Switched Reluctance Motor Part 1
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- Опубліковано 14 сер 2012
- This is an experimental switched reluctance motor which uses only external electromagnets in the stator, and no windings or permanent magnets in the rotor. Thus it is a very simple, rugged, and low cost design. The expense and complexity may be in the controller. The principle is essentially using electromagnets to align a piece of steel and then switching the excitation to adjacent magnets to achieve motion. I think I need to work on the design of the rotor and the pole pieces so that the force aligns the rotor at an exact point of rotation, which means wider stator pole pieces or more narrow rotor tips.
- Наука та технологія
When you find a low resolution video from 10 years ago, you know you've found pure gold.
this is so practicle example for reluctance motor. thank you.
I am surprised more peeps haven't done projects like this
Hi, great prototype and development, I know this video is old have you built another revision of this? I would be very interested to see if you were able to increase efficiency and output on a second version, thanks for sharing
Using diodes the reverse pulse increased input voltage continuously, progressively and there was a significant gain in speed using 1 amp. It had to be stopped because it was running from a power supply. The arrangement was single phase with four series coils and 8 weak magnets that were the same dia. as the coil iron. The controller used optical positioning and was very precise. The next step was to make it three phase. The device has no practical use but is a test bed for more efficiency.
Another consideration is that there is only rotational force when the coils are out of alignment with the magnets. When they cover the poles completely a strong field does nothing. One way is to make an 8 pole 5 coils that pulse one after the other storing the reverse charge for the next coil. Whether or not this could be made into alternate north south poles I can't remember. The back voltage from the collapsing field could be stored for the next coil with diodes for a top up from low voltage.
How excited for Turntide are you!!!!!!!!!
You need a Hall effect sensor. It needs to know how fast to change poles so you are not pulling momentum out a moment after its applied.
hall sensor will let SRM positives be gone because one of them is stability. For example Brussless motor with magnet will be effected when temperature of env is too hot, hall sensor is same as..
This is a very nice demonstration. You may want to play with the shape of the rotor to make it self starting. There is no reason why it should not be self starting.
Would be real interesting to put the green magnetic feild paper on this while stop and having a pulse to show the feild lines
my guess is the edge of the rotor is too thin and to a lesser extent too wide if that makes sense.
Paul: Can I get a list of materials and a diagram of your work. I am just getting started with reluctance motors and I no nothing about them.
Thanks David
In a BLDC the magnets are close together and I think this is inefficient. If the field aligns there is an inrush current and if opposed a large voltage is required to overcome back emf requiring less turns. Another consideration is once energized the magnetic drag will continue on the rotor for a fraction. I built one with double wound coils and a separate double wound inductor to reverse the current in one winding like a transformer to drive down the magnetism and reverse it to repel slightly.
I know this is an old video, so perhaps this is invalid now, but if you were to start the motor with a low stator frequency and gradually increase it to your running speed you could start the motor without it needing a push start
This looks very cool, partly because it looks very dangerous.
design detail like Wire guage,volt,current bobbine size connection?
What kind of coils u used on that prototype?
They are 24 VDC coils removed from 30A DPDT relays.
What is the material you have used for rotor ?
The rotor is just a galvanized steel cover plate for an electrical box.
can you give the program code?
There is no outer ring to complete the magnetic circuit?
The coils have a steel core and a metal angle bracket that screws onto the steel box, so that forms somewhat of a magnetic circuit. But it's not really needed. An energized solenoid will still attract the steel poles of the rotor.
why sparking light are coming alternatively
The LEDs indicate the polarity of the solenoid drive. They are red in one direction and green in the other. When driven fast enough, they appear yellow. This design is somewhat different from other SRMs that use just one polarity either ON or OFF. I may revisit this project and try some new ideas.