1、 英文原文 Switched Reluctance Motors Drive for the Electrical Traction in Shearer H. Chen College of Information and Electrical Engineering China University of Mining & Technology, Xuzhou 221008, China AbstractThe paper presented the double Switched Reluctance motors parallel drive system for the elect
2、rical traction in shearer. The system components, such as the Switched Reluctance motor, the main circuit of the power converter and the controller, were described. The control strategies of the closed-loop rotor speed control with PI algorithm and balancing the distribution of the loads with fuzzy
3、logic algorithm were given. The tests results were also presented. It is shown that the relative deviation of the average DC supplied current of the power converter in the Switched Reluctance motor 1 and in the Switched Reluctance motor 2 is within 10% Keywords- switched reluctance； motor control； s
4、hearer； coal mine； electrical drive I. INTRODUCTION The underground surroundings of the coal mines are very execrable. One side, it is the moist, high dust and inflammable surroundings. On the other side, the space of roadway is limited since it is necessary to save the investment of exploiting coal
5、 mines so that it is difficult to maintain the equipments. In the modern coal mines, the automatization equipments could be used widely. The faults of the automatization equipments could affect the production and the benefit of the coal mines. The shearer is the mining equipment that coal could be c
6、ut from the coal wall. The traditional shearer was driven by the hydrostatic transmission system. The fault ratio of the hydrostatic transmission system is high since the fluid in hydrostatic transmission system could be polluted easily. The faults of the hydrostatic transmission system could affect
7、 the production and the benefit of the coal mines directly. The fault ratio of the motor drive system is lower than that of the hydrostatic transmission system, but it is difficult to cool the motor drive system in coal mines since the motor drive system should be installed within the flameproof enc
8、losure for safety protection. The motor drive system is also one of the pivotal parts in the automatization equipments. The development of the novel types of the motor drive system had been attached importance to by the coal mines. The Switched Reluctance motor drive could become the main equipments
9、 for adjustable speed electrical drive system in coal mines 1, because it has the high operational reliability and the fault tolerant ability 2. The Switched Reluctance motor drive made up of the double-salient pole Switched Reluctance motor, the unipolar power converter and the controller is firm i
10、n the motor and in the power converter. There is no brush structure in the motor and no fault of ambipolar power converter in the power converter 34. The Switched Reluctance motor drive could be operated at the condition of lacked phases fault depended on the independence of each phase in the motor
11、and the power converter 5. There is no winding in the rotor so that there is no copper loss in the loss and there is only little iron loss in the rotor. It is easy to cool the motor since it is not necessary to cool the rotor. The shearer driven by the Switched Reluctance motor drive had been develo
12、ped. The paper presented the developed prototype. II. SYSTEM COMPONENTS The developed Switched Reluctance motors drive for the electrical traction in shearer is a type of the double Switched Reluctance motors parallel drive system. The system is made up of two Switched Reluctance motors, a control b
13、ox installed the power converter and the controller. The adopted two Switched Reluctance motors are all three-phase 12/8 structure Switched Reluctance motor, which were shown in Figure 1. The two Switched Reluctance motors were packing by the explosion-proof enclosure, respectively. The rated output
14、 power of one motor is 40 KW at the rotor speed 1155 r/min, and the adjustable speed range is from 100 r/min to 1500r/min. Figure 1.Photograph of the two three-phase 12/8 structure Switched Reluctance motor The power converter consists of two three-phase asymmetric bridge power converter in parallel
15、. The IGBTs were used as the main switches. Three-phase 380V AC power source was rectificated and supplied to the power converter. The main circuit of the power converter was shown in Figure 2 Figure 2. Main circuit of the power converter . In the controller, there were the rotor position detection
16、circuit, the commutation circuit, the current and voltage protection circuit, the main switches gate driver circuit and the digital controller for rotor speed closed-loop and balancing the distribution of the loads. III. CONTROL STRATEGY The two Switched Reluctance motor could all drive the shearer
17、by the transmission outfit in the same traction guide way so that the rotor speed of the two Switched Reluctance motors could be synchronized. The closed-loop rotor speed control of the double Switched Reluctance motors parallel drive system could be implemented by PI algorithm. In the Switched Relu
18、ctance motor 1, the triggered signals of the main switches in the power converter are modulated by PWM signal, the comparison of the given rotor speed and the practical rotor speed are made and the duty ratio of PWM signal are regulated as follows, where, is the given rotor speed, is the practical r
19、otor speed, is the difference of the rotor speed, is the increment of the duty ratio of PWM signal of the Switched Reluctance motor 1 at k time, is the integral coefficient, is the proportion coefficient, ek is the difference of the rotor speed at k time, ek-1 is the difference of the rotor speed at k-1 time, D1(k) is the duty ratio of PWM signal
