FULL BLDC SCHEMATIC
THE CONTOLLER IS AN INVERTER WITH PMOS AND NMOS POWER STAGE AND SELF MADE POWER MOSFET DRIVING CIRCUIT.THE SYSTEM IS CONTROLLED BY ATMEGA328P MICROCONTROLLER AND OPTO-ISOLATION PROVIDES PROTECTION.THE DRIVER STAGE CONSISTS OF FETS WHICH DRIVES 3 LEG INVERTER.PWM TECHNIQUE IS USED AT LOWER NMOS TO CONTROL SPEED OF MOTOR.CONTROLLER IS DESIGNED FOR DRIVING 1KW BLDC MOTORS.TO INCREASE CURRENT CAPACITY , 4 PARALLER MOSFETS ARE USED PER PHASE.
The fundamental frequency is 250Hz (see graph 5).
THE BELOW DESCRIPTION EXPLAINS THE COMPLETE CONTROLLER SCHEMATIC FOR REFERENCE AND BASIC FUNCTIONING OF CONTROLLER WITH SIGNALS MEASURED.
Code can be found at home page (bottom about me , project garuda report)
| NAME(refer schematic for nomenclature) | GRAPH |
|---|---|
| AH and BH Voltages | 1 |
| A PHASE(high rpm at AL,BL,CL) | 2 |
| A PHASE(low rpm at AL,BL,CL) | 3 |
| CURRENT BETWEEN AH AND G1 (POWER pmos gate) measured across 56 ohm | 4 |
| Frequency spectrum of Drain to Source voltage | 5 |
