【正文】 W型采煤機截割部的改進(jìn)[J].煤礦機械,2005,(6):101103.英文翻譯Switched Reluctance Motors Drive for the Electrical Traction in ShearerAbstract—The paper presented the double Switched Reluctance motors parallel drive system for the electrical traction in shearer. The system ponents, such as the Switched Reluctance motor, the main circuit of the power converter and the controller, were described. The control strategies of the closedloop rotor speed control with PI algorithm and balancing the distribution of the loads with fuzzy 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 177。10%.Keywords switched reluctance。 motor control。 shearer。 coalmine。 electrical driveI. INTRODUCTIONThe 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 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 cut 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 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 enclosure 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 bee the main equipments 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 doublesalient pole Switched Reluctance motor, the unipolar power converter and the controller is firm in 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 [3][4]. 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 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 theSwitched Reluctance motor drive had been developed. The paper presented the developed prototype.II. SYSTEM COMPONENTSThe 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 box installed the power converter and the controller. The adopted two Switched Reluctance motors are all threephase 12/8 structure Switched Reluctance motor, which were shown in Figure 1. Figure 1. Photograph of the two threephase 12/8 structure Switched Reluctance motorThe two Switched Reluctance motors were packing by the explosionproof enclosure, respectively. The rated output 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. The power converter consists of two threephase asymmetric bridge power converter in parallel. The IGBTs were used as the main switches. Threephase 380V AC power source was rectificated and supplied to the power converter. The main circuit of the power converter was shown in Figure 2.In the controller, there were the rotor position detection circuit, the mutation circuit, the current and voltage protection circuit, the main switches’ gate driver circuit and the digital controller for rotor speed closedloop and balancing the distribution of the loads.III. CONTROL STRATEGYThe two Switched Reluctance motor could all drive the shearer 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 closedloop rotor speed control of the double Switched Reluctance motors parallel drive system could be implemented by PI algorithm. In the Switched Reluctance motor 1, the triggered signals of the main switches in the power converter are modulated by PWM signal, the parison of the given rotor speed and the practical rotor speed are made and the duty ratio of PWM signal are regulated as follows,where, ng is the given rotor speed, nf is the practical rotorspeed, e 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, Ki is the integral coefficient, Kp is the proportion coefficient, ek is the difference of the rotor speed at k time, ek1 is the difference of the rotor speed at k1 time, D1(k) is the duty ratio of PWM signal of the Switched Reluctance motor 1 at k time, and D1(k1) is the duty ratio of PWM signal of the Switched Reluctance motor 1 at k1 time.The output power of the Switched Reluctance motordrive system is approximately in proportion to theaverage DC supplied current of the power converter as