Apply the brake of three-phase electromotor specific power consumption and technology are improved
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Keywords: Electric Motor; Make To Move; Technique three-phase electromotor, especially three-phase asynchronous electromotor has wide application in producing practice. Part of the rotor when working as a result of electromotor has inertial, it is so after dump, electromotor still can continue to turn the ability after period of time stops. In real electromotor work, assist man-hour to shorten, improve the work efficiency that produces machine, ensure mechanical, electromotor and person safety, requirement electromotor can jockey quickly or often invert, this has science, effective apply the brake to electromotor with respect to need. To the apply the brake of electromotor, ask the rotational way of its torsion and rotor is opposite namely. In recent years, rise as what electromotor manufactures a technology and managing model social construction, managing the sources of energy and the new task that raise work efficiency to already became people to consider, how to improve the efficiency of apply the brake of electromotor, the article combines academic physics and electromotor use technical discuss. One, principle of apply the brake of specific power consumption. Apply the brake of specific power consumption is in namely cut off three-phase power source while, put through direct current source, make dc electric current connects stator winding, if pursue,1 is shown. Academic physics tells us, the magnetic field of dc electric current is fixed immobile, and because rotor is inertial continue to turn in former direction, the direction of the rotor electric current that decides here not hard according to right hand formula and left hand formula and the torsion that interaction of fixed magnetic field produces. On real issue, the way that right now the direction of torsion turns with electromotor fitly is opposite, had the effect of apply the brake consequently. Theory and experiment prove, the size of the size of torsion of apply the brake and dc electric current is concerned. The size of dc electric current is electromotor commonly 0 of rated electric current.
5 ∽ 1 times. Graph energy of this kind of apply the brake uses up principle of apply the brake of 1 specific power consumption small, apply the brake is smooth, but need direct current source. This kind of braking method is used in some machine tools. Because suffer the effect of electric current of electromotor of apply the brake, the size of dc electric current is restricted, working especially the environment is opposite power of electromotor of abominable, three-phase falls relative to bigger case again, apply the brake of executive specific power consumption has the difficulty of one. Wanting key of apply the brake of use specific power consumption is to should be chosen match good direct current source and the use technology that notices switch of direct current source, avoid by all means is operated by accident, wiring of avoid by all means is wrong. In the power source of motive of the dc in apply the brake of dc specific power consumption, come from commonly at alternating current road, obtain through rectification, as the application of high-power commutate integrated circuit and development, the commutate of circuit electric current often rectifies direction of stabilized voltage of integrated circuit of flow direction high-power, commutate to develop by diode, accordingly, choice good power matchs, voltaic moderate, satisfy the design of circuit of demand of apply the brake of specific power consumption, it is the key that solves a problem. Use at having heavy facility when electromotor, especially the hoisting of machining workshop, shift, when moving, should apply dc machine to communicate apply the brake the goal instead, because use this kind of method, it is good to stabilize function on one hand, output volts d.c. automatically equably by circuit, control dc inverts electromotor, get stable pure linear volts d.c. , implementation electromotor inverts, apply the brake communicates electric machinery. If pursue,2 are shown. Graph the control line road of apply the brake of 2 electromotor specific power consumption 2, the technology is improved. From the graph 2 we see not hard, the apply the brake of specific power consumption of this kind of electromotor, advocate if pass time relay,a delay time of KT disconnects often open contact to come true, because afterwards report contactor controls systematic machinery contact much, wiring complex, dependability tall, versatility mixes low, power comsumption flexibility is poorer also, because this cannot satisfy the control requirement with modern production complex and changeful process, especially the development as computer advanced technique and application, can make up Cheng controller (PLC) application, implemented automation. Can make up Cheng controller (PLC) be it is core with the processor central, the advanced technique such as integrated computer and automata develops the controller of a kind of industry that rise. Its biggest characteristic is dependability tall, function perfect, combination agile, process designing is simple and power is low a lot of distinctive characteristics, be applied in electromotor control widely. Type selecting of Nextpage1, PLC keeps the I/O surplus that has 20% and technical cost considering PLC, choose PLC of 3 water chestnut, the value is inferior, small-sized - 16MR. 2, main circuit its main circuit is shown 3 times like the graph. Pursue 3 main circuit 3, I/O end allocates input end to allocate I to carry functional remarks X0SB1 to stop X1SB2 to start X2FR to heat up protection to output end allocation O to carry apply the brake of Y1KM2 of power supply of functional remarks Y0KM1 4, PLC wiring X1 X2 X3 X4 X5 X6 X7 COM X0 FX2N - of X03 ANI of of of Y02 LNI of X11 OR of of 0 LD of 380V KM2 KM2 KM1 KM1 5 of ～ of 16MR Y0 Y1 Y2 Y3 COM N L Y6 Y7 Y5 Y4 SB1 SB2 FR, program CNC Milling