I just had some equipment fabricated to use a Dayton (Grainger) 1Z833 gearmotor and cannot change the form factor for the mount at this point.
The motor specifications are: 12VDC permanent magnet parallel shaft 1/6HP 14 amp and it is a brushed motor. The motor will have a light load and so I do not need full power and probably not full speed either.
I purchased two different motor speed controllers to try out so I can have computer control of the speed. One is the Pololu Jrk 12v12 USB Motor controller with Feedback (12A continuous, 30A peak). The other is a Dimension Engineering SyRen 25 (25A continuous, 45A peak).
When I looked into the motor manual, it had a statement that said "Dayton low voltage DC gearmotors operate on non-pulsating DC power or filtered full wave rectified power with a form factor not exceeding 1.05. Operation with power supplies providing a form factor above 1.05 must require a derate of gearmotor torque rating."
When I spoke with the Grainger technical support person, he did not have a clear explanation as to why a PWM motor controller should not be used. He mentioned such things as perhaps gear lash (which with a PWM at a high frequency does not make sense to me) and said that there must be some reason for the manufacturer's statement in the booklet. He claimed the motor controllers they sell use a series of SCRs and they maintain a constant 12V output and they modulate the current (which also does not make sense to me). Unfortunately, their controllers adjust speed using a potentiometer and I need computer control (either using a D/A output or serial connection).
I will only need to run the motor in one direction, do not need braking, and I can ramp the speed up and down if I have to but I would need to do that within about one second.
I should have read the fine print before, but I thought that one could use a DC motor controller on any brushed DC motor (but it’s too late now and I have to work with the equipment I have). Can I use either of the motor controllers I purchased or is there a real reason they should not be used? How should I proceed--is there another motor controller that would work for this application?
Thanks,
Dale
The motor specifications are: 12VDC permanent magnet parallel shaft 1/6HP 14 amp and it is a brushed motor. The motor will have a light load and so I do not need full power and probably not full speed either.
I purchased two different motor speed controllers to try out so I can have computer control of the speed. One is the Pololu Jrk 12v12 USB Motor controller with Feedback (12A continuous, 30A peak). The other is a Dimension Engineering SyRen 25 (25A continuous, 45A peak).
When I looked into the motor manual, it had a statement that said "Dayton low voltage DC gearmotors operate on non-pulsating DC power or filtered full wave rectified power with a form factor not exceeding 1.05. Operation with power supplies providing a form factor above 1.05 must require a derate of gearmotor torque rating."
When I spoke with the Grainger technical support person, he did not have a clear explanation as to why a PWM motor controller should not be used. He mentioned such things as perhaps gear lash (which with a PWM at a high frequency does not make sense to me) and said that there must be some reason for the manufacturer's statement in the booklet. He claimed the motor controllers they sell use a series of SCRs and they maintain a constant 12V output and they modulate the current (which also does not make sense to me). Unfortunately, their controllers adjust speed using a potentiometer and I need computer control (either using a D/A output or serial connection).
I will only need to run the motor in one direction, do not need braking, and I can ramp the speed up and down if I have to but I would need to do that within about one second.
I should have read the fine print before, but I thought that one could use a DC motor controller on any brushed DC motor (but it’s too late now and I have to work with the equipment I have). Can I use either of the motor controllers I purchased or is there a real reason they should not be used? How should I proceed--is there another motor controller that would work for this application?
Thanks,
Dale