This produces much more power and torque than I need, and has a potential draw of over 100A
Can I use an RB-Cyt-133 controller and expect it to limit current and survive?
I only need 30 amps maximum.
I am using it as a low duty cycle lift engine on a motorcycle at 12 volts.
It will be controlled by microcontroller.
Which output should I use? Can I directly use a pulse-width modulated control
signal, or some other?
What other precautions and additional equipment do I need? I expect the motor
to generate hefty voltage spikes.
Do I needed to put a capacitor in the circuit somewhere? How big?
Where is the best place? I already intend to stick a bank of capacitors over the battery.
Do you have a datasheet for the 12V motor you are planning to drive with the RB-Cyt-133 ?
If your 12V motor draw 100A, the RB-Cyt-133 won’t work and will probably fry. It can handle only 80Amps (peak for 1 second) and 30Amps continuously.
The ‘‘OSMC’’ 160A, 13V to 36V Motor Controller might be a better fit.
The motor is cheap new on ebay, and the correct gear-reduced dc brush motor doesn’t seem to be readily
available. There are no spec sheets available for the motor. peak output power and current draw are from similar motors.
I don’t need fine torque control,
but want to be able to “park” the load without hitting the buffer at full speed, .75 m/s.
This places excess motor inertia loads on the drivetrain.
I am planning on using a rotary encoder tacho. My initial plan is to use contactor blips of 0.1 seconds, 0.1 to 0.2
seconds apart. I think the contactor can handle that.
Load is 5 kgs at 3:1 reduction, driving a screw with 10mm lead, nominally 1500 rpm no-load.
Actual no-load speed more like 0.75 m/s (The motor is rated at 700 W output) giving .75 x 15
= 113 W needed. I possibly want 3 x torque under acceleration conditions, at nominally 60 % efficiency, = 47 amps estimate.
Efficiency is a lot lower under starting and acceleration under load, so 100 amps requirement is not
unreasonable, I suppose. I don’t want to spend 3x the motor price on a controller, so I will try
fast-cycling the contactor for now. I will come back again if that is not successful.
