I’m looking for guidance on what size (amperage) motor driver.
Motors are 350w, 24v brushed. The project is a robot mower for steep inclines.
Recommendations on brands and models are appreciated.
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Hi @Dcurtis and welcome to our forum.
To calculate the nominal current of a 24V 350W DC motor, you can use the power formula:
[ P = V \times I ]
where:
- ( P ) is the power in watts (W),
- ( V ) is the voltage in volts (V),
- ( I ) is the current in amperes (A).
Given that the power ( P ) is 350 watts and the voltage ( V ) is 24 volts, you can rearrange the formula to solve for ( I ):
[ I = \frac{P}{V} ]
[ I = \frac{350W}{24V} ]
[ I = 14.58A ]
So, the nominal current for the motor would be approximately 14.58 amperes. However, it’s important to consider that the actual current can vary depending on the efficiency of the motor and the applied load. If you’re integrating this motor into a project and need more specific guidance, it would be good to have datasheet of this motor.
Regarding the motor driver. You can see here which motor drivers RobotShop sell:
One of the most popular brands are Sabretooth motor drivers:
Assuming that you want to control two of the DC motors, and that nominal current is around 15 amps, these model should be suitable for you:
I hope this helps. Feel free to ask anything else.
Thank you.
These motors are from a wheelchair and there are no datasheets available. This unit will be climbing a steep incline, most likely running horizontally to mower, I am curious if the 2x32 was sufficient.
14.58 amp was my calculation, as well. How much can this peak if climbing up hill? and how long can this peak be maintained? I’ve read motors can peak at 6 times or 10 times their amperage so? 87.48a? 145.80a?
Can I add two motors per channel to get 4x4? (if I went to the 2x60) - I’ve read, when motors are in parallel they may not turn equally (one stalls/doesn’t turn). thus I may need two drivers (front and back).
thanks again
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I am not sure about the stall current, without the datasheet of the motor. I would assume it is somewhere between 5-10 times of the nominal current.
If you want to add two motors per channel, then you should go with 2x60 version. It can withstand 120A per channel for a short period of time.
I would agree that using two controllers in parallel should be better, you just need to think on how to sync and connect everything.