TMS320F28069M: about unit of I_A_offset value

Sh.Sasaki

Guru 13625 points

Part Number: TMS320F28069M
Other Parts Discussed in Thread: MOTORWARE

Hi all,

I'd like to know unit of I_A_offset value.

This value is defined in user.h.

Is this value's unit [pu] or [A]?

I didn't know that I checked the manual and the source code.

My software : motorware_1_01_00_17, lab5b

Best regards,

Sasaki

over 8 years ago

0 Yanming Luo over 8 years ago

TI__Guru** 116110 points

It's a pu value, is near the 0.5*USER_ADC_FULL_SCALE_CURRENT_A/USER_IQ_FULL_SCALE_CURRENT_A with a sign which depend the amplify circuit.

0 Sh.Sasaki over 8 years ago in reply to Yanming Luo

Guru 13625 points

Hi,

Thank you for your support.
I understood it.

Best regards,
Sasaki

0 Sh.Sasaki over 8 years ago in reply to Yanming Luo

Guru 13625 points

Hi yanming-san,

By the way, if the value is Pu,
These values( I_A_offset & V_A_offset) are "1" if there is no offset with ideal sensor feedback. Is this correct?

Best regards,
Sasaki

0 Yanming Luo over 8 years ago in reply to Sh.Sasaki

TI__Guru** 116110 points

It's _IQ(0.5) for ideal sensor back if the voltage offset is 1.65V for current sample circuit.
It's _IQ(0.0) for ideal voltage sensing.

0 Sh.Sasaki over 8 years ago in reply to Yanming Luo

Guru 13625 points

Yanming-san,

Thank you for your support.

Best regards,

Sasaki

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TMS320F28069M: about unit of I_A_offset value