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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)： | 7/20頁 |
| 文件大小： | 97K |
| 代理商： | SZA1015TT |
2001 Jul 11
7
Philips Semiconductors
Product specification
Brushless Motor Controller (BMC12)
SZA1015
The BMC12 regenerates V
EMF
and superimposes
V
M
(0
≤
I
M
≤
I
LIM
) which depends on the E
C
(gain) input
voltage. V
RM
(I
M
) can be positive (accelerate) or negative
(brake).
Motor current limiting function
The maximum motor current is determined with the
following formula:
I
LIM
is a fraction of the maximum motor current I
MAX
.
During accelerating and braking the motor current will not
exceed the limiting current set by R
LIM
.
The formula to determine the limiting current is as follows:
R
OSC
Back-EMF regeneration
The back-EMF voltage is internally regenerated. The ratio
between R
EMF
and R
OSC
can be used to scale the internal
EMF regeneration. The value of resistor R
EMF
depends on
the type of motor (k-factor, number of pole pairs) and the
motor supply voltage used. This is shown in the following
10
3
×
PP
×
formula:
For noise reduction the Hall signals are internally filtered.
handbook, halfpage
MGT193
VM1
VRM
k
VRM
VM2
VEMF
2
VEMF
2
VDDM
2
VM
ω
(rad/s)
Fig.6 Motor voltage when actively braking.
I
MAX
V
R
switches(min)
+
R
motor
-------------------------------------------------------
=
handbook, halfpage
0
50
0
20
MGT194
40
60
80
10
20
30
40
RLIM (k
)
% of IMAX
Fig.7
Maximum output current as a function of
R
LIM
.
R
OSC
= 47 k
.
I
LIM
R
I
MAX
×
=
R
EMF
k
----------N
2.6
×
R
OSC
×
V
DDM
=
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