We have changed the rotor inside the TESUP Industrial Permanent Magnet Motor / Generator. It is now built from silicon steel laminations — thin sheets of electrical steel, insulated from one another and stacked, in place of solid metal. Our own measurements put the gain in power capacity at roughly 30 per cent. The frame is the same size, the shaft is the same shaft, and the machine bolts down exactly where the old one did. What changed is how much of the energy passing through it comes out as work instead of heat.
What you get out of it.
More power from the same box. That is the whole of it. If you are putting this motor behind a wind turbine, it will take a stronger gust before it runs out of headroom. If you are driving machinery with it, it will hold a heavier load without complaint. If you are building a conversion, you get more margin on the mounting plate you already drew up.
Nothing about the installation changes. Same mounting, same dimensions, same three-phase output, same wiring. If you have already specified this motor into a design, the upgraded rotor drops in without a redraw. Units shipping now carry it.
Why thin sheets beat a solid lump.
The magnetic field inside a motor does not sit still. It sweeps round as the machine turns, and any metal it passes through feels it change. A changing magnetic field inside a solid piece of steel does something unhelpful: it drives little circular currents in the steel itself. They are called eddy currents, and they do no useful work at all. They just warm the metal up. Every watt spent heating the rotor is a watt you paid for and never got back.
Slice that solid piece into thin sheets, coat each so it does not conduct into its neighbour, and stack them back into the same shape. The field passes through the stack much as before, because the sheets lie along the direction it wants to go. The circular currents cannot. Each one is now trapped inside a sheet a fraction of a millimetre thick, with nowhere to circulate, so it never builds. Adding silicon to the steel raises its electrical resistance and squeezes those currents down further again. It is why the transformer on your street is built from sheets, not cast in one piece.
Less wasted energy means less heat, and heat is the thing that sets the ceiling on any motor. A continuous rating is not really a statement about magnets or copper. It is a statement about how hot the machine is allowed to get before its insulation is at risk, and how fast it can shed that heat. Take a chunk of the waste heat out of the equation and the same frame, the same copper and the same magnets will carry more before they reach that limit. That is where the extra capacity comes from. Nothing was made bigger.
We did not add mass, magnets or copper. We stopped wasting what was already in there.
What we are and are not claiming.
The figure of roughly 30 per cent is ours. It comes from our own engineering team measuring our own machine, and we are publishing it as what we measured, not as a certified result from an outside laboratory. We are not quoting you an efficiency curve, a temperature rise or a new certification off the back of this change, because we have not published those and we are not going to invent them for a launch.
For the same reason, the rating on the product page is the number to go by. It is what we will stand behind if you ask us to size a system. If you want to know whether this motor suits what you are building, send us the load and the duty cycle rather than the headline. We will tell you plainly if it is the wrong machine for the job.
25 per cent off, today.
To mark the upgrade, the code TESUP25 takes 25 per cent off. Put the motor in your basket, open the basket, and type the code into the field marked Reseller code. That is where every discount code goes on our store, reseller or not. Everything we sell is included except the Magnum line. It ends today, 14 September. We are not telling you stock is about to run out, because it is not. The only thing that expires is the code.
THE UPGRADED MOTOR
TESUP Industrial Permanent Magnet Motor / Generator — now with the silicon steel laminated rotor. Current rating, price and full specification are on the product page.
Put it in your basket and enter TESUP25 in the Reseller code field for 25 per cent off.
The figure of roughly 30 per cent more power capacity is TESUP’s own measured improvement, produced by our engineering team on our own machine, and is not an independently certified test result. The continuous and peak ratings, the price and the full specification of the motor are on its product page and are the figures to design and order against. The discount code TESUP25 gives 25 per cent off at checkout on TESUP stores and is valid today only, 14 September 2026.