UM0324 datasheet(73/105 Pages) STMICROELECTRONICS

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UM0324

Library functions

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ENC_GetPosition

ENC_Get_Electrical_Angle

ENC_Get_Mechanical_Angle

Synopsis

u32 ENC_GetPosition(void)

Description

This function returns the encoder timer value, giving a direct reading

of the rotor position from 0 to 4*(number of encoder pulses per

revolution). For the SHINANO motor included with the STR750-

MCKIT, the encoder delivers 400 pulses per revolution. This routine

returns: 0 for 0 degrees, 4*400/2=800 for 180 degrees.

Input

None

Output

Unsigned 32 bits

Functions called

None

See also

STR750 datasheet: synchronizable standard timer.

Synopsis

s16 ENC_Get_Electrical_Angle(void)

Description

This function returns the electrical angle in signed 16-bit format. This

routine returns: 0 for 0 degrees, -32768 (S16_MIN) for -180 degrees,

+32767 (S16_MAX) for +180 degrees.

Input

None

Output

Signed 16 bits

Functions called

None

Synopsis

s16 ENC_Get_Electrical_Angle(void)

Description

This function returns the mechanical angle in signed 16-bit format. This

routine returns: 0 for 0 degrees, -32768 (S16_MIN) for -180 degrees,

+32767 (S16_MAX) for +180 degrees.

Input

None

Output

Signed 16 bits

Functions called

None

Note

Link between Electrical/Mechanical frequency/RPM:

Electrical frequency = number of pair poles x mechanical frequency

RPM speed = 60 x Mechanical frequency (RPM: revolutions per minute)

Example: electrical frequency = 100 Hz, motor with 8 pair poles:

100Hz electrical <-> 100/8 =12.5Hz mechanical <-> 12.5 x 60=750

RPM

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