electric motor + stepper motor
Channel: HomoFaciens
Date: 2011-02-02

Table of content:
00:11 Stepper motor
01:27 Shortening the turn-on time
02:16 Enabling inductors simultaneously
03:19 Altering the direction of rotation
04:29 Software modes stepper motor
06:37 Rotation by repelling forces
09:04 Sensor disc
09:29 Electronic commutation
11:07 Brake pedal
11:31 Automatic speed control
12:33 Revolution counter
14:59 Electric input power
17:33 Losses at the power transistors (temperature)
18:28 Mechanical output power (efficiency)
19:28 Software modes commutated motor
22:48 Oscillograph turn-on times

The functionality of an electric motor is treated at this video. The motor is converted from a stepper motor into an electronically commutated motor in progress of the film.
In addition, the efficiency of the motor is determined. To do so, the electric input power and the mechanical output power are measured.
The used materials of the electric motor are as simple as possible to be able to do a reverse engeneering.
The functionality is demonstrated by using a self-made revolution counter, digital multimeter, LEDs and an oscilloscope.
An ATmega8A microcontroller is used to control the motor by software.
This little electric motor is a test model of an electric vehicle, which is built as an open source project by now.