Thread: Help me understand this dc motor please

You need a dc supply capable of supplying
25A. A transformer would also need a rectifier, probably a filter (capacitor bank, reasonable size) as the speed controller may get upset if the input voltage drops off every cycle.

Also, if you really need 1hp, then you will need to gear down about 10 to 1, so the motor at full speed will drive your wheel at 280rpm at full power.
You might get by with a smaller reduction though if you don't need the full horse.

36V DC gear motor brushless electric motor 500w Go-kart sprocket efficiency | eBay

May be better. Need to find a suitable controller though. And power supply.

You will need to supply the circuit with 36V DC so a rectifier from the transformer is required.

The controller is designed to run off a battery so it probably require a very stable rectifier.

An alternative would be to run off a 36V battery with a suitable battery charger. The motor may require extra cooling if run for a long time at a very low speed.

Thanks for the replies guys.

The response that I might be better off running it off a battery has got me thinking. A battery might be better because there is no power in our garage/shed and I don’t want to get any laid in as the shed will be demolished one day soon. Also, there are advantages in making it portable.

Would this battery be suitable ? ?

36V 10S4P 30Ah 500W High power&capacity 42V 18650 lithium battery pack ebike electric car bicycle motor scooter with BMS – Grandado

In terms of run time, I doubt that it would ever be used for more then 2 hours - and even then it’s fairly stop-start so there’s probably about 50-70 mins actual running in that period. Speed would be constantly varying within that range mentioned. So we’re talking about spinning a 1-2lb lump of clay, with someone pressing down moderately hard on it at times. Would this battery be likely to cover that need? ?

Originally Posted by russ57

36V DC gear motor brushless electric motor 500w Go-kart sprocket efficiency | eBay

May be better. Need to find a suitable controller though. And power supply.

Russ57, can you tell me please why this one might be better? Is it because it is brushless?

Also, quick look at Venco website (respected manufacturer) I see that 1/2 hp is sufficient. I have used their 1/2 hp machine and it is very capable.

It delivers its power at 500rpm, which is much closer to what you need. A 2:1 reduction will drop it to 250 and that is much easier to achieve. Brush less is more efficient, and guessing the rated power is input not output its probably not far off the power of the 800w motor.
Id think a battery pack designed for a scooter will work fine.

Something like this might be easier to adapt
450W 36V DC Motor Gear Reduction Motor Kit 6pcs E-Bike Sprocket Throttle Grip | eBay
Speed controller included, as well as a chain and output sprocket, and would run happily off the battery you linked for around 2 hrs or more depending on usage. You would need to buy a suitable charger for the battery as well.