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MCF8315A: MPET_IPD_FAULT

Annie Liu
Genius 10295 points
Part Number: MCF8315A

Hi Team,

During the development process, the motor kept popping up messages:

 [ MPET_IPD_FAULT->Indicates error during resistance and inductance measurement.

Details are as follows:

According to the guide, even if MPET_IPD_CURRENT_LIMIT is adjusted, it won't work.

What the customer drives is this small motor (the motor used in handheld three-axis stabilizers). The resistance is 2.3R. According to the manual, just divide by 2 and it should be a 1.15R resistor. Since there are no tools, the customer cannot measure and know the inductance parameters. Various parameters cannot be measured using the MPET that comes with the chip. Every IPD session stopped with a tremor. The customer wants to know how to use MPET to test such a small motor if there is no inductance meter?

MPET will be wrong every time. Are there any empirical values for this small motor? The customer does not have a TI 430EVM, he uses an STM32 microcontroller.

This is the signal from phase A.

Regards,

Annie

  • 0
    TI__Genius 9220 points

    Hi Annie,

    Could you please ask the customer to check what [MPET_IPD_SELECT] is set to?

    If [MPET_IPD_SELECT] = 0b, the IPD current limit and the repeat number is configured using [IPD_CURR_THR] and [IPD_REPEAT].

    If [MPET_IPD_SELECT] = 1b, the IPD current limit is configured using [MPET_IPD_CURRENT_LIMIT] and the IPD repeat number is configured using [MPET_IPD_FREQ].

    Regards,
    Eric C.