【導(dǎo)讀】層傾角≦16°，煤質(zhì)中硬或是硬的綜采工作面。本說明書主要介紹了采煤機(jī)截割部的設(shè)計(jì)計(jì)算。動(dòng)，最后驅(qū)動(dòng)滾筒旋轉(zhuǎn)。截割部采用四行星單浮動(dòng)結(jié)構(gòu)，減小了結(jié)構(gòu)尺寸，采用大角度彎搖臂設(shè)計(jì)，加大了過煤空間，提高了裝煤效果。件進(jìn)行了設(shè)計(jì)計(jì)算、強(qiáng)度校核和選用。

　　

【正文】 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, 1 ( ) 11 ( ) 1 ( 1 ) 1 ( )e=()gfk i k p k kk k knnD k e K e eD D D???? ? ? ?? ? ? where, ng is the given rotor speed, nf is the practical rotor speed, e is the difference of the rotor speed, 1( )kD? 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. 山東科技大學(xué)學(xué)士學(xué)位論文 38 The output power of the Switched Reluctance motor drive system is approximately in proportion to the average DC supplied current of the power converter as follows, 2 inpI? where, P2 is the output power of the Switched Reluctance motor drive system, Iin is the average DC supplied current of the power converter. In the Switched Reluctance motor 2, the triggered signals of the main switches in the power converter are also modulated by PWM signal. The balancing the distribution of the loads between the two Switched Reluctance motors could be implemented by fuzzy logic algorithm. In the fuzzy logic regulator, there are two input control parameters, one is the deviation of the average DC supplied current of the power converter between the two Switched Reluctance motors, and the other is the variation of the deviation of the average DC supplied current of the power converter between the two Switched Reluctance motors. The output control parameter is the increment of the duty ratio of the PWM signal of the Switched Reluctance motor 2. The block diagram of the double Switched Reluctance motors parallel drive system for the electrical traction in shearer was shown in Figure 3. The deviation of the average DC supplied current of the power converter between the two Switched Reluctance motors at the moment of ti is 12i in ine I I??: . 1i i ie e e??? where, ei1 is the deviation of the average DC supplied current of the power converter between the two Switched Reluctance motors at the moment of ti1. The duty ratio of the PWM signal of the Switched Reluctance motor 2 at the moment of ti is 2 ( ) 2 ( 1 ) 2 ( )i i iD D D?? ? ? where, 2()iD? is the increment of the duty ratio of the PWM signal of the Switched Reluctance motor 2 at the moment of ti and D2(i1) is the duty ratio of the PWM signal of the Switched Reluctance motor 山東科技大學(xué)學(xué)士學(xué)位論文 39 2 at the moment of ti1. The fuzzy logic algorithm could be expressed as follows, if ~~if E iE? and ~~EC jEC? then U ~~U UU? i = 1,2,… , m, j = 1,2, … ,n where, E~ is the fuzzy set of the deviation of the average DC supplied current of the power converter between the two Switched Reluctance motors, E~C is the fuzzy set of the variation of the deviation of the average DC supplied current of the power converter between the two Switched Reluctance motors, and U~ is the fuzzy set of the increment of the duty ratio of the PWM signal of the Switched Reluctance motor 2. The continuous deviation of the average DC supplied current of the power converter between the two Switched Reluctance motors could be changed into the discrete amount at the interval [5, +5], based on the equations as follows, 山東科技大學(xué)學(xué)士學(xué)位論文 40 []10220eiee INT K eK?? The discrete increment of the duty ratio of PWM signal of the Switched Reluctance motor 2 at the interval [5, +5] could be changed into the continuous amount at the interval [%, +%], based on the equations as follows, 12 ( ) []100 .0 2iDDD I NT K DK??? There is a decision forms of the fuzzy logic algorithm based on the above principles, which was stored in the programme storage cell of the controller. While the difference of the distribution of the loads between the two Switched Reluctance motors could be got, the duty ratio of PWM signal of the Switched Reluctance motor 2 will be regulated based on the decision forms of the fuzzy logic algorithm and the distribution of the loads between the two Switched Reluctance motors could be balanced. IV. TESTED RESULTS The developed double Switched Reluctance motors parallel drive system prototype had been tested experimentally. Table I gives the tests results, where 1? is the relative deviation of the average DC supplied current of the power converter in the Switched Reluctance motor 1, 2? is the relative deviation of the average DC supplied current of the power converter in the Switched Reluctance motor 2, and, 1211122 100%2in ininin inIIIII?????? 山東科技大學(xué)學(xué)士學(xué)位論文 41 1222122 100%2in ininin inIIIII?????? 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%? V. CONCLUSION The paper presented the double Switched Reluctance motors parallel drive system for the electrical traction in shearer. The novel type of the shearer in coal mines driven by the Switched Reluctance motors drive system contributes to reduce the fault ratio of the shearer, enhance the operational reliability of the shearer and increase the benefit of the coal mines directly. The drive type of the double Switched Reluctance motors parallel drive system could