ST7FMC2N6B6(2004) 데이터 시트보기 (PDF) - STMicroelectronics

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ST7FMC2N6B6
(Rev.:2004)

8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, BRUSHLESS MOTOR CONTROL, FIVE TIMERS, SPI, LINSCI™

STMicroelectronics 

ST7MC1/ST7MC2

MOTOR CONTROLLER (Cont’d)

Figure 72. Example of Command Sequence for 6-step Mode (typical 3-phase PM BLDC Motor

Control)

Step

Σ1 Σ2 Σ3 Σ4 Σ5 Σ6 Σ1 Σ2 Σ3

HV

Switch

0

T0

T2

T4

1

B

I1

I6

2

I4

3

I3

4

5

Node

HV

A HV/2

0

HV

B

HV/2

0

HV

HV/2

C0

A

I5

T1

T3

I2

C

T5

Note: Control & sampling PWM influence is not represented on these simplified chronograms.

Σ1

Σ2

Σ3

Σ4

Σ5

Σ6

HV

C2

C4

D2

HV/2

Superimposed voltage

(BEMF induced by rotor)

- approx. HV/2 (PWM on)

- approx. 0V (PWM off)

0V

Z2

Demagnetization

Commutation delay

Wait for BEMF = 0

D5 Z5

t

PWM off pulses

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