UM-YROTATE-IT-RX62T datasheet(47/54 Pages) RENESAS

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RX62T

YROTATE-IT-RX62T Motor Control Kit

UM-YROTATE-IT-RX62T Rev.1.00

Page 47 of 51

Jan 15, 2014

21. List of variables used in the file name: “motorcontrol.c”

The file called “motorcontrol.c” includes the motor control algorithm routines. Please find below the description of

the variables used in this file.

Label(s)

Type

Description

Unit

ium_off, ivm_off,

iwm_off

float

A/D conversion offsets of measured u, v, w phase currents; the

value is around 2048, that corresponds to one half of the A/D

converter supply voltage (5Vdc) (12bit A/D).

vol_ref

float

A/D conversion result of the reading of the reference voltage

(4.25V); used for compensate the effects of the power supply

variations in the A/D conversions; the ideal value is 870 (10bit

A/D), if the A/D converter supply voltage is exactly 5V.

kadi, kadv

float

Current and voltage conversion constants; they are corrected

on the grounds of vol_ref, and they are used to convert the A/D

results in the used measurement units; multiplying the A/D

result by the conversion constant, the current (voltage) in

Ampere (Volt) is obtained (ex.: iu=kadi*(iuad-ium_off))

r_sta

float

Stator resistance

ohm

l_sync

float

Synchronous inductance

henry

c_poli

float

Number of polar couples

krpmocp,

ukrpmocp

float

Conversion constant between mechanical speed and electrical

speed, and its reciprocal (ukrpmocp=1/krpmocp).

(rad/s)/rpm,

rpm/(rad/s)

vstart

float

Startup voltage in single shunt operation; during startup, first a

voltage ramp at zero speed is performed, then a voltage and

speed ramp; vstart is the actual value.

volt

vs_off

float

Offset startup voltage in single shunt operation; vs_off is the

total starting value (total voltage at zero speed).

volt

vs_inc

float

It is the quantity added at every zero speed ramp step to obtain

vs_off.

volt

vs_del

float

Total voltage quantity added during startup in single shunt

operation; added to vs_off, it gives the voltage applied when

the voltage and speed ramp is finished.

volt

vs_dela

float

Voltage quantity added at every voltage and speed ramp step

during startup in single shunt operation.

volt

istart

float

Startup current in three shunts operation; during startup, first a

current ramp at zero speed is imposed, then a speed ramp with

constant current (istart).

ampere

is_inc

float

Startup current increment at every step.

ampere

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