It is the mechanical characteristics of switched reluctance motor, so its mechanical characteristics are good because the starting torque is 2-3 times larger than the rated torque. Power converter is the energy provider for the operation of switched reluctance motor, and it is the switching element connecting the power supply and the motor winding. Through it, the power supply energy can be fed into the motor, and the magnetic field energy stored in the motor can also be fed back to the power supply. The switching element used in the power conversion circuit is a fast insulated gate bipolar transistor (IGBT). Theory and practice have proved that SRD system can be compared with the current variable frequency speed regulation system in terms of unit volume torque, efficiency, volt-ampere capacity of inverter and its performance parameters. This model has great advantages in the ratio of torque to moment of inertia, especially at two critical speeds, which makes the variable range wide and many controllable factors. It is an ideal new speed regulation system. At this time, it should be pointed out that the SRD system is different. By changing the working mode and control parameters of the motor, it is easy to achieve different performance characteristics and meet special performance indicators. Especially when single-chip microcomputer or DSP monolithic programmable microprocessor chip is used as the control core, many different performance requirements of users can be met by modifying the software. With the continuous progress of scientific and technological capabilities and the improvement of semiconductor integrated control technology, SRD systems have been serialized, and a variety of medium and small power SRD systems have been applied to different industrial departments and household appliances. 2.SRD system is characterized by: * low starting current (≤30% rated current) and high starting torque, which is 2-3 times larger than rated torque; * Wide speed range; The speed regulation ratio is greater than 20: 1, and the speed regulation is smooth and endless; * Good load characteristics; High stability accuracy, constant speed when the load changes, and the stability accuracy is ≤ 0.5%; * High system efficiency, from low speed, medium speed to high speed, with system efficiency above 85%; * The mechanical structure is firm and can run without maintenance; * It has the characteristics of small current and large torque when starting, and the current impact of its motor and controller is small when starting, and the heating is smaller than that during continuous rated operation; * In braking operation and electric operation, it also has excellent torque output ability and working characteristics. Therefore, it is suitable for frequent startup or frequent forward and reverse operation, and the conversion frequency can reach 1000 times/h. Due to the above characteristics, it can be developed and applied in a wide range of fields. 3. Application of Switched Reluctance Motor Speed Control System (SRD) Switched Reluctance Motor Speed Control System (SRD) has a wide range of applications. With the continuous progress of scientific and technological capabilities and the improvement of semiconductor integrated control technology, SRD systems have been serialized, and its multi-power SRD systems have been applied to different industrial sectors, household appliances and national defense and military industries. Equipment that needs frequent start-up, stop, fast, frequent positive and negative rotation and large-scale speed regulation. Such as gantry planer and milling machine in mechanical industry, electrode lifting of reversible rolling mill, flying saw, flying shear and electric arc furnace in metallurgical industry, scientific research and experimental equipment, medical instruments, food, printing machinery, automobiles, electric locomotives and aerospace technology, household appliances, etc. 3. 1 Application in the planer; The planer is a common machine tool for processing large metal planes. The cutting process is as follows: the beam and the side tool rest move on the column, the vertical tool rest moves left and right on the beam, and the workbench where the workpiece is located does linear reciprocating motion on the guide rail. The driving motor of single table requires: * it can start, brake and rotate forward and backward frequently and quickly, and it can automatically and smoothly change speed in linear reciprocating motion. * The speed can be smoothly adjusted within the speed ratio range of ≥20. * Before cutting the workpiece, the speed shall not be lower than 95%. * When reversing at any speed, the impact current is limited within the allowable value. * When the workbench is commutated back and forth, the distance between the cutting point and the cutter is not more than 7-Bom, and good braking can be achieved. In the past, DC cars and DC speed control systems were the most commonly used. Although the performance meets the requirements, it also has some shortcomings such as complex structure, large volume, troublesome operation, large maintenance, low efficiency and high energy consumption. In recent years, after using SRD, the reducer is omitted, the structure is simplified, the operation is convenient, the energy consumption is reduced, and the cost is reduced. 