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1、Brushless DC motor and its control technology developmentJ.S.LawlerUniversity of Tennessee Knoxville,Tennessee UDC 621.313:620.178.53Abstract: This article introduces brushless DC component and its development situation, analyses the current brushless DC motor for further in-depth research problems,
2、 and points out the development direction.Keywords: Brushless DC motor; Review; Control; Electronic commutation circuit; The rotor position detection circuit1 IntroductionWith its excellent DC torque characteristic motion control to widely, but common DC motivation to change and mechanical brush, bu
3、t poor *, etc. When in the electromagnetic interference and noise, the impact of the DC motor control system in further applications. With shortcomings overcome machinery commutation, electronic commutation replace machinery commutation brushless motors. In 1955 arrison D.H America as the first appl
4、ication in transistors replaced machinery commutation circuit, marks the patent brush brushless motor modern. And electronic commutation brushless DC motor, is really into practical stage in 1978 MAC classic brushless DC motor and the driver. Later, the international brushless DC motor is studied, h
5、as developed square-wave brushless motor brushless DC motor and the sine wave. For more than 20 years, permanent new materials, microelectronics technology, automatic control technology and electronic technology, especially the power switch device, brushless motor development to progress. Brushless
6、DC motor has been originally with electronic commutation DC motor, there is normally BLDCM external characteristics of electronic commutation motor.Brushless DC motor keep the traditional DC good dynamic and static characteristics, and the speed of simple structure, easy operation and control. The a
7、pplication of military industry, from initial to aerospace, medical appliance, information, and the rapid development in industrial automation. Translated from Izmeritelnaya Tekhnika,No.10,pp.35-37,October,1995.0543-1972/95/3810-1131512.50 9 Plenum Publishing CorporationThe structure, and have BLDCM
8、, brushless DC motor stator windings as the armature winding consists of permanent magnetic materials and excitation replaced. Armature current waveform into different, can be divided into BLDC motor (BLDCM) torque-current DC motor (sine waves and new all-digital fuzzy), electronic BLDCM commutation
9、 replace original DC motor machinery commutation, magnetic materials, saves the brush to make the rotor, But new all-digital fuzzy is replaced by permanent magnet synchronous motor rotor windings, saves the excitation of field winding, sliping and brush. Under the same conditions, the driver circuit
10、 was easier to control, square, a simple application to extensive new all-digital fuzzy BLDCM.Brushless DC motor by electronic commutation circuit commonly, the rotor position detection circuit and motor is composed of three parts, electronic ontology commutation circuit control and driven by genera
11、l part of rotor position detection, and position sensors usually use to finish. When the work place, the controller of motor rotor position sensors in each driver circuit orderly trigger power tube, orderly, to drive in DC motor. From the three parts of brushless motivation of its development were a
12、nalyzed.2 Each component of development2.1 Motor ontologyBrushless dc motor electromagnetic structure and a BLDCM are basic and same, but it is the armature winding put on weight of the stator, rotor adoptted, simplify the structure and improve the performance, so that it can be * * to enhance sexua
13、l. Brushless permanent magnet motor development and development is inseparable, magnetic materials development process basically has the following several development stages experience: aluminum nickel-cobalt, ferrite materials, NdFeB (NdFeB). With high energy and nd-fe-b magnetic materials appear c
14、aused a revolution. The third generation of nd-fe-b materials, further reducing the motor with copper, prompted brushless motors to efficiency, miniaturization, energy development direction.At present, to improve the motor power density, transverse magnetic field, its permanent magnet motor stator t
15、ooth and armature coils space position, the main motor are perpendicular to the motor axial magnetic flux, the structure to improve the circulation of air-gap flux density, can provide more than most traditional motor output torque. This type of motor is in research and development stage.2.2 Electro
16、nic commutation circuitControl circuit, brushless dc motor control power switching device driver circuit to control motor speed, steering, and protect the torque motor, including over-current, over-voltage, overheating protection, etc. Control circuit, control circuit of initial analogue simpler. Digital circuit, many hardware work can be directly by software, can reduce the hardware circuit and improve its, also can improve
