HPM-10kw rpm

[Hunne_128]

Hi there!

For my project i need a 10kw motor with about 6000 rpm. Due to lack of experience i just bought one off Golden Motor (HPM 10kw 48V) which was rated up to 6000 rpm on their website.
As for the controller i went with the VEC 500. Unforunately this setup never went past 4300 rpm, even without load. In my understanding the max rpm are limited by the controller so i tought of bying a Adaptto Max-E. Would this get me somewhere near 6000 rpm? And what rated amps could get through with some cooling modifications?

If its not possible with this motor, which should i use instead?

And if i get the new controller at what price could i sell the old one? It was only used for testing, so it schould not be damaged or something...

Thank you for your help!

 

[justarandomer]

Up the battery voltage to around 67V

 

[riba2233]

You got the wrong version of motor for your voltage. I don't understand why do people just throw 800$ without getting familiar with options and what do they mean. Answer for your problem is either to up the voltage, or use a controller that has field weakening (adapto has).

 

[Hunne_128]

Up the battery voltage to around 67V

i allready tried adding another 12V with no success :/

You got the wrong version of motor for your voltage. I don't understand why do people just throw 800$ without getting familiar with options and what do they mean. Answer for your problem is either to up the voltage, or use a controller that has field weakening (adapto has).

Thank you for your answer! I feel stupid myself, but when you're new to the topic its fairly hard to determine which specs are important.

 

[riba2233]

Well each motor has Kv constant. It tells you maximum rpm per volt without field weakening. So, the more voltage you have, motor will spin faster. But, there are same motors with different Kv, like your golden motor. So, there are three options, 48V, 72V, 96V. Each will reach same rpm, but at different voltages. They do say 6000 rpm, but realistically it's around 4500 rpm at nominal voltage. So, you can chose let's say 48V motor, but run it on 72V, and you will get higher rpm.

 

[Punx0r]

You increased the supply voltage by 12V and there was no increase in full throttle, no load speed of the motor?!

 

[Hunne_128]

Well each motor has Kv constant. It tells you maximum rpm per volt without field weakening. So, the more voltage you have, motor will spin faster. But, there are same motors with different Kv, like your golden motor. So, there are three options, 48V, 72V, 96V. Each will reach same rpm, but at different voltages. They do say 6000 rpm, but realistically it's around 4500 rpm at nominal voltage. So, you can chose let's say 48V motor, but run it on 72V, and you will get higher rpm.

Wouldn't that destroy the insulation of the copper windings?

 

[Hunne_128]

You increased the supply voltage by 12V and there was no increase in full throttle, no load speed of the motor?!

The output voltage of the controller did not change, maybe because of some sort of protection. But i think i'm going to test this again!

 

[riba2233]

Wouldn't that destroy the insulation of the copper windings?

No, it is usually good for over 300 volts. All winding options use same type of wire and insulation.

The output voltage of the controller did not change, maybe because of some sort of protection. But i think i'm going to test this again!

Yeah, there must be reason for that, maybe the added voltage is too much for your controller. What battery do you have, and what controller exactly? What is nominal voltage for motor and controller (which option did you buy)?

 

[Hunne_128]

Yeah, there must be reason for that, maybe the added voltage is too much for your controller. What battery do you have, and what controller exactly? What is nominal voltage for motor and controller (which option did you buy)?

At the moment i have some "special for electric vehicles" 12V batteries for testing, later i planned to get some LiFePo4 akkus. I have the HPM-10KW (48V) and one VEC-500 (48V) inside the software you can turn the battery input voltage up to 70V, rated voltage is locked.

 

[riba2233]

Ok, so 72 nominal wouldn't work with this controller. You could try 60 V, but be sure that there's no setting in your controller software that limits motors rpm. That could be the reason for your problem.

 

[Hunne_128]

ok thanks, i will post the results soon

 

[nuxland]

Hey

VEC500 48V version has 75V mosfet-s inside, I have the same version and the same motor. So increasing your pack to 72V is not an option
In my case adding 4 cells to my 16 cell pack increased idle rpm from 4700 to 5500. 60V nominal is 69V fully charged.

 

[John in CR]

You increased the supply voltage by 12V and there was no increase in full throttle, no load speed of the motor?!

The output voltage of the controller did not change, maybe because of some sort of protection. But i think i'm going to test this again!

I don't know how you could measure output voltage of a brushless controller. If it's rated for 72V, then spin it up no-load and check the rpm. If there's a speed or rpm limit in the program list, then that's a place to start.

Brushless motors aren't limited in voltage directly. In your case the limitation is the physical construction's limit on rpm, and all the models should have the same limit. They're identical in terms of everything but the number of turns of copper, and the thickness of the copper, so in your case upping the voltage (as long as the controller can handle it) and decreasing the current limits should net virtually identical results as the faster per volt (higher Kv) motor that needs and can handle higher current for the same result.

 

[Hunne_128]

I just made some test and this are the results:

48V: 4241rpm
60,3V: 5285 rpm
72,3V 6003 rpm

Maybe i had some voltage limit configured before. And the max. voltage setting is 75 not 70
Now i just need to find a way to put 2 more batteries inside my vespa for some load testing.

 

[Dauntless]

Okay, he went to Goldenmotor and bought what HE thought would do the job. What would YOU have bought?

 

[nuxland]

I just made some test and this are the results:

48V: 4241rpm
60,3V: 5285 rpm
72,3V 6003 rpm

Maybe i had some voltage limit configured before. And the max. voltage setting is 75 not 70
Now i just need to find a way to put 2 more batteries inside my vespa for some load testing.

Keep us posted how VEC500 handles 72V nominal.
I myself are afraid to use 21S lifpo4 so I will upgrade my pack to 20S instead.