0 to 24 VDC output to DC Motor to vary speed

CJC504

Hi,
I have a DC Motor that is rated at 3.5A at 24V. It is a NISCA NC5475. I would like to be able to send a 0 - 24 VDC signal to the motor from the BS2 in order to vary the speed of the motor. Can someone please suggest an simple way to do this? I own a HB-25, but the HB-25 only seems capable of outputting 13.8VDC. Is there another way to easily do this such as a beefed up LM358 voltage follower circuit? Any help would be appreciated. Thanks!

Chris Claudet

nisca_motor_NC5475.pdf

Mike Green

Normally motors of this type are not supplied with a variable voltage (like 0 to 24). That's very very inefficient and doesn't allow the motor to have full torque at low speeds. What's normally done is to supply the motor with full voltage, but turn that on and off rapidly so the motor sees an average voltage between 0 and whatever. That's exactly what the HB-25 does. There are other similar controllers on the market that handle higher voltages. Pololu is one manufacturer that has controllers that should be able to handle your motor.

PJAllen

I haven't tried my H-Bridge at 24V, but here's a practical example of PWM'ing a motor.