TMS320F28379D: BEMF constant in mV/Hz Clarification

Steven zhu

Tool/software:

In the formula below, could you clarify whether the "BEMF constant in mV/Hz" refers to the phase-to-phase peak or the phase-to-neutral peak

over 2 years ago

0 Allison Nguyen over 2 years ago

TI__Mastermind 27510 points

Hello,

Could you please clarify which document/chapter this formula can be found so I can direct this question to the correct expert?

Best Regards,

Allison

0 Steven zhu over 2 years ago in reply to Allison Nguyen

Prodigy 60 points

Refer to the link below

e2e.ti.com/.../mcf8315a-speed-control-issue

0 Steven zhu over 2 years ago in reply to Steven zhu

Prodigy 60 points

or can help to calculate the BEMF constant if:

1 measured phase to phase rms voltage is 10v/Krpm

2. Motor is 4 pole pairs

So how to calculate BEMF constant in mV/Hz?

0 Joshua Horlander Cruz over 2 years ago in reply to Steven zhu

TI__Mastermind 35730 points

Hello Steven,

Steven zhu said:
In the formula below, could you clarify whether the "BEMF constant in mV/Hz" refers to the phase-to-phase peak or the phase-to-neutral peak

The equation you provided refers to a phase to neutral BEMF constant.

Steven zhu said:
So how to calculate BEMF constant in mV/Hz?

Please refer to the calculation explication in the following e2e thread: https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1397018/mcf8315a-unit-clarification-of-the-back-emf-constant-used-in-the-formula

Regards,

Joshua

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TMS320F28379D: BEMF constant in mV/Hz Clarification