Hi all,
I am having a big problem in driving the servo motor with input in the range of +/-10V with arduino
as i attached a op amp circuit in between to drive the motor upto a +10V but my motor is not moving easily in anti clock wise direction as my op amp circuit is no able to deliver a voltage in upto 0 to -10V.
so can u plz help me how can i solve this using any other circuit to move the motor in both clock/anti clock easily using the arduino.
Motor Data
Values at nominal voltage
1 Nominal voltage V 15.0
2 No load speed rpm 6720
3 No load current mA 20.7
4 Nominal speed rpm 5060
5 Nominal torque (max. continuous torque) mNm 15.7
6 Nominal current (max. continuous current) A 0.762
7 Stall torque mNm 63.6
8 Starting current A 3.01
9 Max. efficiency % 84
Characteristics
10 Terminal resistance
4.99
11 Terminal inductance mH 0.528
12 Torque constant mNm / A 21.2
13 Speed constant rpm / V 451
14 Speed / torque gradient rpm / mNm 106
15 Mechanical time constant 14.7
16 rotor inertia 13.2
It is a servo motor fixed in a ball and beam device
thanx for reply.
Actually it might be a DC motor where it is having single i/p port with +/-10V and a ground terminal.
the circuit iam using is to drive the motor is a feedback op amp circuit with feedback resistance 560k and i/p resistance 260k with ic741 op amp.
which gives an o/p voltage of nearly 10V but it drives my motor in clock wise direction but not able to move in anti clock wise direction easily.
i need to balance ball on beam which is attached to motor. which can able to drive motor in both clock/anti clock wise directions i.e., in range of 10v to 0 to -10v
so i need a circuit which can drive my motor in this range as according to ball position.
Just because they used a -10V to 10V motor does not mean that you have to, too.
does the arduino can read -10v to +10v in its analog input pins??
If not at what voltage range they can read in analog input pins??
if i want to make it read in that range do i need a external vol.divider circuit?
It can read 0 to +V (whatever that means for your Arduino - typically 3.3V or 5V). Positive values outside that range will require a voltage divider to get them in that range. Negative values require an op-amp to offset them to positive.