EI Core with Gap Lamination

Technical Parameters

Specification	A	B	C	D	E	F	G	H	Air GAP	Stack	Hole	Apertureφ
EI 16	16	12	4	2	4	10	2
EI 19	19	12.5	5	2.5	4.5	10	2.5
EI 24	24	15	6	6	3	12	3
EI 26	26	18	6	3	7	15	3
EI 28	28	21	8	4	6	17	4		0.25 / 0.4 / 0.45 / 0.5 / 1
EI 28	28	27	8	4	6	23	4
EI 30	30	20	10	5	5	15	5		0.22 / 0.35 / 0.4 / 1.2
EI 30	30	20.8	10	5	5	15.3	5.5
EI 32 EI 32	32	26.5	9.5	4.75	6.5	21.7	4.75
EI 32 EI 32	32	22.78	9	4.5	7	18.3	4.5
EI 33	33	22	11	5.5	5.5	16.5	5.5
EI 33	33	28	11	5.5	5.5	22.5	5.5
EI 35	35	24.5	9.6	5	7.7	19.9	5
EI 35	35	23.4	11.6	5.84	5.84	17.46	5.84
EI 35.2	35.2	25.2	12.6	5	6.3	20.1	5.1		0.4 / 0.46 / 0.48 / 0.5
EI 36	36	24.5	10	6.5	6.5	18	6.5
EI 38.4	38.4	25.6	12.8	6.4	6.4	19.2	6.4		1.2	Yes
EI 38.4	38.4	44.8	12.8	6.4	6.4	38.4	6.4
EI 38.5	38.5	22	14	6	6.2	18
EI 41	41	27	13	6	8	21	6		1.2 / 2	Yes
EI 42	42	28	14	7	7	21	7	35	0.4 / 0.46 / 0.48 / 0.5 / 0.95 / 1.15 / 1.3 / 2		4	3.5
EI 42	42	28	14	7	7	21	7	35			4	3.5
EI 44	44	30	12	8	8	22	8
EI 48	48	32	16	8	8	24	8	40	0.6 / 0.5 / 0.8 / 0.9 / 0.93 / 1 / 2		4	3.5
EI 48	48	32	16	8	8	24	8	40			4	3.5
EI 50	50	34	14	9	9	25	9
EI 54	54	36	18	9	9	27	9	45	0.95 / 2		4	3.5
EI 56	56	38	16	10	10	28	10	46			4	5
EI 57	57	38	19	9.5	9.5	28.5	9.5	47.5	0.4 / 0.75 / 0.8 / 1.1 / 1.2 / 2		4	4
EI 57.2	57.2	39	19	9.5	9.5	31.55	7.45
EI 60	60	40	20	10	10	30	10	50	0.75 / 0.8 / 1 / 1.2 / 1.25 / 1.3		4	3.5
EI 66	66	44	22	11	11	33	11	55	0.8 / 1 / 1.2 / 1.45 / 1.5		4	4.5
EI 67	67	45.4	19	12	12	33.5	12	55			4	5
EI 67	67	46	20	10	13.5	36	10	57			4	5
EI 70	70	47	22	11	13	35	13		2.5
EI 75	75	50	25	12.5	12.5	37.5	12.5	62.5			4	5
EI 76.2 EI 76.2	76.2	50.8	25.4	12.7	12.7	38.1	12.7	63.5	1.8 / 2 / 2.54 / 2.2 / 2.5 / 1.3 / 3		4	5
EI 76.2 EI 76.2	76.2	50.8	22	11	16.1	39.8	11	65.2	1.8 / 2 / 2.54 / 2.2 / 2.5 / 1.3 / 3		4	5
EI 78	78	52	26	13	13	39	13	65	1.1 / 1.35 / 1.6 / 2		4	5
EI 78	78	53	22	14	14	39	14	64			4	5
EI 84	84	56	28	14	14	42	14	70	2.5		4	5
EI 84	84	56	28	14	14	42	14	70	2.08		4	4.5
EI 85.8	85.8	57.2	28.6	14.3	14.3	42.9	14.3	71.5	1.3 / 1.5 / 1.75 / 1.85 / 2.25 / 2.8 / 2.85 / 3		4	5
EI 90	90	60	30	15	15	45	15	75			4	6
EI 94	94	64	26	17	17	47	17	77			4	6
EI 96	96	64	32	16	16	48	16	80	1.15 / 1.5 / 2.2 / 2.3 / 2.45 / 2.5 / 2.7 / 3 / 5		4	6.3
											4	6.3
									Offset hole		4	6
EI 105	105	70	35	17.5	17.5	52.5	17.5	87.5	1.2 / 1.5 / 1.6 / 1.8 / 2 / 2.3 / 2.45 / 2.65 / 2.7 / 2.8 / 3 / 3.4 / 10.5		4	6
EI 106	106	72	30	19	19	53	19	87			4	7

