Silicon Steel Toroidal Cores - In Stock

 

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Benefits from using toroidal silicon steel cores

 

Design Information

As always in  transformer design the user may vary the main parameters like duty cycle, frequency, induction level and the iron/copper ratio in order to reach specific objectives, or the next larger core size may be selected to accommodate a larger number of secondary windings, high voltage windings, multiple tapings or electrostatic screens. In every case the outcome will be a power rating different from the 60 Hz/15kG power capacity listed in the table.

Going the other way, when used for autotransformers at e.g. 120V/240V step up or step down the power capacity is twice the listed VA rating.

 

Custom Designs

Cores with custom specified OD, ID and height are available from a fraction of an ounce to 100 lbs or more. If required, please call us at 1-800-836-5920 or send an e-mail to sales@alphacore.com.

Ordering Information

Our cores are available in three different configurations. You may order the cores as bare cores, epoxy fluidized or encapsulated in polycarbonate film.

The table below contains basic design information for our standard cores; approximate dimensions and the weight of completed power transformers. It also lists suggested voltage per turn, as well as the estimated voltage drop under load which is useful for calculating secondary windings. 
The temperature rise listed is for complete transformers with equally loaded primaries and secondaries, operating at 100% duty cycle.

 

We stock the following Silicon Steel Toroidal Cores

P/N
#

ID
 (in)

OD 
 (in)

HT 
 (in)

   BUILD  
(in)

Finished
Transformer
Weight (lbs)

Estimated VA Rating

V/TURN
@ 60Hz 15kG

%
Voltage Drop 

0

1.375

2.000

1.000

0.313

0.43

46

0.077

17.5

10

1.500

2.375

1.000

0.438

0.70

77

0.107

11.0

20

1.625

2.875

1.000

0.625

1.16

130

0.153

8.0

30

1.750

3.250

1.000

0.750

1.55

180

0.184

6.7

40

1.875

3.375

1.125

0.750

1.83

233

0.207

6.3

50

2.000

3.500

1.250

0.750

2.12

295

0.230

6.0

60

2.125

3.750

1.375

0.813

2.70

396

0.274

4.7

70

2.250

4.000

1.500

0.875

3.38

522

0.322

4.5

80

2.500

4.375

1.500

0.938

3.98

690

0.345

4.0

90

2.625

4.500

1.625

0.938

4.47

824

0.373

3.8

100

2.750

4.875

1.625

1.063

5.42

1026

0.423

3.6

110

3.000

5.250

1.750

1.125

6.69

1392

0.483

3.5

120

3.250

5.500

2.000

1.125

8.11

1867

0.551

3.5

130

3.375

5.875

2.000

1.250

9.53

2237

0.613

3.3

140

3.500

6.125

2.125

1.313

11.06

2683

0.684

3.0

150

3.625

6.375

2.500

1.375

14.16

3548

0.843

2.7

160

4.000

7.125

2.500

1.563

17.90

4909

0.957

2.5

170

4.250

7.375

3.000

1.563

22.45

6650

1.149

2.3

180

4.375

8.000

3.000

1.813

27.72

8174

1.333

2.1

190

4.750

8.625

3.000

1.938

32.03

10300

1.425

2.0

200

5.000

9.000

3.500

2.000

40.38

13744

1.716

1.8

210

5.500

10.000

3.500

2.250

50.29

18710

1.930

1.0

220

6.000

11.000

3.500

2.500

61.29

24740

2.145

1.2

L10

1.375

2.500

0.562

0.563

0.50

47

0.077

14.3

L20

1.750

3.250

0.750

0.750

1.16

135

0.138

8.3

L30

2.250

4.000

1.000

0.875

2.25

348

0.214

6.5

L40

2.750

5.250

1.125

1.250

4.64

835

0.345

4.8

L50

3.000

6.000

1.375

1.500

7.65

1458

0.506

3.1

L60

4.000

7.000

1.500

1.500

10.20

2827

0.551

3.0

L70

4.375

8.000

1.750

1.813

16.17

4768

0.777

2.6

L80

4.750

8.625

2.000

1.938

21.35

6867

0.950

2.4

!

