MCF8316AEVM: Increase torque on low speed

Hi Thilo,

Is this MCF8316C or MCF8316A?

I assume it should be MCF8316C on the EVM. I made some changes to slew rate  and startup.

If speed loop gain is sufficient device should apply torque appropriate,

One question, is this Speed PI is MPET tuned?

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Thanks and Best Regards

Venkatadri S

Hi,

yes it is a MCF8316C and I ran MPET before configuring the other settings.

Unfortunately nothing changes with these settings.

Thank you and best regards

Thilo

Hi Thilo,

We should characterize torque / speed under load for this.

Disable speed loop, run motor in torque mode and directly apply more than 50% torque command with full load condition.

Verify on same load condition to achieve required speed and record how much torque we need to apply.

Start with full torque and reduce until speed is settling to required value and with stability.

Please provide your observation to me.

Next, once we understand load torque requirement, we will adjust speed loop KP/KI, accel/decel parameters.

How is MPET verified for speed KP, KI? With load or no load?

Do you have power vs speed specification at loaded conditions? 

Thanks and Best Regards

Venkatadri S

Hi,

I need to start at 80% in torque mode resulting in a very high speed. I can then go down to a minimum of 67% before the pump stops turning and the speed is still above the speed mode minimum.

Venkatadri Shantaram84961 said:

How is MPET verified for speed KP, KI? With load or no load?

I run MPET without load, since it does not work with load

Venkatadri Shantaram84961 said:

Do you have power vs speed specification at loaded conditions? 

No.

Hi,

thank you. Changing all these parameters does not bring any real improvement. We will probably need a transmission to achieve lower speeds.

Best regards

Thilo