What type of throttle mode does this controller use?

[fb9]

Hi everyone,
I'm an engineering student and, for my thesis, I need to use an e-bike motor and controller to power a small vehicle.

The problem is that I have this controller, a KT24ZWSR-YY02D, and I need to know which throttle mode it uses.
On a thread I found on the forum, I learned that the main modes are: open-loop PWM, closed-loop speed mode, closed-loop current/torque mode and power mode. But I couldn't find information on my controller on such thread.

I also tried to mail the producer (I think it's Kunteng) that basically ignored my request for information. So I tried to call them, but they said they don't have a datasheet for such component and that they "can't talk about their technology with customers" (that sounds strange, since I asked only how I can use their product...).

I really don't know where to look for further information.
I'm asking you because I see you have a lot of experience on the field.

Thank you for your time

 

[amberwolf]

Almost certainly it is a "speed throttle", meaning open-loop pwm.

But you can find out what kind of mode it uses by actually *using* it, easily enough. If it varies the speed of the motor on a "test stand", then it's a speed throttle.

If it goes full speed even with low throttle input, then it's a current or torque throttle.

 

[fb9]

Almost certainly it is a "speed throttle", meaning open-loop pwm.

But you can find out what kind of mode it uses by actually *using* it, easily enough. If it varies the speed of the motor on a "test stand", then it's a speed throttle.

If it goes full speed even with low throttle input, then it's a current or torque throttle.

Thank you amberwolf

So, am I right if I say that all that this controller does is putting a PWM voltage, that is linearly proportional to my input, in the right sequence, on the windings?

Can I say that there is no closed loop control on current or speed inside the device?

I tried to use it, but unfortunately the vehicle we are working on isn't ready yet. So I could only test it on a wheel without load.

I think I can exclude that it is current/torque closed loop, since when I try to stop the wheel while it's spinning, I see from the power supply that there are current peaks.

So I'm in doubt between open-loop and closed speed-loop...

 

[fechter]

If it was closed loop current control (which I prefer), when you give a small throttle input, the speed would go to maximum with no load on the motor. With open loop speed command, the motor RPM will be fairly linear with throttle input.

 

[fb9]

If it was closed loop current control (which I prefer), when you give a small throttle input, the speed would go to maximum with no load on the motor. With open loop speed command, the motor RPM will be fairly linear with throttle input.

Ok, perfect. Thank you for your answer

For my needs it's better to have a controller that is open-loop. I mean, something that does only the basic things (power the correct windings at a voltage proportional to the signal I give it).

The reason is that I need to design the feedback control system by my own, and a basic driver gives me more freedom.