Driving a 12V DC motor in PWM mode
Driving a 12V DC motor in PWM mode
(OP)
Hi,
I want to drive a DC motor with a bridge in PWM mode, a little Maxon with a coil inductance of 0.4mH. I'll use an integrated H-bridge driver like the National LMD18200.
How can I calculate the ideal drive frequency for the PWM? Would I need some snubber circuitry?
Felixc
I want to drive a DC motor with a bridge in PWM mode, a little Maxon with a coil inductance of 0.4mH. I'll use an integrated H-bridge driver like the National LMD18200.
How can I calculate the ideal drive frequency for the PWM? Would I need some snubber circuitry?
Felixc





RE: Driving a 12V DC motor in PWM mode
RE: Driving a 12V DC motor in PWM mode
Thanks.
Felix
RE: Driving a 12V DC motor in PWM mode
RE: Driving a 12V DC motor in PWM mode
Thanks guys.
Felixc.
RE: Driving a 12V DC motor in PWM mode
increasint switching frequency will not allow this current to build through the armature to give drive force.
On the other hand, too low switcing frequecy will only cause the movement to be not smooth, you will notice that and increase it to a smooth level. remember it you make zero frequency, the motor runs( at max speed of cource) but at too much high frequency, will cause the armature inductance to appear open circuit to the high frequency.
RE: Driving a 12V DC motor in PWM mode
RE: Driving a 12V DC motor in PWM mode