![magnetic gyroscope magnetic gyroscope](https://www.supramagnets.com/store/1284-medium_default/kids-magnetic-spinning-top-levitation-magic-gyro-gyroscope-suspended-ufo-floating-levitating-classic-toy.jpg)
In order to spin the motor, current has to run through the drive coil and generate a magnetic field when it would push the rotor in the correct direction.
![magnetic gyroscope magnetic gyroscope](https://i5.walmartimages.com/asr/125d83c0-0b9d-4953-b93d-ca2305cf828f.5f48cf39d6bd9a37a82c427fece4e784.jpeg)
There are 4 main components to the electronic system of the motor: Ultimately, the wound coil with 30AWG wire ends up with about a resistance of 1.4 ohms. The inner diameter of the coil is 0.2 inches, and the outer diameter is about 0.5 inches, which was a diameter that fit the design of the frame in an orientation that coupled with magnetic fields of the rotor. The coil is wound from the 30AWG wire in an effort to get as much linear length (and from that resistance) as possible for an given volume.
![magnetic gyroscope magnetic gyroscope](https://cdn.globalso.com/optoedumicroscope/2469193113797632202001dd25ca09d13cf9cf12902f41d45ae5d1.jpg)
Spinning rapidly with these uneven magnetic forces causes vibration and energy loss, which would interfered this the smooth coasting of the rotor. Having a piece of steel close to the magnets would have caused cogging when the magnets got close to the steel and did not want to move away. Because the gyroscope motor is meant to coast freely, the coil was wound around nonferrous core. Most coils are wound around a ferrous core, which provides helps direct and focus the magnetic fields generated by the coil. The magnet wire can be found on Sparkfun in a bundle of 3 different gauges, 22, 26 and 30 AWG: The stator coil is hand wound from magnet wire. The Fusion360 sketch attached is a parametric CAD file for designing the laser cut part and properly generating vectors to laser cut. I also pressed a skateboard bearing into that center of the prototype rotor to allow it to spin freely without friction. With the dimensions set, I laser cut the design from a piece of scrap, and press the magnets in to the outside of the rotor. 0.020 inches between magnets is enough to guarantee that the inside and outside of the rotor are well attached to each other, and that the magnets aren't too far apart. Permanent magnets in a motor need to alternate the pole that is facing towards the drive coil, which means that there must be an even number of magnets to insure there are not any magnets of the same orientation next to each other.īy choosing a gap between magnets, and a number of magnets, I set the diameter of the rotor. It is sensored because it needs active sensors to control the drive coil, single phase because there is only one drive coil, brushless because there are no mechanical switches controlling the direction of current through the coil, and uses rare earth magnets to provide magnetic fields embedded in the rotor of the gyroscope. The motor I designed is a sensored single phase permanent magnet brushless motor. Before moving on to machining more expensive brass, the geometry and drive circuitry needs to be verified. The first part to fabricate and test is the rotor of the gyroscope.