 

!
PN# 0
Weight: lbs

Toroidal Core PN# 0

Epoxy Coated Toroid, Id=1.375", Od=2.000", Ht=1.000", 46 VA Relative Power Handling, 0.077 V/turn @60Hz, 15KG
PN# 10
Weight: lbs

Toroidal Core PN# 10

Epoxy Coated Toroid, Id=1.500", Od=2.375", Ht=1.000", 77 VA Relative Power Handling, 0.107 V/turn @60Hz, 15KG
PN# 20
Weight: lbs

Toroidal Core PN# 20

Primary Winding Option Available PN# 20P
Epoxy Coated Toroid, Id=1.625", Od=2.875", Ht=1.000", 130 VA Relative Power Handling, 0.153 V/turn @60Hz, 15KG
PN# 30
Weight: lbs

Toroidal Core PN# 30

Primary Winding Option Available PN# 30P
Epoxy Coated Toroid, Id=1.750", Od=3.250", Ht=1.000", 180 VA Relative Power Handling, 0.184 V/turn @60Hz, 15KG
PN# 40
Weight: lbs

Toroidal Core PN# 40

Primary Winding Option Available PN# 40P
Epoxy Coated Toroid, Id=1.875", Od=3.375", Ht=1.125", 233 VA Relative Power Handling, 0.207 V/turn @60Hz, 15KG
PN# 50
Weight: lbs

Toroidal Core PN# 50

Primary Winding Option Available PN# 50P
Epoxy Coated Toroid, Id=2.000", Od=3.500", Ht=1.250", 295 VA Relative Power Handling, 0.230 V/turn @60Hz, 15KG
PN# 60
Weight: lbs

Toroidal Core PN# 60

Primary Winding Option Available PN# 60P
Epoxy Coated Toroid, Id=2.125", Od=3.750", Ht=1.375", 396 VA Relative Power Handling, 0.274 V/turn @60Hz, 15KG
PN# 70
Weight: lbs

Toroidal Core PN# 70

Primary Winding Option Available PN# 70P
Epoxy Coated Toroid, Id=2.250", Od=4.000", Ht=1.500", 522 VA Relative Power Handling, 0.322 V/turn @60Hz, 15KG
PN# 80
Weight: lbs

Toroidal Core PN# 80

Primary Winding Option Available PN# 80P
Epoxy Coated Toroid, Id=2.500", Od=4.375", Ht=1.500", 690 VA Relative Power Handling, 0.345 V/turn @60Hz, 15KG
PN# 90
Weight: lbs

Toroidal Core PN# 90

Primary Winding Option Available PN# 90P
Epoxy Coated Toroid, Id=2.625", Od=4.500", Ht=1.625", 824 VA Relative Power Handling, 0.373 V/turn @60Hz, 15KG
PN# 100
Weight: lbs

Toroidal Core PN# 100

Primary Winding Option Available PN# 100P
Epoxy Coated Toroid, Id=2.750", Od=4.875", Ht=1.625", 1026 VA Relative Power Handling, 0.423 V/turn @60Hz, 15KG
PN# 110
Weight: lbs

Toroidal Core PN# 110

Primary Winding Option Available PN# 110P
Epoxy Coated Toroid, Id=3.000", Od=5.250", Ht=1.750", 1392 VA Relative Power Handling, 0.483 V/turn @60Hz, 15KG
PN# 120
Weight: lbs

Toroidal Core PN# 120

Primary Winding Option Available PN# 120P
Epoxy Coated Toroid, Id=3.250", Od=5.500", Ht=2.000", 1867 VA Relative Power Handling, 0.551 V/turn @60Hz, 15KG
PN# 130
Weight: lbs

Toroidal Core PN# 130

Primary Winding Option Available PN# 130P
Epoxy Coated Toroid, Id=3.375", Od=5.875", Ht=2.000", 2237 VA Relative Power Handling, 0.613 V/turn @60Hz, 15KG
PN# 140
Weight: lbs

Toroidal Core PN# 140

Primary Winding Option Available PN# 140P
Epoxy Coated Toroid, Id=3.500", Od=6.125", Ht=2.125", 2683 VA Relative Power Handling, 0.684 V/turn @60Hz, 15KG
PN# 150
Weight: lbs

Toroidal Core PN# 150

Epoxy Coated Toroid, Id=3.625", Od=6.375", Ht=2.500", 3548 VA Relative Power Handling, 0.843 V/turn @60Hz, 15KG
PN# 160
Weight: lbs

Toroidal Core PN# 160

Epoxy Coated Toroid, Id=4.000", Od=7.125", Ht=2.500", 4909 VA Relative Power Handling, 0.957 V/turn @60Hz, 15KG
PN# 170
Weight: lbs

Toroidal Core PN# 170

Epoxy Coated Toroid, Id=4.250", Od=7.375", Ht=3.000", 6650 VA Relative Power Handling, 1.149 V/turn @60Hz, 15KG
PN# 180
Weight: lbs

Toroidal Core PN# 180

Epoxy Coated Toroid, Id=4.375", Od=8.000", Ht=3.000", 8174 VA Relative Power Handling, 1.333 V/turn @60Hz, 15KG
PN# 190
Weight: lbs

Toroidal Core PN# 190

Epoxy Coated Toroid, Id=4.750", Od=8.625", Ht=3.000", 10300 VA Relative Power Handling, 1.425 V/turn @60Hz, 15KG