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參數(shù)資料
| 型號： | SZA1015TT |
| 元件分類： | TVS-瞬態(tài)抑制二極管 |
| 英文描述： | Transient Voltage Suppressor Diodes |
| 中文描述： | 電機(jī)控制器 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 97K |
| 代理商： | SZA1015TT |
2001 Jul 11
6
Philips Semiconductors
Product specification
Brushless Motor Controller (BMC12)
SZA1015
FUNCTIONAL DESCRIPTION
Motor control
The control input voltage E
C
is converted into a digital
value (D
C
) by the ADC where voltage E
CR
is the midpoint
reference for E
C
(see Fig.3).
The gain from input voltage (E
C
) to motor current (I
M
) is
I
LIM
/E
CR
(A/V). The motor current can be determined with
I
E
CR
the following formula:
The maximum motor current I
LIM
is set by the motor
current limiter. When the rotational speed of the motor has
become zero the motor current is switched off and all
driver outputs (pins U, V and W) are connected to ground.
This prevents the motor of spinning backwards.
Internal motor voltage generation
The simplified motor schematic in Fig.4 shows the series
resistance and back-EMF voltage of the motor.
If we assume that I
MACC
is used to accelerate and I
MBR
is
used to brake we can draw two pictures shown in Figs 5
(accelerate) and 6 (brake).
handbook, halfpage
MGT190
reverse torque brake
forward torque
(
DC)
(
+
DC)
IM =
+
ILIM
IM = 0
EC = 2
×
ECR
EC = ECR
EC = 0 V
Fig.3 Motor control.
I
M
----------
E
C
E
CR
–
(
)
×
=
handbook, halfpage
MGT191
+
+
VM1
IMBR
IMACC
VM2
VRM (IM
×
)
VRM (IM
×
)
VEMF
2
VEMF
2
Fig.4 Simplified motor schematic.
handbook, halfpage
MGT192
VM1
VRM
k
VRM
VM2
VEMF
2
VEMF
2
VDDM
2
VM
ω
(rad/s)
Fig.5 Motor voltage when accelerating.
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