AMORPHOUS AND NANOCRYSTALLINE CORES

Comparing to ferrites, amorphous and nanocrystalline soft magnets have features high saturation, high permeability, low core loss and excellent stability. They are widely used in transformers, sensors, filters such as power transformers, distribution transformers and current transformer in power industry; drive transformers, power transformers, common-mode-chokes and filters, magnetic amplifiers, and bead cores in power electronics; ISDN interface transformers in IT industry; Earth-leakage-interrupters in household appliance; Electronic article surveillance (EAS) and Brazing fillers and solders for machine parts and electronic elements.

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Distribution Transformer Rectangle Cores

 

Applications:

Used in Uni- or Tri-phases oil and dry distribution transformers.

 

Amorphous Core

 

 

Features:

Structured as distributed-gap-connection-style with low loss, small exciting current, the amorphous core transformer drops the unloaded loss 70~80% and current 50% comparing that of the S9 silicon transformer. It is a highly energy saving and green product.

 

Comparison of typical specification of amorphous and silicon steel cored distribution transformers:

Features:	Iron based amorphous	Silicon Steel
Saturation induction (T)	1.54	2.03
Coercivity (A/m)	4	30
Max. Permeability (Gs/Os)	450000	40000
Loss (W/kg)	0.18 (50Hz, 1.3T)	1.2 (50Hz, 1.7T)
Exciting power (VA/kg)	0.5	0.83
Stack factor	>0.80	0.95
Magnetostriction (´10-6)	27	－
Resistivity (Wm∙cm)	130	0.45
Specific weight (g/cm3)	7.18	7.65
Crystallization Temp. (oC)	550	－
Curie Temp. (oC)	415	746
Tensile strength (Mpa)	1500	343
Vickers hardness (HV)	900	181
Thickness (μm)	30	300

 

 

Dimensions and weights of the Tri-phase oil style distribution transformer:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Capacity (KVA)	Core 1					Core 2					Total
	A	B1	C	D	W1	A	B2	C	D	W2	(W1+W2)×2
10	235	115	31	100	14.5	235	75	31	100	13	55
20	235	125	45	100	22.3	235	75	45	100	19.7	84
30	245	130	55	100	29.2	245	75	55	100	25.7	109.8
50	245	135	52	150	41.5	245	75	52	150	36.1	155.2
80	260	145	67	150	59.1	260	80	67	150	51.5	221.2
100	280	145	70	150	64.7	280	80	70	150	56.8	243

 

 

Note: Can be customized.

1．Tolerance: A: +3/-0; B₁ and B₂: +3/-0; C: max.; D: max.; surface coating: 4mm.

2．Window angle roundness: R: 6.4mm+1.5/-1.5.

3．Filling factor: 0.8

5．Loss per mass: P_1.3T/50Hz≤0.2W/kg.

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Reactor Rectangle Cores

 

Applications:

Widely used as primary transformers of UPS and output filter reactor of switch mode power supply.

 

Features:

Iron based amorphous strips have high saturation induction, high permeability, low loss (1/5 ~1/10 of silicon steel), low coercivity and good thermal stability.

 

Specifications:

CF-A: C: rectangle; F: Iron based amorphous; A: length of core.

In table: A: length of core; B: width; C: height; D: stack thickness; S: effective across section; L: length of circuit; M: mass; I: rated output current (A). CF-82* and CF-84A* are injection cores that have out dimensions as A+5, B+7, C+4, X-3, Y-4.

 

Grade	Core dimension (mm)						S (cm2)	L (cm)	M (g)	I (A)
	A	B	C	D	X	Y
CF-64	64	52	30	12	28	40	2.52	17.37	315	160
CF-78	78	40	40	10	20	58	2.8	18.74	380
CF-84	84	54	20	12	30	60	1.68	21.77	260
CF-84A*	84	52	20	11	30	59	1.54	21.3	242
CF-105	105	65	20	12.5	40	80	1.75	27.92	350	160
CF-117	117	75	20	20	35	77	2.8	28.68	580	250
CF-128	128	79	25	22	35	84	3.85	30.71	850	315
CF-140	140	97	30	26	45	88	5.46	34.76	1370	400
CF-140A	140	97	40	26	45	88	7.28	34.76	1820
CF-193	193	130	40	40	50	113	11.2	45.16	3640
CF-210	210	130	50	40	50	130	14	48.56	4895

 

Note: Can be customized.

