[major]

Anybody know how to get the Max RPMs and Amps for this 36v 4HP Motor?

https://www.ebay.com/itm/282268890824?ViewItem=&item=282268890824

Although the armature could withstand higher, I'd limit application to 6000 RPM Max and like 4000 crusing. It probably will do 100 to 125 Amps continuously when well ventilated with tolerance for bursts of up to maybe 800 Amps peak on accelerations. Looks like a nice motor.

major

 

[cyberpine]

Although the armature could withstand higher, I'd limit application to 6000 RPM Max and like 4000 crusing. It probably will do 100 to 125 Amps continuously when well ventilated with tolerance for bursts of up to maybe 800 Amps peak on accelerations. Looks like a nice motor.

major

You think this could push 2500lbs of car 20mph?

 

[cricketo]

Although the armature could withstand higher, I'd limit application to 6000 RPM Max and like 4000 crusing. It probably will do 100 to 125 Amps continuously when well ventilated with tolerance for bursts of up to maybe 800 Amps peak on accelerations. Looks like a nice motor.

major

It is a DC motor, right ? So 3kW = 36v x 83A. For more power output it probably is better to bump the voltage, not the amps. Additionally, given it's a purpose-built motor for a forklift, I wouldn't be surprised if the max RPMs are around 3000.

 

[major]

It is a DC motor, right ? So 3kW = 36v x 83A. For more power output it probably is better to bump the voltage, not the amps. Additionally, given it's a purpose-built motor for a forklift, I wouldn't be surprised if the max RPMs are around 3000.

Hi cricket,

I'm familiar with these types of forklift motors. Yes, obviously it is a commutator DC motor, undoubtedly series wound. The 3kW rating refers to output power, so your current calculation is low. It may be purpose built for the Hyster truck, but GE will have used components and processes manufacturing it common to the product line which I'm sure will support my RPM values. I've analyzed a number of their products of this type.

Regards,

major

 

[cricketo]

Hi cricket,

I'm familiar with these types of forklift motors. Yes, obviously it is a commutator DC motor, undoubtedly series wound. The 3kW rating refers to output power, so your current calculation is low. It may be purpose built for the Hyster truck, but GE will have used components and processes manufacturing it common to the product line which I'm sure will support my RPM values. I've analyzed a number of their products of this type.

Regards,

major

Very cool, thank you for elaborating on it!

 

[major]

You think this could push 2500lbs of car 20mph?

I don't like to give conversion performance estimates. But I suspect the forklift had a loaded GVWR of 12,000 - 16,000 lbs. And top speed of 8 mph. So what do you think?

 

[remy_martian]

You think this could push 2500lbs of car 20mph?

If you ran solid tires, maybe.

But you're going to piss a lot of people off while "accelerating" from stoplights and on encountering the slightest incline in the road.