Microchip Technology AC300024 数据表

 www.microchip.com/motor 

 

Let Microchip show you how to save energy, reduce 
noise and cost, improve torque response and reliability. 

Are you looking for top of the line dynamic torque 
response and effi ciency, and the lowest system cost 
motor control solution? Take a look at Microchip’s 
dsPIC sensorless Field Oriented Control (FOC) AN1078 
(PMSM) and AN1162 (ACIM) application notes. The 
dsPIC DSC provides a very cost effective solution to this 
complex algorithm.

The dsPIC DSC’s 10-bit A/D module samples the motor 
voltage and currents. Clarke and Park transformations 
transform the A/D information to feed two PI loops 
controlling torque and fl ux. Motor speed and position 
are determined by an estimator which models the motor. 
The outputs of the PI loops are transformed using 
Space Vector Modulation to control the Motor Control 
PWM Module’s PWM outputs. Sinusoidal (180º) outputs 
provide smoother, quieter motor operation.

Want to eliminate your Hall-Effect sensors and cabling 
cost by going sensorless? Take a look at Microchip’s 
PIC18F MCU or dsPIC DSC sensorless BLDC solutions. 
Application notes AN970/AN991/AN992 (Sensorless 
BEMF), AN1083 (Sensorless Filtered BEMF) and 
AN1160 (Sensorless Filtered BEMF with Majority Detect) 
provide details. FIR Filtering of the BEMF and/or using 
Majority Detect can help with high-speed motors or 
motors with distorted BEMF signals.

The PIC18 MCU’s or dsPIC DSC’s A/D samples the 
motor phase voltages. From the voltages, the CPU 
determines the rotor position and drives the motor 
control PWM module to generate trapezoidal output 
signals for the 3-phase inverter circuit.

Need a highly integrated fan controller with a 
customizable speed/temperature profi le? Take a look at 
Microchip’s PIC12HV and PIC16HV devices.

The PIC12HV and PIC16HV devices have a built-in 5V 
regulator and on-chip comparator to save system cost. 
The rotor position is determined by a Hall-Effect sensor 
connected to the on-chip comparator. The Enhanced 
Capture Compare PWM (ECCP) Module uses this 
feedback information to drive the motor by steering 
the PWM signal to the appropriate motor phase. 
Temperature sensor inputs can be used to create a 
unique fan speed profi le and the application can provide 
digital status information to a host device.

PI

Σ

 

θ

 

PI

PI

-

N 

REF

I

Q

 

REF

I

D

 

REF

Σ

-

V

Q

V

D

I

Q

I

D

V

α

V

β

SVM

I

α

I

β

D

,

Q

α,β

Position

Speed

Σ

-

A

,

B

,

C

α,β

V

α

V

β

Motor

3 Phase

Bridge

Ia

Ib

Position and

Speed

Estimator

D

,

Q

α,β

3-ph

Inverter

IBUS

BLDC

Demand

Fault

VDC

Phase Terminal Voltage Feedback

PWM3H

PWM3L

PWM2H

PWM2L

PWM1H

PWM1L

FLTA

AN0
AN1
AN2

AN12

AN13

AN14

N

S

Hall Sensor

12V DC

A

B

Temperature

PWM Command

I

2

C™

Commutation

& Speed