ST7MC1K2-Auto datasheet(180/371 Pages) STMICROELECTRONICS

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10.6

Motor controller (MTC)

10.6.1

Introduction

The ST7 motor controller (MTC) can be seen as a three-phase pulse width modulator

multiplexed on six output channels and a back electromotive force (BEMF) zero-crossing

detector for sensorless control of permanent magnet direct current (PM BLDC) brushless

motors.

The MTC is particularly suited to driving brushless motors (either induction or permanent

magnet types) and supports operating modes like:

●

Commutation step control with motor voltage regulation and current limitation

●

Commutation step control with motor current regulation, that is, direct torque control

●

Position sensor or sensorless motor phase commutation control (six-step mode)

●

BEMF zero-crossing detection with high sensitivity. The integrated phase voltage

comparator is directly referred to the full BEMF voltage without any attenuation. A

BEMF voltage down to 200mV can be detected, providing high noise immunity and

self-commutated operation in a large speed range.

●

Realtime motor winding demagnetization detection for fine-tuning the phase voltage

masking time to be applied before BEMF monitoring.

●

Automatic and programmable delay between BEMF zero-crossing detection and motor

phase commutation.

●

PWM generation for three-phase sinewave or three-channel independent PWM

signals.

Table 80.

MTC functional blocks

Section

Page

Input detection block

189

Input pins

189

Sensorless mode

192

D event detection

193

Z event detection

195

Demagnetization (D) event

197

Z event generation (BEMF zero crossing)

200

Protection for ZH event detection

201

Position sensor mode

202

Sampling block

203

Commutation noise filter

206

Speed sensor mode

208

Tachogenerator mode

209

Encoder mode

210

Summary

211

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