tb6551fag TOSHIBA Semiconductor CORPORATION, tb6551fag Datasheet - Page 12

• Manufacturer Part Number: tb6551fag
• Description: 3-phase Full-wave Sine-wave Pwm Brushless Motor Controller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

with the triangular wave and a sine-wave PWM signal is generated.
falling (or rising) edges is counted. The counted time is used as the data for the next 60° phase of the
modulation waveform.
item is 1/32 of the time width of the 60° phase of the previous modulation waveform. The modulation
waveform moves forward by this width.
time (1) from HU: ↓ to HW:.↑ Similarly, data (2)
HW: ↑ to HV: ↓.
same time width until the next edge occurs.
every electrical angle of 60°. Thus, when the Hall device is not placed in the correct position or during
accelerating or decelerating, the modulation waveform is not continuous at every reset.
The modulation waveform is generated using Hall signals. The modulation waveform is then compared
The time (electrical angle: 60°) from the rising (or falling) edges of the three Hall signals to the next
There are 32 items of data for the 60° phase of the modulation waveform. The time width of one data
In the above diagram, the modulation waveform (1)
If the next edge does not occur after the 32 data items end, the next 32 data items move forward by the
The modulation wave is brought into phase with every edge of the Hall signal.
The modulation wave is reset in synchronization with the rising and falling edges of the Hall signal at
S
V
HU
HV
HW
S
S
Sw
U
V
* t = t(1) × 1/32
*t
*t
1
(5)
2
3
4
(6)
5
6
32 data items
(6)’
(1)
(1)’
(1)’
(2)
12
'
moves forward by the 1/32 time width of the time (2) from
(2)’
(3)
30
31
'
data moves forward by the 1/32 time width of the
32
(3)’
* HU, HV, HW: Hall signals
TB6551FG/FAG
2008-12-24