 

Typical parameters of the C-type iron based amorphous core’s inductances and turns

 

Grade	Field current 50H peak (A)	Turn (N)	Inductance L		AL (±10%)
			2mm gap	4 mm gap
CF-84	120	10	21.8	16.5	(2mm gap) 0.206 (4mm gap) 0.151
	60	20	82.1	60.1
	40	30	182.6	132.6
	30	40	322.1	233.2
CF-117	138	10	27.9	19.4	(2mm gap) 0.269 (4mm gap) 0.184
	69	20	107.5	73.3
	46	30	239.4	163.2
	34	40	423.2	288.0
CF-140	170	15	70.0	53.0	(4mm gap) 0.308 (6mm gap) 0.233
	84	30	278.0	210.0
	56	45	620.0	476.0
	42	60	1098.0	826.0
CF-140A	172	15	96	68	(4mm gap) 0.396 (6mm gap) 0.300
	86	30	309	271
	57	45	801	605
	43	60	1418	1071
	34	75	2210	1668
CF-193	208	15	97	81	(6mm gap) 0.423 (8mm gap) 0.354
	104	30	381	319
	69	45	851	713
	52	60	1510	1265
	41	75	2358	1975

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Large Power Switch Mode Transformer Ring Cores

 

Applications:

Primary transformers in large power supply such as Reverse transition (RT) power supply, x-ray power supply, Laser power supply, communication power supply, high frequency induction heating power supply, UPS etc.

 

Common cores in RT transformers	Amorphous cores in RT transformers

 

Features:

Iron based nanocrystalline strips have high saturation induction, high permeability, and high Curie temperature, low loss, etc. Its saturation induction is 3 times as that of ferrite, which can output 2 times of the power in the same core sizes. The transformers with the nanocrystalline cores have a better overload tolerance. The loss is only a half to a fifth of that ferrite counterpart in the frequency range of 20 kHz and 50 kHz. The permeability is above ten times of that of ferrite, that makes small exciting current required, and as a result, small copper loss. The Curie temperature is three times of that of ferrite that makes high thermal tolerance of the transformers to the environment.

 

Comparison of typical specification for the nanocrystalline and ferrite cores

 

Basic parameter	Nanocrystalline	Ferrite
Saturation Bs (T)	1.25	0．5
Residual Br (T) (20KHz)	<0.20	0.20
Loss (20KHz/0.2T) (W/Kg)	<3.4	7.5
Loss (20KHz/0.5T) (W/Kg)	<35	-
Loss (50KHz/0.3T) (W/Kg0	<40	-
Permeability (20KHz) (Gs / Oe)	>20,000	2,000
Coercivity Hc (A/m)	<1.60	6
Saturated Magnetostriction (×10－6）	<2	4
Resistivity (muOhm·cm)	80	106
Curie Temp. (oC)	570	<200
Stack factor	>0.70	－

 

Specifications:

ONL-ODIDHT, O: ring; N: nanocrystalline; L: low residual; OD: out diameter; ID: inner diameter; HT: height. Example: NAC－ONL-1206030 (Abr. ONL-1206030) stands for Low residual induction, and ring shaped iron based nanocrystalline core. Its size is 120 OD x 60 ID x 30 mm H.

 

Inside the table: S: effective cross section; L: circuit length; M: mass; P: applied power at 20 kHz.

 

Grade	Core dimension (mm)			Cover size (mm)			S (cm2)	L (cm)	M (g)	P (KW)	Applied current
	OD	ID	HT	OD	ID	HT
ONL-644020	64	40	20	66	37	23	1.68	16.3	200	0.2-0.5
ONL-704025	70	40	25	72	37	28	2.62	17.3	300	0.5-1
ONL-755025	75	50	25	77	47	28	2.18	19.6	300	1-1.5
ONL-805020	80	50	20	82	46	23	2.10	20.4	300	2-4
ONL-805025	80	50	25	85	44	30	2.63	20.4	400	4-5	120A  160A
ONL-1006020	100	60	20	105	56	23	2.80	25.1	500	4-5	160A  200A
ONL-1037425	103	74	25	109	69	26.5	2.53	27.8	510	5-6
ONL-1206030	120	60	30	125	57	35	6.30	29.8	1200	8-15	315A
ONL-1207020	120	70	20	125	67	25	3.50	29.8	730	5- 6
ONL-1207025	120	70	25	125	67	30	4.38	29.8	920	6-7	200A  250A
ONL-1207030	130	70	30	125	67	35	5.25	29.8	1100	6-10	315A  400A
ONL-1308040	130	80	40	136	76	45	7.0	33.0	1650	15-20	400A  500A
ONL-1308050	130	80	50	136	76	55	8．75	33.0	2060	23-25	500A  630A
ONL-1309025	130	90	25	136	85	28	3．50	34.5	870	8-10
ONL-1309030	130	90	30	136	85	36	4．20	34.5	1045	12-18
ONL-1309050	130	90	50	136	85	56	7.0	34.5	1740	15-20	630A
ONL-1426735	142	67	35	150	60	40	9.18	32.8	2150	15-25

Note: can be customized.

