AC Induction Application Notes Algorithm PIC16 Family PIC18 Family dsPIC® DSC 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). 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 Inverter VBUS Motor Mechanical Feedback – Op Amp – + VREF Comparator Recommended Products for AC Induction Motors Device Pins Flash KB SRAM Bytes EE Bytes Open Loop V/F Timer 8/16-bit Comp CCP/ ECCP Motor Control PWM A/D 10-bit Family Quad Enc UART SPI/ I2C™ 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.
EETE FEB 2014
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