SEMA CX-170 Motor Performing Servo Moves.
SEMA E813 Motor/Generator Demonstration of Zero Cogging Torque
Note that the speaker misspeaks when he says that a SEMA motor or generator has "practically" zero cogging torque. The simple fact is that it has zero cogging torque. The only thing that keeps the motor/generator turning after the initial effort is the inertia of the rotor, and there is neither cogging nor iron losses to slow it down. This video helps to demonstrate how the E813 achieves proven efficiencies of greater than 98 percent.
SEMA EMA Performing TVC Sequence
This is a SEMA linear electromagnetic actuator (EMA) performing a simulated thrust vector control sequence. The targeted application is the Crew Launch Vehicle (CLV) upper stage J-2X engine. The pan to the right shows the motor hardware and the actuator mechanisms. The initial moves are small and not very noticeable, but later in the video the moves really step up. The steady noise you hear is the fan on the monster DC power supply that is powering the actuator. This system is now NASA property.
4-Slice 2s-158-6 Motor on Dynamometer
This is a 4-slice 2s-158-6-56.3 SEMA motor on KAT's Magtrol dynamometer. This aerospace application demonstration demonstrated the redundancy advantages of a SEMA motor. Most of the noise is actually coming from the blower on the dynamometer.
Here is a video showing the extensive data logging capabilities of the Magtrol dynamometer.
Kinetic Art & Technology is now offering motor and generator test services utilizing this powerful dynamometer.
Motor Portion of NASA EMA
This is an interesting video to compare with the linear EMA video. This video shows the rotary motion that produces the large sweeps in the TVC sequence in the other video. This is prior to locking the shaft to produce the linear motion, so what you see is the rotary motion required to produce the linear motion. The background noise, as in the linear EMA video, is from the monster DC power supply powering the motor. This was shot during development on the NASA project. Were it to be redone, visual indicators would be placed on the shaft to make it easier to see the rotary motion. However, since this hardware is now NASA property, the opportunity to reshoot this sequence is past.