s12ZVM single resistor

zhouqicheng — Tue, 27 Jun 2023 06:30:51 GMT

Hello, the code in the official program of s12ZVM single resistor

#Define I_ PH_ Over FRAC16 (0.933333333333)

#Define TEMP_ Over FRAC16 (0.170489770614)

What does this current and temperature actually represent? How to convert? Do you have any relevant program introduction documents

Re: s12ZVM single resistor

tomasfedor — Tue, 27 Jun 2023 09:36:55 GMT

Hi Zhouqicheng,

In order to explain it I will use files form S12ZVM PMSM Development Kit sw

I_PH_OVER and TEMP_OVER are located in PMSM_appconfig.h generated by MCAT tool.

MTRCKTSPNZVM128\sw\AN5327_SW_CW10\FreeMASTER_control\AN5327_PMSM_FOC_Sensorless_SingleShunt.pmp

Values are scaled in FRAC16 format since fraction arithmetic is used.

in case of S12ZVM PMSM Development Kit sw:

#define I_PH_OVER FRAC16(0.4650000000)
#define TEMP_OVER FRAC16(0.1704897706)

in order to get physical value we need to apply scales

I_PH_OVER * I max = 0.465 * 20 = 9.3A

TEMP_OVER* Temp max = 0.1704897706 * 645.2 = 110 deg C

for more information I recommend application note AN5327.

Best regards,

Tomas Fedor.