UM0971 datasheet(27/45 Pages) STMICROELECTRONICS

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UM0971

STEVAL-IHM0031V1 hardware settings

Doc ID 17701 Rev 1

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STEVAL-IHM0031V1 hardware settings

4.1

Settings for six-step current control (block commutation)

Six-step BLDC motor control requires one shunt resistor for sensing the motor current.

Moreover, for detecting rotor position, the user can choose between sensored or sensorless

techniques. In the first case, generally, Hall sensor signals are available from motor wires

and they must be connected to the J3 connector on the board.

Alternatively, sensorless rotor position detecting is performed by reading the back-EMF

voltage of the floating motor phase during running time.

The way this signal is processed depends on the sensorless technique the user wants to

implement.

In the following tables all the jumper configurations to drive BLDC motors in six-step

configuration are detailed.

Table 14.

Single-shunt current reading - jumper configuration

Jumper

Position / selection

J10

Not present

J11

Between 2 and 3

J12

Not present

J14

Not present

J15

Present

J16

Present

J17

Not present

Table 15.

Sensored mode - jumper configuration (Hall sensors for rotor position

detecting)

Jumper

Position / selection

Between 2 and 3

Table 16.

Sensorless mode - jumper configuration (BEMF reading w/o

amplification)

Jumper

Position / selection

Between 2 and 3

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