Core Advantages

Precise air gap adjustment

Relying on the CNC precision production equipment of Jinma Electric and the calibration system of CNAS test station, it provides accurate and consistent air gap spacing to ensure the optimal performance of the magnetic circuit and the precise control of electromagnetic parameters.

Strongly inhibit magnetic saturation

Through the scientific air gap design, it can effectively slow down the process of magnetic saturation, keep the magnetic flux stable when the current load changes, improve the linearity of inductance, reduce harmonic components, and guarantee the sinusoidal waveform of output voltage.

Improve inductor stability

Optimise inductance consistency, reduce the impact of fluctuating working conditions on inductance parameters, support the needs of precision electromagnetic control, and adapt to high-demand power electronic equipment.

Excellent insulation performance

Adopting high-quality insulation materials strictly screened by Jinma Electric, with high dielectric strength, verified by lightning impact test and temperature rise test, to ensure the safe and reliable operation of the device and avoid the risk of leakage.

Significantly reduce core loss

Reduce the hysteresis loss and eddy current loss, combined with the experience of Gemma Electric magnetic circuit optimisation design, improve the energy efficiency, help products save energy and reduce consumption, in line with the trend of green environmental protection.

High Dimensional Precision

Adopting CNC laser cutting, precision stamping and other advanced technology, the dimensional tolerance is strictly controlled to ensure perfect fit with EI core and smooth assembly, which guarantees the stability of product performance.

Product Application Scene

Power Transformer

Optimise core magnetic properties, inhibit saturation phenomenon, reduce power loss, improve the stability of transformer operation, suitable for Jinma Electric 10KV~35KV transformer series and all kinds of custom transformers.

Switching Power Supply

Suitable for high-frequency power electronic equipment, to achieve efficient flux control, help power supply miniaturisation, high efficiency, used in new energy chargers, industrial power supplies and so on.

Inductors and Chokes

Provide stable inductance control, suitable for filtering, energy storage and other scenarios, to ensure the purity of the circuit signal, widely used in industrial automation equipment, power supply filtering system.

Frequently Asked Questions

What are the core advantages of Jinma Electric EI Core with Gap Lamination foils?

As a national high and new technology enterprise, the air gap sheet of Jinma Electric has the advantages of precise air gap control, strong anti-saturation, high insulation reliability, etc. based on 27 patented technologies and CNAS test station calibration, and it can respond to customised demands quickly, and its quality has been verified by the State Grid and other authoritative customers.

Why is it important to add an air gap in the magnetic circuit?

Air does not saturate the magnetic circuit, after adding air gap, the magnetic flux can follow the primary current more linearly, which not only reduces the power loss of the iron core, but also maintains the sinusoidal waveform of the output voltage, reduces the harmonic components, and improves the stability of the equipment.

Can the thickness of the air gap sheet be customised? What ranges are supported?

Yes, we can. Jinma Electric supports 0.01mm~5mm regular thickness customisation, special thickness can be achieved through technical evaluation, relying on Jinma Electric's precision production equipment to ensure the accuracy of the customised thickness.

What are the choices of product materials? Does it support special working conditions?

Conventional materials include insulating paper, PET film, epoxy resin, and we can also provide high temperature, high voltage and flame retardant composite insulating materials according to the requirements of working conditions to meet the needs of extreme environments.

What are the famous projects in which Jinma's air gap sheets have been applied?

Our products have been widely used in the distribution network projects of the State Grid and the Southern Power Grid, as well as large industrial enterprises, municipal projects, new energy power stations and other scenarios, and we have been recognised as an enterprise that ‘abides by the contract and respects the credit.

Do you support OEM service? How long is the delivery cycle?

Support. Jinma Electric provides complete OEM services, including technical solution design, manufacturing, quality testing and other full-process support; 7-15 days delivery for regular orders, 15-30 days delivery for customised orders according to demand, and urgent orders can be expedited.