Datasheet

11
Motor Control and Drive Design Solutions
AC Induction Motors
AC Induction Motor Control
The AC Induction Motor (ACIM) is the workhorse of the
world. It is the most common motor type, used in everything
from consumer products to heavy industry. Its simple
design with no brushes makes it highly reliable and also
allows it to be manufactured at a low cost. But, it is less
efficient than other motors like PMSM, which is partially
related to the heat generation in the rotor windings.
The Open Loop Voltage/frequency (V/f) drive technique is
tradionally used to control ACIMs. It can be implemented on
an 8-bit PIC® MCU. This drive technique is not very efficient,
so for applications that need higher efficiency, an advanced
control solution like Field Oriented Control can be applied.
This requires a high performance controller, like a dsPIC
digital signal controller. Hardware and software development
solutions are available from Microchip.
AC Induction Motor Training
Class Title Language Recording Date Duration
Sensorless Field Oriented (FOC)
Control for AC Induction Motors
English 01/21/2008 23 min.
PIC
®
Microcontroller
or
Digital Signal
Controller
Gate Drivers
V
BUS
Inverter
Motor
Mechanical
Feedback
+
Op Amp
+
VREF
Comparator
Recommended Products for AC Induction Motors
Device Pins
Flash
KB
SRAM
Bytes
EE
Bytes
Timer
8/16-bit
Comp
CCP/
ECCP
Motor
Control PWM
A/D
10-bit
Quad
Enc
UART
SPI/
I
2
C™
PIC16F616/PIC16HV616
(1)
14 3.5 128 2/1 2 0/1 8 ch No
PIC16F684 14 3.5 128 256 2/1 2 0/1 8 ch No
PIC16F1509 20 14 512 2/1 2 4 12 ch 10-bit 1 1
PIC16F1783 28 7 512 256 4/1 3 2 11 ch 12-bit 1 1
PIC16F1823 14 3.5 128 256 2/1 2 0/1 8 1 1
PIC16F1933 28 7 256 256 4/1 2 2/3 11 1 1
PIC16F1936 28 14 512 256 4/1 2 2/3 11 1 1
PIC16F1937 40/44 14 512 256 4/1 2 2/3 14 1 1
PIC16F1939 40/44 28 1024 256 4/1 2 2/3 14 1 1
Note 1: HV device has on-chip shunt regulator.
AC Induction Application Notes
Algorithm
PIC16
Family
PIC18
Family
dsPIC® DSC
Family
Open Loop V/F
AN887
AN889
AN955
AN967
AN900
AN843
AN984
Closed Loop Vector Control AN980
Sensorless Dual-Shunt FOC with
PLL Estimator
AN1162
Sensorless Dual-Shunt FOC with
PLL Estimator and Field Weakening
AN1206
AC Induction Development Tools
dsPICDEM MCHV-2 Development System (DM330023-2)
This development system is intended for
high-voltage (up to 400V at 6.5A) BLDC,
PMSM and ACIM sensored or sensorless
applications. It provides a low-cost
Integrated Power Module (IPM) based
system for users to evaluate and develop applications
using dsPIC33F/E motor control DSCs via a Plug-In Module
(PIM) or a 28-pin SOIC socket. With the MCHV-2 either the
internal, on-chip op amps or the external op amps on the
MCHV-2 board can be used. Microchip provides PIMs for
using either the internal or external op amps. The MCHV-2
is fully backwards compatible with the original MCHV and
all MC PIMs. Isolated serial interfaces include RS-232C
and USB (for RTDM). Feedback support includes Hall-Effect
Sensors, Shaft Encoder, Back EMF voltages and single
or dual current shunt resistors. A PFC circuit is provided
to meet regulatory requirements. An isolated built-in
debugger (similar to a starter kit programmer/debugger)
permits a direct connection with a PC.
AC Induction Motor (AC300023)
This compact 3-phase AC Induction Motor
has been certified for use with dsPIC33
ACIM motor control application notes in
conjunction with the dsPICDEM MCHV-2
Development System (DM330023-2).