Brushed Servo Motor Driver: 3A

[Mike]

I'm looking for a servo motor driver to drive a ~3A continous brushed
DC motor. Voltage will most likely be 24-48. The motor driver has to
accept a +/-10v input which I am told is a 'standard.' This input
translates to likely motor velocity/current.

I'm using the Baldor NextMove ESB (which has 3 axis of servo motor
control)

http://www.baldor.com/products/motioncontrol/nmesb.asp

to control a much larger servo controller (15A continous). In addition
I have two other motors that I need drivers for.

Anyone have any suggestions? Baldors drivers for these smaller motors
are a bit of an over kill. I need to find motor drivers that can
handle this current range and accept this standard +/- 10v input.

Thank you.

Mike

 

[Glenn Gundlach]

Mike wrote:

I'm looking for a servo motor driver to drive a ~3A continous brushed
DC motor. Voltage will most likely be 24-48. The motor driver has to
accept a +/-10v input which I am told is a 'standard.' This input
translates to likely motor velocity/current.

I'm using the Baldor NextMove ESB (which has 3 axis of servo motor
control)

http://www.baldor.com/products/motioncontrol/nmesb.asp

to control a much larger servo controller (15A continous). In addition
I have two other motors that I need drivers for.

Anyone have any suggestions? Baldors drivers for these smaller motors
are a bit of an over kill. I need to find motor drivers that can
handle this current range and accept this standard +/- 10v input.

Thank you.

Mike

I did an analog MDA for a film machine with brush 'pancake' motors.
Normal forward run maybe 3-5 volts at 1A but during shuttle with a 2000
foot load it can hit 20 volts with momentary peaks of 35 amps (OK, it
was a full speed forward to full reverse to see if it blows up. It
doesn't). The amplifier itself looks VERY much like a big audio unit
with 4 17 amp transistors in parallel on the + and - 35V rails. The
main difference is the feedback comes from ground return resistor(s) of
the motor rather than the output. Its just a big transconductance amp.

Setting the control range to +/- 10 V is one resistor value.

For efficiency, class-D amplifier would be a lot better but it really
isn't a problem with analog in this machine.

Good luck on this.
GG

 

[Chris Jones]

Mike wrote:

I'm looking for a servo motor driver to drive a ~3A continous brushed
DC motor. Voltage will most likely be 24-48. The motor driver has to
accept a +/-10v input which I am told is a 'standard.' This input
translates to likely motor velocity/current.

I'm using the Baldor NextMove ESB (which has 3 axis of servo motor
control)

http://www.baldor.com/products/motioncontrol/nmesb.asp

to control a much larger servo controller (15A continous). In addition
I have two other motors that I need drivers for.

Anyone have any suggestions? Baldors drivers for these smaller motors
are a bit of an over kill. I need to find motor drivers that can
handle this current range and accept this standard +/- 10v input.

Thank you.

Mike

You could try:
http://www.4qd.co.uk/
They make fairly robust DC motor controllers which easily handle your power
requirement, though usually the control comes from a pot e.g. throttle
grip, not a servo system. On some of their pages they refer to
modifications for use in servos.

Chris