脉宽调制直流电动机控制电路 Pulse Width Modulation Motor Control
Ofn, people attempt to control DC mots with a variable resistor or variable resistor connected to a transistor. While the latter approh works well, it generates heat and hence wastes power. This ple pulse width modulaon DC motor control eliminates these problems. It controls the motor speed by driving the motor with short pulses. These pulses vary in duration to change the speed of the motor. The longer the pulses, the faster the motor turns, and vice versa.
Schemat
Parts
Part |
Total Qty. |
Description |
stitutions |
R1 |
1 |
1 Meg 1/4W Resistor |
|
R2 |
1 |
100K Pot |
|
C1 |
1 |
0.1uF 25V Ceic Disc Capacitor |
|
C2 |
1 |
0.01uF 25V Ceramic Disc Capacitor |
|
Q1 |
1 |
I511 |
IRF620 |
U1 |
1 |
4011 CMOS NAND Gate |
|
S1 |
1 |
DPDT Switch |
|
M1 |
1 |
Motor (See Notes) |
|
MISC |
1 |
Case, Board, Heatsink, Knob For R2, Socket For U1 |
Notes
1. R2 justs the speed of the oscillator and therefore the speed of M1.
2. M1 be any DC motor that operates from 6V and does not draw more than the um current of Q1. The voltage can be increased by connecting the higher voltage to the switch instead of the 6V that powe the oscillator. Be sure not to exceed the power rating of Q1 if you do this.
3. Q1 will need a heatsink.
4. Q1 in the parts list can handle a maximum of 5A. Use the IRF620 for 6A, if you need any higher.
