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无刷直流电机控制 AN857

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无刷直流电机控制 AN857

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无刷直流电机控制_AN857.pdf 403K

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AN857  
Brushless DC Motor Control Made Easy  
可以移植到更小更便宜的PIC控制器里  
ment. The final code can then be ported to one of the  
smaller, less expensive, PIC microcontrollers. The  
porting takes minimal effort because the instruction set  
Author:  
Ward Brown  
Microchip Technology Inc.  
指令  
is identical for all PIC 14-bit core devices.  
完全相同的  
INTRODUCTION  
It should also be noted that the code was bench tested  
This application note discusses the steps of developing  
several controllers for brushless motors. We cover sen-  
sored, sensorless, open-loop, and closed-loop design.  
There is even a controller with independent voltage and  
speed controls so you can discover your motor’s char-  
and optimized for a Pittman N2311A011 brushless DC  
motor. Other motors were also tested to assure that the  
code was generally useful.  
Anatomy of a BLDC  
插图  
实证  
acteristics empirically.  
Figure 1 is a simplified illustration of BLDC motor con-  
struction. A brushless motor is constructed with a per-  
manent magnet rotor and wire wound stator poles.  
Electrical energy is converted to mechanical energy by  
the magnetic attractive forces between the permanent  
magnet rotor and a rotating magnetic field induced in  
the wound stator poles.  
The code in this application note was developed with  
the Microchip PIC16F877 PIC® microcontroller, in con-  
jucntion with the In-Circuit Debugger (ICD). This com-  
bination was chosen because the ICD is inexpensive,廉价的  
and code can be debugged in the prototype hardware  
without need for an extra programmer or emulator. As  
the design develops, we program the target device and  
exercise the code directly from the MPLAB® environ-  
FIGURE 1:  
SIMPLIFIED BLDC MOTOR DIAGRAMS  
100  
N
A
A
com  
a
c
S
110  
101  
N
N
a
com  
b
6
4
3
b
1
C
N
com  
S
S
001  
010  
c
N
a
B
c
b
com  
C
S
B
011  
2002-2011 Microchip Technology Inc.  
DS00857B-page 1  

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