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Intermediate Frequency Ring and Rectangle Cores

 

Applications:

All types of intermediate frequency transformer cores, in such as airplane transformers, railway system control transformers, transformer for metal part quenching equipments, laser power supply transformers. The frequency ranges 400 Hz to 15KHz.

 

 

Amorphous intermediate frequency transformer

 

 

 

Features:

Iron based amorphous with high saturation and low loss, is ideal for lightweight, limited space and high efficiency applications.

 

Specifications:

Rectangle and ring shaped.

Other dimensions or shapes can be customized.  

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Saturated Inductor Ring Cores

 

Applications:

Saturable inductor, pulse suppresser, pulse compressor and magnetic amplifier cores in High Frequency Switch-mode-power-supply applications

 

Magnetic amplifier cores

 

 

 

Features:

Cobalt or Iron based amorphous strips have extremal high maximum permeability (60~80×10⁴) and high residual ratio (Br/Bs) and small volume. They are ideal for the switch-mode-power-supply applications to stabilize and widely adjust voltage due to its high residual ratio. They are also ideal material for pulse compressor applications because the permeability will change acutely that leads to a good pulse delay effect.

 

Specifications:

1. Material

Saturation Br	Residual ratio Br/Bs	Coercivity Hc	Loss （f=20kHz, B=0.5T）	Loss （f=100kHz, B=0.3T）	Loss （f=200kHz, B=0.2T）
0.5－0.7T	>0.90	<2.5A/m	<35W/kg	<150W/kg	<350W/kg

 

2. Grades and dimensions:

 

(OCH－ODIDHT, where O: ring; C: Cobalt based; OD: out diameter; ID: inner diameter; HT: height.

 

Grade	Core dimension (mm)			Cover size (mm)
	OD	ID	HT	OD	ID	HT
OCH-060402	6	4	3	5.7	3.2	4.4
OCH-070502	7	5	2	7.5	3.5	4.1
OCH-090604	9	6	4	10.1	4.9	6.6
OCH-986545	9.8	6.5	4.5	11.5	4.6	6.5
OCH-120805	12.5	8	5	12.6	6.8	7.1
OCH-191105	19	11	5	19	9	9
OCH-221405	22	14	5	23	11	7.1
OCH-261605	26	16	5	27	13	7.1

Can be customized.

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Large Current Open-circuit Inductor Ring Cores

 

Applications:

Inductors in all type of power supply, especially with large current output filter inductor and power factor revising inductor in air conditioner power supply.

 

Features:

Iron based amorphous, open-circuit cores, excellent constant inductance performance and DC bias resistance and low loss.

 

Specifications:

 1. Material

Grade	Constant inductance range	Permeability	Loss P 0.05T/2KHz  (W/kg)
OFC3	0～1600A/m	500	< 1
OFC2	0～4000A/m	200～250	2～4
OFC1	0～8000A/m	100～150	5

 

2. Shapes and dimensions:

 

 

OFC－ODIDHT, where O: ring; F: Iron base amorphous; C: notch; ID: inner diameter; OD: out diameter; HT: height.

 

Grade	Core dimension (mm)			Cover size (mm)
	OD	ID	HT	OD	ID	HT
OFC2-201208	20	12	8	24.8	10.4	11.6
OFC2-201210	20	12	10	24.8	10.4	13.5
OFC2-261605	26	16	5	30.6	14.2	9.9
OFC2-261610	26	16	10	30.6	14.2	13.6
OFC2-322010	32	20	10	36.7	18	13.6
OFC2-402510	40	25	10	45	22.6	13.6
OFC2-402515	40	25	15	45	22.6	16.8
OFC2-503215	50	32	15	55.3	29.6	16.8
OFC2-644020	64	40	20	67.5	37.6	23.8
OFC2-704025	70	40	25	73.5	37.5	28.8

 

Note:  Can be customized.

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Creepage Switch Mutual Inductor Ring Cores

 

Applications:

Mutual inductors used in Creepage protector applications.

 

 

Creepage protector cores:

 

 

Creepage protect switch:

 

 

Features:

Iron-Nickel base amorphous or Iron based nanocrystalline strips have high permeability, low coercivity, being very sensitive to the electricity leakage especially at early stage of its magnetization with small acting current and good tolerance to strike of big current.

 

Specifications of Creepage switches:

 

OAH－ODIDHT, O: ring; A: iron-nickel based amorphous; H: high residual Br; OD: out diameter; ID: inner diameter; HT: height.

 

N₁/N₂: rate of turns; Delta-V: change of output volt after 3 strikes of 50 Ampere-turn current.

