For the mechanical characteristics of the switched reluctance motor, so that its mechanical characteristics are good because the starting torque is greater than the rated torque of 2-3 times. The power converter is the provider of the energy required for the operation of the switched reluctance motor, and is the switching component that connects the power supply to the motor windings. Through it the power supply energy fed into the motor, but also the magnetic field within the motor energy storage feedback back to the power supply, the power conversion circuit used in the switching components for the fast insulated gate bipolar transistor (IGBT). Theory and practice have proved that: SRD system in the unit volume torque value, efficiency, inverter volt-ampere capacity and its performance parameters, can compete with the current frequency conversion speed control system. The machine type in the torque / rotational inertia ratio has a greater advantage, especially the two critical speed of the, so that a wide range of variable, controllable factors, is a more desirable new type of speed control system. On this occasion, it is necessary to point out in particular, it is different, SRD system is very easy to change the motor's mode of operation and control parameters to achieve different performance characteristics and to meet the special performance indicators, especially when the use of microcontroller or DSP single-chip programmable microprocessor chip for the control core, often only through the modification of the software, it will be able to meet the user's many different performance requirements. With the continuous progress of scientific and technological capabilities, as well as the level of semiconductor integrated control technology, SRD system has a series of products, a variety of small and medium power SRD system in different industrial sectors and household appliances have been applied. 2, the characteristics of the SRD system is mainly manifested in: ＊ starting current is small (≤ 30% of the rated current), the starting torque is large, greater than the rated torque of 2 - 3 times; ＊ speed range; speed ratio of more than 20:1, smooth speed infinity; ＊ good load characteristics; high stability and precision, in the case of changes in the size of the load, the rotational speed to maintain the same speed stability accuracy ≤ plus or minus 0.5%; ＊ high efficiency of the system from the low-speed, high-speed to high-speed, system efficiency are up to 85%, and the system efficiency is up to 85%, and the system efficiency is up to 85%. High system efficiency, from low speed, medium speed to high speed, the system efficiency reaches more than 85%; * Mechanical structure is solid, maintenance-free operation; * With the characteristics of low current and large torque during startup, the motor and controller have small current impact during startup, and the heat generation is smaller than that during continuous rated operation; * In braking operation and electric operation, it also has excellent torque output capability and working characteristics. Therefore, it is suitable for frequent starting or frequent forward and reverse operation, the conversion frequency can be up to 1000 times / h. Because of the above characteristics, it can be developed in a wide range of applications. 3, switched reluctance motor speed control system (SRD) applications switched reluctance motor speed control system (SRD) has a very wide range of applications, with the continuous progress of scientific and technological capabilities, as well as semiconductor integrated control technology to improve the level of the SRD system has been a series of products, a variety of power SRD system in different industrial sectors and household appliances and the defense and military applications. Such as the need for frequent start, stop, fast and frequent forward and reverse rotation and need to be in a wide range of speed control equipment. Such as gantry planer and milling machine in machinery industry, reversible rolling mill, flying saw, flying shear, electrode lifting and lowering of electric arc furnace in metallurgy industry, scientific research and test equipment, medical equipment, food, printing machinery, automobile, electric locomotive and space technology, household appliances and so on. 3.1 Application in gantry planer Gantry planer is a common machine tool for processing large metal planes, and its cutting process is as follows: the crossbeam and the side tool holder move on the column, the vertical tool holder moves left and right on the crossbeam, and the table where the workpiece is located makes a straight-line reciprocating motion on the guide rail. Table drive motor alone is required: * can frequently and quickly realize the start, brake and forward and reverse rotation, and can automatically and smoothly change speed in the linear reciprocating motion. * can be in ≥ 20 speed ratio range of smooth speed regulation. *After the workpiece eats the tool, the speed is not less than 95% of the speed before eating the tool. *The inrush current is limited to the permissible value when changing direction at any speed. * table in the reciprocating direction of the cutting point over the cutter distance does not exceed 7 Bom, and can realize a good braking. In the past, most of the use of DC motors and DC speed control system, although in the performance to meet the needs, but the shortcomings are: complex structure, large size, troublesome operation, maintenance, low efficiency, high energy consumption. In recent years, the use of SRD, eliminating the speed reducer, simplify the structure, facilitate the operation, reduce energy consumption, reduce costs. 