Recent content by learningrc

Probably means PM assisted synchronous reluctance (not switched reluctance).

"Angled laminations" are usually called "skew." The stator or the rotor can be skewed. The main reason this is usually done is to reduce cogging torque. It has no effect on direction of rotation.

Not sure why he uses force instead of torque but it doesn't really matter for the point he is making. The 2 force vs angle graphs are a bit different than the standard ones you generally see in the literature but the bottom graph is force vs current vector phase angle with respect to the d-axis...

nutspecial, The physical law it is breaking is the conservation of energy. You can't get more energy out of a system than you put into a system. In the first video you posted, notice that every one of those parts of the video where motion is produced, a human is in some way providing energy...

I suppose if you started physically moving the magnets while it rotated, it could work. But then you are adding energy into the system, which defeats the supposed point of the magnet motor. What advantage do you think doing it this way would have over normal motors?

Magnet motors are literally impossible. If you had a motor that had permanent magnets on the rotor and the stator, then the most the rotor will turn is 1/2 revolution. It will turn until the magnets are in a state of equilibrium. Actual motors work because at least on of the magnetic...

Typical software used in industry would be MotorSolve, Speed, RMExpert, JMAG-Express, and YES motor design software. There are others, but those are the main ones I've seen. A lot companies develop their own software. And, of course, in addition to this motor design software, most companies...

If you pair an ideal motor with trapezoidal back-emf with an ideal trap drive and do the math, you can see that the harmonics in the back-emf and the harmonics in the current actually work together to produce torque, not losses. In fact, if you compare an ideal trap motor+drive to an ideal sin...

Well, it depends what you are trying to do but generally you will group the entire rotor into one group. Then you can select the group and then go up to "Rotate" under the Edit menu. The angle you need to rotate it for each step is going to depend on a number of things (number of poles, number...

An active research topic in academia is the design variable flux-intensifying machines. See this abstract, for example. These are IPM machines that use magnets with low coercivity so they can be more easily demagnetized and remagnetized. I spoke with a professor at the U of Wisconsin...

For those in the Chicago area,the Coil Winding show is coming up soon (Oct. 4-6) and you can get tickets for free. Besides seeing a whole bunch of cool technology used to manufacture motors, you can also attend talks by Konstantinos Laskaris (Principle Motor Designer at Tesla), Jim Hendershot...

It isn't quite right to say that the only thing that causes torque is amps. Torque (in PM motors) is caused by the interaction of the permanent magnet flux with the flux caused by the current flowing in the coils. So torque is proportional to 1) the current, 2) the air gap flux (per magnet...

That lecture is by Dave Wilson at TI. For a more in depth look from Dave, look up "Teaching Old Motors New Tricks" on youtube. It is a set of 5 lectures that really goes into detail. It has some of the same material as this one.

I talked to these guys at a conference a couple years ago. That had a lot of different magnets to play with at their booth. I asked if they had any ideas about how these would be used with motors and they didn't give me much of an answer. At the time, they were somewhat limited on the grade...

Electric Machine Design Videos by Jim Hendershot. http://www.motor-engineer.net/engineering-center/learn/tutorial-electric-machine-design-hendershot/ I've taken a course with Jim and see him at conferences every once in a while. He's a great guy and these lectures are a very valuable resource