Roland Buchi

Brushless Motors and Controllers Roland Buchi

In recent years, brushless DC motors and controllers have begun an unparalleled triumph in model construction and in all technical fields. This book is intended to show how a brushless motor works. The basic principle is discussed first, before all the key terms such as kV and rpm/V, operating voltage, load and idle current, torque, turns, electrical and mechanical power, losses, efficiency, etc. are explained. A brushless motor can't work without a brushless controller, it requires a three-phase AC voltage. To increase the speed properly, the controller must have information on the rotor position. This can be done by Hall sensors or directly via the motor windings. All that will be taken into account in the book.
            
Contents:
1. Introduction
1.1 Electro-mechanical energy converter
1.2 Differences between brushed and brushless motor
1.3 No brushless motor without brushless DC controller
1.4 Brushless DC motor or just brushless motor?

2. Working principle of the brushless motor
2.1 Active principle
2.2 Action of force on a current-carrying conductor in a magnetic field
2.3 Force action in practice on the example of an inrunner
2.4 More stator slots and magnetic poles on the examples of outrunners 6S8P and 12S14P
2.5 Star connection, delta connection
2.6 Findings in brief

3. Characteristics of the brushless motor
3.1 kV, rpm/V
3.2 Winding resistor
3.3 Motor characteristics
3.4 Turns
3.5 Motor power
3.6 Braking operation
3.7 Efficiency
3.8 Findings in brief

4. Brushless DC Controllers
4.1 Power stage
4.2 Timing and phase measurement
4.3 Maximum current, current and temperature measurement
4.4 BEC voltage
4.5 Low voltage measurement
4.6 Operation modes
4.7 Microcontroller and setting the parameters
4.8 Findings in brief

5. Practical examples
5.1 Practical tips for cabling
5.2 Graupner Compact drive
5.3 Modification of a monster truck to a brushless motor

6. Sources of error
6.1 Short to frame, short circuited coil, short circuit
6.2 Bearing and shaft
6.3 Defective power stage of the controller