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FOC Duty vs ERPM scaling ?

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Thu, 2019-09-05 09:40

#1

Azza

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Joined: 2019-08-27 12:54

Posts: 4

FOC Duty vs ERPM scaling ?

Hi All,

What determines the relationship between Duty (entered into the VESC Tool) and ERPM ? My problem is that the ERPM stops increasing at around 90% duty.

Even if I enter ERPM values greater than 17,000 the ERPM feedback doesn't go above 17,000.

I have configured a FlipSky FSESC 6.6 and 772KV 4 pole motor with the VESC Tool. I am running in FOC mode using a 13.8V power supply.

I am unable to achieve more than 17,000 ERPM where I was expecting up to 19,000 ERPM.

Thanks in advance for any suggestions

Azza

Fri, 2019-09-06 18:21

#2

Azza

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Last seen: 5 years 3 months ago

Joined: 2019-08-27 12:54

Posts: 4

OK to partially answer my own question.

The ERPM is proportional to the Supply Voltage and is also dragged down by the load. In my application the FlipSky will only run the motor at the same speed and load as different manufacturers controllers if the supply voltage is increased by 0.5 - 1.0V.

I don't know the root cause of this but I have exhausted all settings within the VESC Tool