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參數(shù)資料
| 型號(hào)： | AN6657S |
| 廠商： | PANASONIC CORP |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Micromotor Forward/ Reverse Electronic Governors |
| 中文描述： | BRUSH DC MOTOR CONTROLLER, 0.7 A, PDSO16 |
| 封裝： | 0.225 INCH, PANAFLAT, PLASTIC, SO-16 |
| 文件頁(yè)數(shù)： | 4/6頁(yè) |
| 文件大小： | 71K |
| 代理商： | AN6657S |
ICs for Motor
AN6657, AN6657S
I
Supplementary Explanation
Principle of Functioning
The AN6657 and the AN6657S are the electronic
governors which control the motor speed constantly by
making use of the fact that the counter electromotive force
generated in the motor winding is proportional to the motor
speed when the DC motor rotates. They have two motor drive
systems which correspond to the forward and reverse
rotations, respectively. The inter-pin voltage of the motor Em
is given by the following expression.
Em = Ea + Ra Ia
Ea : Motor reverse electromotive voltage
Ra : Motor internal resistor
Ia : Motor current
There are the following relationships between the motor
reverse electromotive voltage Ea and Motor speed, and motor
torque T and motor current Ia, respectively.
Ea = Ka · N
T = K
T
· Ia
Ka : Motor generation constant
K
T
: Motor torque constant
In the expression (1), the inter-pin voltage of the motor Em
includes the voltage Ra · Ia which changes depending on
motor current Ia. The counter electromotive voltage Ea is
taken out by configuring the bridge circuit and used as a motor
speed signal. In Fig. 1, the motor speed N (
∝
motor generated
voltage Ea) in the motor control state can be expressed by the
following formula.
r
2
+ r
3
r
3
r
4
+ r
5
+ V
CE SAT1
The expression (4) applies in case of motor forward rotation,
in which a current flows from the motor +
motor –
motor reverse rotation, in which a current flows form the
motor –
+
+V
CE SAT2
V
REF
: Reference voltage, Ra : Motor internal resistor
Ia : Motor current
r
2
, r
3
: Diffusion resistance in the IC, r
4
, r
5
: Resistance for
speed control
r
1
: Torque control Resistance
V
CE SAT1
: Forward/reverse drive circuit saturation voltage
when motor forward rotation is set
V
CE SAT2
: Forward/reverse drive circuit saturation voltage
when motor reverce rotation is set
(1)
Ea = V
REF
r
2
+ r
3
r
3
·
r
4
+ r
5
r
5
+
r
1
r
2
r
3
– Ra Ia
(4)
(5)
Ea = V
REF
·
r
5
+
r
1
r
2
r
3
– Ra Ia
Forward/
Reverse
Constant Speed/
Fast Forward
S/S
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
Amp.
0.022
μ
F
+
–
M
NC
r
1
V
CC
Drive Mode
Switching Logic
Reference
Voltage
Forward/
Reverse
Drive Circuit
r
3
r
2
1k
10k
2SD2249
or
2SD2177
2SD2249
or
2SD2177
0.01
μ
F
r
6
4.3k
1kB
15k
680
Ra
Ea
4.7
μ
F
Ra : Motor-coiled resistor
Ea : Motor counter electromotive voltage
: Oscillation preventive capacitor
: Prevention of motor noise
2
1
<
2
1
=
+
–
Fig.1 AN6657/AN6657S Motor Control Basic Circuit
r
4
r
5
(2)
(3)
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