3.2 For textile "edge detection" equipment After the textile industry "edge detection" and "centering" equipment for practical use, achieved better results. As "edge detection" equipment power, its reaction speed is less than 0.3s, that is, when the motor is running, after receiving the instruction, can be realized within 0.3s reversal, and requires continuous and frequent operation within 24 hours, and at the same time requires stepless speed regulation in a wide range. These functions are difficult to realize in the frequency conversion speed control system. 3.3 For household appliances: will overcome the defects of today's washing machines and air conditioners, refrigerators, become a new generation of more perfect products. 3.3.1 At present, there are two main categories of modern washing machines widely used in the world: one is the wave-type automatic washing machine, and the other is the drum-type automatic washing machine. These two types of washing machines on the motor has **** the same performance requirements: that is, when washing to motor low-speed rotation, and can adapt to frequent forward and reverse; dehydration to motor high-speed rotation. To this end, they all use a 2-pole / 16-pole variable-pole double-speed single-phase asynchronous motor, barely meet the requirements of the use, but there are poor speed performance and low efficiency (generally below 30%), start-up current is large (especially for frequent positive and negative washing conditions when it reaches the rated current of more than 7 - 8 times). The use of SRD system instead of the original 2-pole / 16-pole variable-pole two-speed single-phase asynchronous motor, can overcome the above defects. Because SRD system has wide speed range, it can make "washing" and "dehydration" work at the best speed; SRD system's good starting performance can eliminate the impact of the starting current on the power grid during the washing process, and make the washing and commutation smooth and noiseless; It realizes high efficiency in all speed regulation ranges and greatly reduces power consumption. 3.3.2 air conditioners, refrigerators, the core component is the compressor, mostly driven by a single-phase asynchronous motor compressor, for the two-position on and off temperature control, so the system efficiency and power factor are low, and the temperature of the range of ups and downs. Moreover, the start-up of the current is large on the power grid has a serious impact. Although in recent years there are "frequency conversion air conditioning" new products, it uses asynchronous electric frequency conversion speed control system to replace the single-phase asynchronous motor air conditioner and access to the refrigeration speed, running noise, high efficiency, energy saving and other superiority, but due to the frequency conversion speed control system is usually running in the middle and low-speed, the mechanical characteristics of the poor, the system efficiency and power factor drop Obviously. And inverter air conditioning system compressor motor precisely most of the time running in the medium and low speed, only just open will run at high speed, so this gives the energy-saving superiority of inverter air conditioning greatly discounted. On the contrary, the SRD system has excellent speed control performance, higher electrical energy - mechanical energy conversion efficiency, especially in the middle and low speed, the advantage is particularly prominent. Thus, it can effectively overcome the disadvantages of frequency conversion speed control system, making energy saving more effective. In general, air conditioning are high energy-consuming home appliances, if you can save more than 5% energy, will certainly get a greater economic and social benefits. 3.4 in the electric car and drive on the application of fuel car emissions due to serious pollution of the environment, so the development and improvement of non-polluting electric vehicles is a social inevitability. The development of electric vehicles in addition to the accompanying battery to have a high energy seal, then there is a very superior performance and efficiency of the motor speed control system for power. The SRD system has high efficiency, high reliability, wide speed range, excellent starting and braking performance, which is one of the most ideal power for all kinds of electric vehicles. In addition to this, foreign countries are also developed and used in the following vehicles: electric bicycles and electric motorcycles, public **** cars, wheelchair vans, golf carts, lawnmowers, small electric cars. 3.5 Development of high-speed operation applications Because the SRM motor has a sturdy and relatively low switching frequency, so in the laminated performance and bearings to meet the conditions for high-speed transmission and operation, as the development of high-speed SRD system is another application direction. According to the relevant information, the United States for space technology applications developed 25000r/min, 90Kw high-speed SRD prototype, its motor effective material is only 10Kg. 4, conclusion Although the SRD system system in China appeared later, industrialization work lags behind, its characteristics are not yet understood by the majority of users, but due to the SRD system has a very good control performance, which makes certain Areas can replace the AC frequency conversion speed control system is still widely used, especially in some of the existing speed control system is difficult to play a role in the place. For this reason, it is certain that the switching reluctance motor speed control system can be expected in the 21st century to show their splendor.
(I looked elsewhere, I am also learning electronic control, after reading a little gain, see if you can find useful after reading it~~)