The pace already was become into electromotor except the 3rd kind of electromotor beyond dc motive and AC motor. Traditional electromotor changes unit as Electromechanical energy, the effect that there is a key in electrification process is entered in human production and life. But be in what human society enters automation period today, the function of traditional electromotor already cannot satisfy all sorts of motion such as factory automation and OA to control systematic demand. To get used to these requirements, developed a series of new electromotor systems that have control function, have him characteristic relatively among them, and application is the pace enters electromotor a very extensive kind. Closely related the development that the pace takes electromotor and computer industry. Since the pace enters electromotor to replace small-sized dc motive in computer peripheral equipment, make the function of its equipment rises, promoted a pace to take the development of electromotor immediately. On the other hand, microcomputer and number control technical development, the step that will implement a part as numerical control system again enters electromotor promotion to use other field, machine tool of the treatment that be like report, small-power machining machine tool, measure instrument, optics and medical treatment instrument and package machine to wait. A kind of any courses that produce {TodayHot} to taste maturity, basically be the process that norms breed is united stage by stage and simplifies. Now, the development that the pace takes electromotor already end is sheet paragraph the magnetoresistive type of type construction, Composite is mixed the magneto of claw pole structure 3 kinds. Claw pole electric machinery is low-cost, function index is not high, composite and magnetoresistive type basically regard high resolution as electromotor, have control into electromotor as a result of Composite pace power is little, it is better to run smooth sex and be in dominant position stage by stage. The most typical product is 2 photographs 8 extremely the electromotor of 50 tine, step pitch horn 1.8° ／ 0.9° (half pace of whole situation ／ ) ; Still have 5 looks 10 extremely 50 tine with a few rotor the 2 photographs of 100 tine and 5 photographs pace enter electromotor, 5 photographs electromotor basically is used at running the circumstance with higher performance. Arrive at present, the magnetoresistive type situation of industrial developed country enters electromotor to seldom already saw. The pace enters the manufacturing country with the biggest electromotor is Japan, reach NPM company to wait like Japanese servo company, Oriental company, SANYO DENKI and MINEBEA, especially Japanese Oriental company, no matter be electromotor function and exterior quality, still produce a measure, can says is the world go up best. Japanese pace produces per year a quantity into electromotor now (contain foreign solely invested company) nearly 200 million. Germany also is the pace on the world produces big country into electromotor. German B.L. 5 interblend joined the company 1994 after type situation expires into electromotor patent, rolled out new three interblend to add up to type situation to take electromotor series, for stator 6 extremely rotor 50 tine structure, electric current of form a complete set driver, every turn pace number is 200, 400, 1000, 2000, 4000, 10000 with 20000, it is had normally 2 photographs and the resolution that 5 photograph paces submit electromotor, still can go up in this foundation again 10 fractionize, resolution raises 10 times, this is a kind of very good plan, handled the function of technology of electric current drive adequately, let three-phase electromotor have 2 photographs and the property of 5 photograph electromotor at the same time. Meanwhile, japanese servo company also rolled out their three interblend to add up to type situation to enter electromotor. Doctor of text of this company slope developed 3 kinds of different magneto three-phase situations to enter electromotor, namely HB (Composite) , RM sex (stator and Composite likeness, rotor is the same as magneto annular magnet is similar) and claw pole PM. Be the same as three-phase pace 2 photographs pace to make after comparing, show into electromotor into electromotor: ⑴ is in win respect of horn of small step pitch, three-phase electromotor compares 2 photographs electromotor to be close friends. The two-phase excitation of ⑵ three-phase electromotor is the biggest retentivity quadrature is √3T1 (T1 is single-phase excitation torsion) , and 2 photographs electromotor is √2T1, the synthetic moment of force of three-phase electromotor is so large. The torsion wave motion of ⑶ three-phase electromotor wants than 2 photographs electromotor small. ⑷ three-phase electromotor is successive 2 paces differ those who compare 2 photographs electromotor to want with the torsion at half pace small. Winding of ⑸ three-phase electromotor is OK astral form join, 3 terminal drive, excitation circuit transistor 6; And 2 photographs electromotor is 8. When ⑹ runs continuously, because three-phase pace takes electromotor structure account, 3 harmonic of magnetic flux and electric current were eliminated, so the oscillatory torque ratio of three-phase electromotor of 2 photographs electromotor want small. Conclusion is clearly. Another conclusion are HB electromotor more agree with utility of low speed big torsion; RM apply to move smoothly and the utility that rotate speed is more than 1000r/min; And PM cost is low, in the big torsion respect when the vibration when {HotTag} low rotate speed and high rotate speed, three-phase PM electromotor is close friends than the function of two-phase electromotor. Accordingly, currently most those who develop prospect should belong to Composite pace to enter electromotor, and Composite electromotor to the following 4 way develop: Develop one of tendencies, it is to continue to develop along the direction of miniaturization. Widen as what electromotor itself uses a field and of all kinds and overall ceaseless miniaturization, requirement to it the electromotor of form a complete set also must smaller and smaller, in 57, the electromotor of 42 baseplate date applied old hind, now its baseplate date to 39, 35, 30, 25 direction are down outspread. Swiss ESCAP company still develops an external diameter recently only the pace of 10mm enters electromotor. Those who develop a tendency, it is to change circular electromotor to be quadrate electromotor. Because electromotor is used square model structure, make rotor possible design more greatly than the circle, consequently bulk of its moment of force is compared will rise greatly. With the electromotor of appearance baseplate date, of quadrate torque ratio circle will raise 30 ％ ～ 40 ％ . Develop a tendency, undertake be designinged integratedly to electromotor. Namely rotor position sensor, decelerate gear design integratedly together with electromotor noumenon, such making that its can form system of a closed circuit conveniently, have more superior control performance consequently. Develop a tendency, develop to 5 photographs and three-phase electromotor direction. The 2 photographs that use extensively at present and 4 photographs electromotor, its vibration and noise are bigger, and 5 photographs and three-phase electromotor have advantage sex. And with respect to these two kinds of electromotor character, the drive circuit of 5 photographs electromotor is more complex than three-phase electromotor, because the performance/price ratio of system of this three-phase electromotor wants,compare 5 photographs electromotor betterer. The circumstance of our country differs somewhat, till 20 centuries 80 time, it is magnetoresistive type situation takes regnant place into electromotor all the time, composite pace enters electromotor is 80 time later period just begins to develop, remain type of 2 kinds of structures to coexist at the same time up to now. Although new Composite step enters electromotor to replace magnetoresistive type electromotor completely possibly, but of magnetoresistive type electromotor overall won long-term application, relatively familiar also to its technology, especially the step pitch part that typical Composite situation takes electromotor (0.9°/1.8° ) the step pitch horn with typical magnetoresistive type electromotor (0.75°/1.5° ) different, the user changes structure of this kind of product is not very easy, this makes the situation that two kinds of type coexist is changed inside shorter time hard. The development that this kind of current situation takes electromotor to the pace is adverse.
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