All examples illustrate the unipolar motor effect: The magnet that generates the torque is firmly connected to the current-carrying conductor (Lorentz force).
These Unipolarmotor examples are also presentend on YouTube.
On these pages more detailed information is presented (current flow, torque / counter torque, assembly details) and additional pictures/videos and explanations.
Unipolarmotor 12 (the explanation)
Is coming up soon and will be the last video in this series
In this video, Farady’s paradox is illustrated and an attempt is made to explain it.
Unipolarmotor 11 (as linear motor)
Is coming up soon
The Unipolar motor can also be designed with a linear movement, a rotary movement is not necessary.
Unipolarmotor 10 (purely electrical)
In this example, a copper coil is used instead of permanent magnets to build an unipolar motor. The current flows from the axle to the coil and then through the coil. A thin iron ring is used inside the coil to enhance the effect.
The enameled copper wire with a diameter of 0.75 mm was wound twice in parallel (approx. 50 windings) to keep the electrical resistance low.
Starting current for the electric coil: 40A at 10V
Starting current for the counter example at the end of the video: 30A at 5V
Unipolarmotor 9
The current is supplied solely by a pair of copper discs. To reduce the friction caused by the weight the magnetic spindle is lifted by a small magnet mounted above the spindle.
Running up current: 20A (with 5V)
Unipolarmotor 8
This construction would allow several pairs of magnet discs to be connected electrically in series, so that a stronger effect could be achieved (similar to the number of windings in a conventional motor). Two design sketches are shown at the end of the video.
Running up current: 25A (with 5V)
Unipolarmotor 7
Both magnetic discs – electrically connected by a metallic band – rotate in the same direction. The deviation of the lower disc indicates the counter torque.
The counter-torque (actio=reactio) of the driving magnet disc is clearly visible. The rotation of the outer part is opposite to what the friction would cause (can distinctly be seen when the power supply is turned off and the friction starts to dominate).
Running up current: 40A (with 5V)
Unipolarmotor 6
Both magnetic discs – electrically connected by a metallic band – rotate in the same direction. The deviation of the lower disc indicates the counter torque.
Running up current: 30A (with 5V)
Unipolarmotor 5
Both magnetic discs – electrically connected by a metallic band – rotate in the same direction. The deviation of the lower disc indicates the counter torque.
Running up current: 30A (with 5V)
Unipolarmotor 4
An exciting question about Faraday’s Paradox is the balance of torque (actio = reaction). In this experiment all discs and electrical connections (band of copper) rotate in the same direction. The magnets are reversely oriented. The construction allows the axes to be turned independently of the discs. But I couldn’t detect a force.
To set the apparatus in motion: 10A (with 5V)
Unipolarmotor 3
The discs are connected through a ring (no sliding contacts). The current flows in one disc from the axis and in the other to the axis. The magnets are accordingly oriented to achieve rotations in the same direction.
Running up current: 8A (with 5V)
Unipolarmotor 2
The current is feeded on the axes so that no torque can take effect and flows only through the copper discs between the magnets (no electrical connection through the axes). The magnets are opposed (NS-SN).
Running up current: 50A (with 5V)
Unipolarmotor 1
This experiment demonstrates that no current from the axis to the rim is needed to produce a rotation. The current is feeded to the outer rim, over the contact bridges and back to the other contact.
There is no current through the axle. The magnets are opposed (NS-SN). The little magnet under the contact bridges serves to reduce friction losses (not necessary for the function).
Needed current: 40A (with 5V)
Subpages
- Unipolarmotor Example 10 Details
- Unipolarmotor Example 9 Details
- Unipolarmotor Example 8 Details
- Unipolarmotor Example 7 Details
- Unipolarmotor Example 6 Details
- Unipolarmotor Example 5 Details
- Unipolarmotor Example 4 Details
- Unipolarmotor Example 3 Details
- Unipolarmotor Example 2 Details
- Unipolarmotor Example 1 Details