AN0885 brushless DC (BLDC) motor fundamentals

... Figure 5, CWDC motors employ both a series and a shunt field The performance of a CWDC motor is a combination of SWDC and SHWDC motors CWDC motors have higher torque than a SHWDC motor while ... to SWDC motors is that they not have precise speed control like PMDC and SHWDC motors have FIGURE 4: DC Voltage Supply SERIES-WOUND DC MOTORS Series Field Armature Brush PERMANENT MAGNET DC...

Ngày tải lên: 22/12/2013, 14:15

... electromagnetictorque when just torque iS controlled _ without flux control under 1.2 N m load with non- ideal trapezoidal back- EMF ,1 (reference torque is 1.225 N m) (a) the back- EMF is not ideally ... the control of a nonsinusoidal brushless dc motor, " in Proc IFEE-JECON Annu Meeting, Orlando, FL, Nov 610, 1995, vol 2, pp 836-843 [9] M Ehsani, R C Becerra, "High-s...

Ngày tải lên: 03/01/2014, 19:44

... therefore in this paper a new transformation which preserves the same advantages as the Park transformation A Mathematical Model of the BDCM We suppose that the motor has the following typical features ... pulsating torque (the homopolar part) and a two-phase motor with a rotating field (the "ap" The classical Park transformation is, in fact, the succ...

Ngày tải lên: 03/01/2014, 19:44

... torque control of brushless DC motor based on back- EMF vector’ , ELECTROMOTION pp 128-138, 2009 [7] S B Ozturk and H A Toliyat, “Sensorless Direct Torque and Indirect Flux Control of Brushless DC Motor ... control of brushless dc motor with non- sinusoidal back- EMF, ” in Proc IEEE-IEMDC Biennial Meeting, Antalya, Turkey, May 3-5, 2007 [6...

Ngày tải lên: 03/01/2014, 19:45

... maximum torque As a result, in this study, stator flux linkage amplitude is OZTURK AND TOLIYAT: DIRECT TORQUE AND INDIRECT FLUX CONTROL OF BRUSHLESS DC MOTOR TABLE I SWITCHING TABLE FOR DTC OF BLDC MOTOR ... well OZTURK AND TOLIYAT: DIRECT TORQUE AND INDIRECT FLUX CONTROL OF BRUSHLESS DC MOTOR Fig Steady state and transient behavior of the...

Ngày tải lên: 03/01/2014, 19:46

... 1709 Salih Baris Ozturk and Hamid A Toliyat, Direct torque control of brushless dc motor with non- sinusoidal back- EMF, ” in Proc IEEE-IEMDC Biennial Meeting, Antalya, Turkey, May 3-5, 2007, vol ... the control of a nonsinusoidal brushless dc motor, ” in Proc IEEE-IECON Annu Meeting, Orlando, FL, Nov 6-10, 1995, vol 2, pp 836–843 Y Liu, Z Q Zhu, and D Howe, Direc...

Ngày tải lên: 03/01/2014, 19:46

... improve the performance of the Brushless DC Motor drives The vector- control principle in dq synchronously rotating frame is utilized for the generation of current references only, and the motor currents ... proposed Pseudo- vector Control for BLDCM drives III PRINCIPLE OF PSEUDO- VECTOR CONTROL In the conventional square-wave phase current control (Fig 2), for...

Ngày tải lên: 03/01/2014, 19:46

... OffsetRead ? Yes Start ADC No Change ADC input to Motor Terminal A Is ADC Done? No Yes ADCOffset = ADC Result Invert msb of ADC Offset State = OffsetRead PWMThreshold = ADCRPM + ADCOffset Limit PWMThreshold ... ADCON1 ; ADC left justified, AN0 only banksel ADCON0 ; setup ADC (bank0) movlw B’11000001’ movwf ADCON0 bsf clrf call clrf ADCON0,GO LastSensor Commutate ADC ; ADC clock from int RC,...

Ngày tải lên: 30/03/2014, 07:20

... auxiliary salient poles Comparison of conventional and brushless dc motors Although it is said that brushless dc motors and conventional dc motors are similar in their static characteristics, they ... 48531 EMS – Chapter 12 Brushless DC Motors PM ac Motor DC Supply Position Sensor Logic Circuit Electronic Commutator Fig.2 Brushless dc motor = Permanent magnet ac...

Ngày tải lên: 22/12/2013, 14:15

... FIELD - WEAKENING BASED ON REACTIVE POWER WITH BLDC MOTOR The electrical machinery power is composed by the active power and the reactive power[ 9]-[10] In the static α − β frame, the active power ... control with permanent over speed area The principle of stator control based on reactive power theory for BLDC motor is described by formula A Chart of...

Ngày tải lên: 03/01/2014, 19:47

... the DSP controller together with the inner loop controller Both the sinusoidal current control and the instantaneous torque control are tested with the speed controller The time response of the ... simulated torque from the motor model is used as the feedback torque signal, i.e the feedback is ideal Therefore, the simulated performance of the controller...

Ngày tải lên: 03/01/2014, 19:52

... OF AC INDUCTION MOTORS Generally, induction motors are categorized based on the number of stator windings They are: • Single-phase induction motor • Three-phase induction motor Single-Phase Induction ... Winding Single-Phase AC Induction Motor with Start Mechanism DS00887A-page AN887 Split-Phase AC Induction Motor The split-phase motor is also known as an induct...

Ngày tải lên: 25/01/2014, 13:20

... and design of rotational brushless permanent- magnet (PM) motors Brushless dc, PM synchronous, and PM step motors are all brushless permanent- magnet motors These specific motor types evolved over ... engineered motor systems Why a book on brushless permanent- magnet motor design? This book is motivated by the ever increasing use of brushless permanent- magnet moto...

Ngày tải lên: 02/07/2014, 08:20

... of magnetic material, air gaps, and slotted magnetic structures were developed The properties of ferromagnetic and permanent- magnet materials were discussed A magnetic circuit model of a permanent ... of a permanent magnet Because of its importance in brushless PM motors, it is important to consider the coenergy stored in the magnetic field of magnetic circuit containing a PM For...

Ngày tải lên: 02/07/2014, 08:20

... Trapezoidal Motors In practice there are two common forms of brushless PM motors: motors having a sinusoidal back emf, which are commonly referred to as ac synchronous motors, and trapezoidal back emf motors, ... commonly called brushless dc motors Of these, the ac synchronous motor has been around the longest, especially with wound field excitation The brushless dc motor evolved fr...

Ngày tải lên: 02/07/2014, 08:20