Toroidal transformers, design and production of power transformers, autotransformers and chokes on ring-type magnetic circuit

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Toroidal Magnetic Circuit


In order to create a closed loop the Company developed production of its own toroidal magnetic circuits (core rings). Available equipment makes it possible to work with any kind of electric steel with thickness of 0.08 to 0.5 mm.

URS-1 Steel cutting machine provides the following strip thickness, mm: 8, 14, 16, 20, 22, 23, 25, 30, 32, 35, 40, 45, 50, 55, 70, 90.

This strip thickness range, availability of finished arbors and maximum outer diameter of mechanical winding equal to 380 mm makes it possible to optimize mass-dimensions of magnetic circuits (cores) for specific item. Besides, coiled cores undergo turning machining for chamfering of internal and outer bevels. This stage allows:

  • to decrease bending stress of enameled wire during magnetic circuit coiling, that in turn reduces the risk of winding damage (it is especially topical during accurate mechanical wire laying with big tension);
  • to decrease coil turn length and consequently coils wire consumption;
  • to minimize barrel shape of finished transformer.

Heat treatment of magnetic circuits is performed in shaft furnaces. Shaft furnaces in comparison with tunnel furnaces provide more controlled annealing process and more stable magnetic permeability indicators of finished products. Minimal induction of annealed cores is 15500 Gs.

Size of the toroidal magnetic core (toroid)

Example of reference designation: OL 40/64-25, where inner diameter (d) = 40 mm, outer diameter (D) = 64 mm, height (h) = 25 mm. A range of standard dimension types of magnetic circuits made of electric steel, more often used in manufacturing, is given below.

Magnetic circuit designation Design weight, kg Power-to-size ratio, W
ÎË 22/34-20 0.079 6.5
ÎË 26/40-20 0.109 10.5
ÎË 26/40-25 0.136 13.2
ÎË 26/44-20 0.148 13.6
ÎË 30/52-20 0.212 22
ÎË 35/55-20 0.212 27
ÎË 35/64-20 0.338 39
ÎË 40/65-20 0.309 44
ÎË 40/64-25 0.367 54
ÎË 40/67-25 0.425 60
ÎË 45/70-25 0.423 70
ÎË 45/75-25 0.530 84
ÎË 50/80-25 0.574 105
ÎË 50/80-30 0.689 125
ÎË 54/96-32 1.186 218
ÎË 65/105-30 1.201 283
ÎË 65/105-40 1.601 375
ÎË 70/120-40 2.236 545
ÎË 80/130-40 2.472 715
ÎË 90/175-20 2.651 760
ÎË 80/140-40 3.107 850
ÎË 95/155-40 3.531 1207
ÎË 100/180-40 5.275 1785
ÎË 100/180-55 7.250 2450
ÎË 100/190-65 9.985 3260
ÎË 115/208-55 9.725 3770

* - overall dimensions may be changed optionally.

We also perform winding of magnetic circuits with an iron-nickel alloy (permalloy) strip.





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Regularly purchase
  • Transformer steel coils and plates;
  • Toroid coil winding machines either new or used;
  • Accessories for all types of domestic and foreign equipment (spools, SPTA (spare parts, tools and accessories), rollers, shuttles etc.).

Sell equipment
  • Heller Saw 8G663-100;
  • EGX Engraving Machine;
  • Armature cutting machine;
  • Surface grinding machine 3G71;
  • Surface grinding machine 3D711VF;
  • Turning machine SV18;
  • Turning machine S11MV;
  • Milling machine 676P;
  • Circular saw blade grinding machine.





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Vintor.com.ua © Vintor LLC
Vintor LLC
23400, Ukraine
Vinnitsa Region
Murovanye Kurilovtsy
Oktyabrskaya Street 70
Tel +38(04356)2-15-64
E-mail: mail@vintor.com.ua