... bill.alexander@idealpowerconverters.com
Abstract—This paper presents a direct torque control (DTC)
technique for brushless dc (BLDC) motors with non-
sinusoidal back- EMF using four- switch inverter in the
constant torque region. This approach ... 4730
Direct Torque Control of Four- Switch Brushless
DC Motor with Non- sinusoidal Back- EMF
Sal...
...
αβ
–
plane.
Direct Torque and Indirect Flux Control of Brushless DC Motor with
Non- sinusoidal Back- EMF without position sensor
Abstract: In this paper, the position sensorless direct torque ...
conduction DTC of BLDC motor drive with six -switch inverter
scheme.
Keywords: Brushless dc (BLDC) motor, sliding mode
observer, direct torq...
... programming-based control of brushless motors,”
IEEE Trans. Control Syst. Technol., vol. 11, no. 1, pp. 139–146, Jan. 2003.
[19] S. J. Kang and S. K. Sul, Direct torque control of brushless dc motor with
nonideal ... “Sensorless Direct Torque and Indirect Flux Control of Brushless DC
Motor with Non- sinusoidal Back- EMF presented at the 2008 IEEE In...
... techniques
Torque ripple is the main concern of the BLDCM because
it limits this kind of motor from many applications. There are
three main sources of torque production (and therefore of the
torque ... ripple) in BLDCMs: cogging torque, reluctance
torque, and mutual torque [1]. The torque ripple can be
reduced by (a) motor design; (b) control means; (c) or both o...
... to DC Drive)
BEMF(drive on)
BEMF(drive off)
(PWM at 75% Duty Cycle)
Floating Terminal Back EMF
0
0.5
1
30 90
Electrical Degrees
Voltage (Normalized to DC Drive)
BEMF(drive on)
BEMF(drive off)
(PWM ... ; Set ADC GO, RA0->ADC
sBEMFRead equ sBEMFIdle+1 ; Wait for ADC nDONE, Read ADC->Vbemf
sBEMF2Idle equ sBEMFRead+1 ; Wait for Timer1 compare, Force Drive on and wait 9 uSec,
; Set A...
...
circuits with a unity power factor and the load current is
continuous [13]
3
tdcdc
PVIVI==
(3)
Where, V
dc
, I
dc
are DC side voltage and current, respectively.
The mean value of DC voltage ... following,
3
2
dc LL
VV
π
=
(6)
3
6
dc
VV
π
=
(7)
From (3) and (7), the equation of I
dc
and I, concisely
expressed is obtained.
6
dc
II
π
=
(8)...