3.2 The "edge detection" equipment used in the textile industry has achieved good results through the practical use of "edge detection" and "centering" equipment in the textile industry. As an "edge detection" device, the reaction speed of power is less than 0.3s, that is, when the motor is running, it can realize reverse rotation within 0.3s after receiving the instruction, which requires continuous and frequent operation within 24 hours, and at the same time requires large-scale stepless speed regulation. These functions are difficult to realize in variable frequency speed regulation system. 3.3 Used in household appliances: It will overcome the defects of today's washing machines, air conditioners and refrigerators and become a more perfect new generation product. 3.3. 1 At present, there are two kinds of modern washing machines widely used in the world: one is fully automatic pulsator washing machine, and the other is fully automatic drum washing machine. The performance requirements of these two types of washing machines are the same: that is, the motor should rotate at a low speed when washing, which can adapt to frequent positive and negative rotation; During dehydration, the motor should rotate at high speed. Therefore, 2-pole/16 pole pole-changing two-speed single-phase asynchronous motors are adopted, which barely meet the requirements of use, but the speed regulation performance is poor, the efficiency is low (generally below 30%), and the starting current is large (especially when washing frequently in the positive and negative directions, it reaches more than 7-8 times the rated current). Replacing the original 2-pole/16-pole pole pole-changing two-speed single-phase asynchronous motor with SRD system can overcome the above defects. Because of the wide speed range of SRD system, "washing" and "dehydration" can work at the best speed; The good starting performance of SRD system can eliminate the impact of starting current on the power grid during washing, and make washing and commutation stable and noiseless; Achieve high efficiency in the whole speed regulation range and greatly reduce power consumption. 3.3.2 The core components of air conditioners and refrigerators are compressors, which are mostly driven by single-phase asynchronous motors for two-position on-off temperature control, so the system efficiency and power factor are low and the temperature fluctuates widely. Moreover, the current is large when starting, which has a serious impact on the power grid. In recent years, there is a new product "frequency conversion air conditioner", which replaces single-phase asynchronous motor air conditioner with asynchronous electric frequency conversion speed regulation system, and has achieved a series of advantages, such as fast cooling speed, low operating noise, high efficiency and energy saving, etc. However, because the frequency conversion speed regulation system usually runs at medium and low speeds, the mechanical characteristics are poor, and the system efficiency and power factor are obviously reduced. However, the compressor motor of inverter air-conditioning system runs at medium and low speed most of the time, and only runs at high speed when it is turned on, so this greatly discounts the energy-saving superiority of inverter air-conditioning. On the contrary, SRD system has excellent speed regulation performance and higher conversion efficiency of electric energy to mechanical energy, especially at middle and low speeds. Therefore, it can effectively overcome the disadvantages of variable frequency speed regulation system and make energy saving more effective. Generally speaking, air conditioning is a high energy-consuming household appliance. If it can save energy by more than 5%, it will surely gain greater economic and social benefits. 3.4 Application in Electric Vehicles and Drives Because the exhaust gas of fuel vehicles seriously pollutes the environment, it is inevitable for society to develop and improve pollution-free electric vehicles. In order to develop electric vehicles, in addition to the high-energy sealing of on-board batteries, the motor speed regulation system with excellent performance and efficiency should be used as the driving force. SRD system has high efficiency, high reliability, wide speed range, excellent starting and braking performance, and is one of the most ideal power sources for various electric vehicles. In addition, the following means of transportation have been developed and used abroad: electric bicycles and motorcycles, buses, wheelchairs, golf carts, lawn mowers and small electric cars. 3.5 Development of high-speed running application Because the SRM motor is durable, the switching frequency requirement is relatively low, and it can be driven at high speed when the laminated performance and bearings meet the requirements, so developing high-speed SRD system is another application direction. According to relevant data, the United States has developed a high-speed SRD prototype with a rotating speed of 25000 r/min and a power of 90Kw for the application of space technology, and its effective motor material is only 10kg. 4. Conclusion Although SRD system appeared late in China, and its industrialization lagged behind, its characteristics have not been understood by the majority of users. However, due to its excellent control performance, SRD system can replace the AC variable frequency speed regulation system which is still widely used in some fields, especially in some places where the existing speed regulation system is not competent. Therefore, it is certain that the switched reluctance motor speed control system is expected to shine in the 2 1 century.
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