speed, good controllability, easy to realize intelligent manufacturing, high thermal efficiency and remarkable energy-saving effect.

Breakthrough the traditional heat conduction and coal, biofuel and other combustion heating methods, using the world's most advanced Texas Instruments high-speed digital signal processor (HDSP), using a new generation of IGBT or MOSFET as the main inverter device, air-cooled, water-cooled or a combination of ways to make the equipment more suitable for the application of the motor industry, full digital control, electrodeless control, the workpiece itself to generate heat, no fuel, non-fuel Low loss, high power factor, high heating speed, high thermal efficiency, significant energy saving effect, easy to realize intelligent manufacturing with specially developed workpieces and many other advantages.

The use of induction power can be applied in many industrial fields in addition to manufacturing applications in the motor industry. It can be used for welding with high efficiency and no damage to the base material to be welded. It is suitable for local welding of high precision and large volume workpieces, large volume base materials and various types of metal pipes; the surface of various components. Heat treatment is also a large number of induction heating methods; steel-plastic material manufacturing, aluminum-plastic film processing and food industry, pharmaceutical industry sealing process also uses a large number of induction heating.

Most induction motors are powered by constant voltage and constant frequency, which has the advantages of simple control equipment, safety and durability, and easy to use. When the load torque is lower than the rated torque, the speed of the motor rises, but the motor's operating efficiency decreases.

The existing AC-DC converter is mainly used to supply power and control the conduction angle of thyristor at high frequency to achieve a certain degree of energy saving, but there are the following shortcomings: (1) special drive control system is needed, which is expensive and complicated; (2) frequent on-off of power components of the drive circuit generates high harmonic current, which makes the motor system hot and easy to age, and pollutes the power grid at the same time.

The project accordingly proposes an automatic control energy-saving system and method for an induction motor, the automatic control energy-saving system including an autotransformer regulator, an induction motor, a servo motor, a controller, and a current and active power measurement unit of the induction motor, wherein the output of the controller controls the servo motor, and the mechanical output port of the servo motor realizes voltage regulation of the autotransformer regulator, the autotransformer The current and active power measurement unit is used to measure the current and active power of the induction motor and transmit the measured signals to the controller, which generates control signals based on the current and active power measurement signals to drive the servomotor to adjust the output voltage of the autotransformer regulator to achieve high efficiency operation of the motor. In the case of power supply at working frequency and low investment in equipment, the motor's power supply voltage can be adjusted automatically according to the load condition to realize energy-saving operation when the motor is under light load.

Priority industrial fields: 1) production fields where electric motors are often operated with light load; 2) aviation and marine fields where limited energy is used for power supply.

Through the development of electrolysis equipment and supporting technology, the project aims to produce a profile line matching the rubber bushing in the inner hole of the metal stator shell, making the rubber bushing an equal wall thickness structure, achieving the technical objectives of small wall thickness, wear resistance, high efficiency and long service life, and improving the overall level of domestic screw drilling tools. The project has been successfully drawn out of the oil screw drilling tool shell shaped inner hole profile line samples (Figure 2), in the processing experiments have achieved the expected results. The technical steps are clear and the processing process is stable. After completing the user's sample processing verification, the project has entered into small-scale production.

Compared to metal cutting and conventional machining methods such as numerical control milling, mechanical drawing, precision casting and internal forming by external rolling, the use of the electrolytic machining method for machining the spiral surface of the stator of a screw drilling tool with the same wall thickness has been tested. It has the advantages of low cost, high efficiency and one-time molding.

This product development can break the foreign monopoly, and the cost of domestically produced properties is very competitive. On the one hand, it is attractive for mining companies, and on the other hand, foreign drilling products companies are looking for manufacturers suitable for production in the country. At present the technical level of this product has reached the technical indicators of this type of product and has a competitive advantage for a long time.

It is configured as two sets of equipment with a total investment of 10 million yuan. The production capacity is 300 pieces of annual output for each equipment, and 600 pieces for both sets. The output value of each piece is 25,000 yuan, the annual output value is estimated to be 15 million yuan, and the profit is 6 million yuan. The investment payback period is 1.67 years.

The services provided by the Quality Management Engineering Team of the School of Business of Shanghai Institute of Electrical Engineering include enterprise management system planning and optimization, R&D and innovation management, procurement and supply chain management, production and operation management, whole process quality management, reliability improvement, lean production and Six Sigma management training and coaching. At the same time, we help customers to carry out the declaration, training and coaching work of China Quality Award and National Quality Award.

Prioritize industrial fields and local areas: 1) life-cycle quality and reliability management in the electrical and electronic field; 2) life-cycle management and reliability management in the field of automobiles and communication semiconductors; 3) quality management methods and reliability management in the high-end equipment manufacturing industry.

        Two-speed induction linear motor

The two-speed induction linear motor is based on the induction linear motor itself and adopts a novel integrated structure design, which has the following advantages compared with the traditional design of driving moving parts with different speed requirements by using two induction linear motors: ① the volume and weight of the device is reduced and the structure is simplified; ② the production cost of the device is low; ③ the moving parts with different speed requirements are separated from each other. Coordinated control is enhanced and control accuracy is improved; ④ Power can be managed and utilized in a unified manner to improve efficiency.

Priority industrial fields: 1) complex processing, servo drive, robotics, aviation and marine equipment and other manufacturing industries; 2) logistics and other service industries.

Small low-temperature furnace is a small temperature control equipment using semiconductor refrigeration stack design and production, the overall size of 400 × 300 × 120 (mm), power consumption is less than 500W, fast and controllable cooling rate, low noise, can be placed on the optical platform, suitable for matching high-precision instruments and equipment, can be used for temperature fiber optic sensor development process of low-temperature environment simulation.

It can be used as a supporting instrument for fiber optic sensing research. Fiber optic temperature sensors, pressure sensors, gyroscopes, liquid level sensors, etc., in the development of the need to test its environmental adaptability, to determine the impact of ambient temperature on the physical quantity to be measured by the sensor, and make corresponding corrections. High temperature environment in the laboratory is easy to simulate, there are ready-made high temperature furnace, but for the simulation of lower than the ambient temperature, there is no suitable instrument, with compressor refrigeration, large volume, vibration, noise, not suitable for placement in the optical platform and ultra-clean room to use, the invention uses semiconductor cooling plate, small size, basically no noise and vibration, and cooling rate, easy to control.

The small cryogenic furnace is mainly used for the simulation of low temperature environment during the testing of temperature fiber optic sensors, but also as a test environment simulation of other temperature sensors, mainly in the central and southern regions.

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