 

Grade	Core dimension (mm)			N1/N2	Input current  (mA)	Output current (mV)	Application	Delta-V
	OD	ID	HT
OAH-181306	18	13	6	1:1	50	>1	10~16A Single phase	<10%
OAH-191208	19	12	8	1:1	50	>2	10~16A Single phase	<10%
OAH-191410	19	14	10	1:1	50	>2	10~16A Single phase	<10%
OAH-221510	22	15	10	1:1	50	>3	10~30A Single phase	<10%
OAH-221514	22	15	14	1:1	50	>3.5	40~100A 3-phase	<10%
OAH-271910	27	19	10	1:1	50	>3.5	40~100A 3-phase	<10%
OAH-181310	18	13	10	1:1	50	>3	10~30A Single phase	<10%
OAH-181320	18	13	20	1:1	50	>4	6~6A Single phase	<10%
OAH-201120	20	11	20	1:1	50	>5	6－16A Single phase	<10%
OAH-241420	24	14	20	1:1	100	>10	10－30A Single phase	<10%
OAH-332315	33	23	15	1:1	100	>8	30－40A 3-phase	<10%
OAH-332325	33	23	25	1:1	100	>12	40A 3-phase	<10%
OAH-654335	65	43	35	1:1	100	>12	40A 3-phase	<10%

 

Specifications of Creepage protecting switch cores:

 

ON－ODIDHT, where: O: ring; N: nanocrystalline material; OD: out diameter; ID: inner diameter; HT: height.

 

Grade	Core dimension (mm)
	OD	ID	HT
ON-201210	20	12	10
ON-191410	19	14	10
ON-251515	25	15	15
ON-262010	26	20	10
ON-302010	30	20	10
ON-302015	30	20	15
ON-332325	33	23	25
ON-504010	50	40	10
ON-605010	60	50	10

 

Note: can be customized.

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Wave Filter Inductor Ring Cores

 

Applications:

Output wave filter inductors, smoothing inductors and storage inductors in power supplies and ballasts in energy saving lights, different-mode inductor in EMC filters.

 

Inductors

 

 

Features:

Iron based amorphous and nanocrystalline strips or cobalt based amorphous. They feature high saturation and high inductance.

 

Specifications:

1. Material

Grade	Permeability (Gs/Os)	Loss P 0.05T/2KHz  (W/kg)
OFP1-	250 ~ 400	< 1.5
OFP2-	600 ~ 800	< 1.0
OFP3-	1000 ～1200	< 0.5

 

2. Shapes and dimensions:

 

OFP*－ODIDHT, O: ring; P: closed; OD: out diameter; ID: inner diameter; HT: height.

 

Grade	Core dimension (mm)			Ampere X coil (A·N)	Permeability μ (Gs/Os)
	OD	ID	HT
OFP1-161005	16	10	5	90-120	250-400
OFP1-201210	20	12	10	120-150
OFP1-261610	26	16	10	150-200
OFP1-322010	32	20	10	190-250
OFP3-161005	16	10	5	15-30	1000-2000
OFP3-201210	20	12	10	20-40
OFP3-261610	26	16	10	25-50
OFP3-322010	32	20	10	30-60

 

Note: Can be customized.

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Aiguille suppresser ring cores and beads

 

Applications:

Cores used in Saturable inductor, aiguille suppresser and pulse compressor of high frequency switch-mode power supplies and magnetic amplifiers.  

 

Magnetic amplifier cores

 

 

Features:

Cobalt or Iron based amorphous have extremal high maximum permeability (60~80×10⁴) and high residual ratio (Br/Bs) and small volume. They are ideal for the applications such as amplifier of switch-mode-power-supply to stabilize and adjust output voltage in a wide range because of its high residual ratio. They are also ideal material for the applications such as pulse compressor because of the acute changing in its permeability that leads to a good pulse delay effect.

 

Specifications:

1. Material:

Saturation Br	Residual ratio Br/Bs	Coercivity Hc	Loss (f=20kHz, B=0.5T)	Loss (f=100kHz, B=0.3T)	Loss (f=200kHz, B=0.2T)
0.5－0.7T	>0.90	<2.5A/m	<35W/kg	<150W/kg	<350W/kg

 

 

 

 

2. Shapes and dimensions:

OCH－ODIDHT, O: ring; C: cobalt based amorphous; OD: out diameter; ID: inner diameter; HT: height.

 

 

 

 

Grade	Core dimension (mm)			Cover size (mm)
	OD	ID	HT	OD	ID	HT
OCH-060402	6	4	3	5.7	3.2	4.4
OCH-070502	7	5	2	7.5	3.5	4.1
OCH-090604	9	6	4	10.1	4.9	6.6
OCH-986545	9.8	6.5	4.5	11.5	4.6	6.5
OCH-120805	12.5	8	5	12.6	6.8	7.1
OCH-191105	19	11	5	19	9	9
OCH-221405	22	14	5	23	11	7.1
OCH-261605	26	16	5	27	13	7.1

 

Note: Can be customized.

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Minitype Switch-mode Transformer Ring Cores

 

Applications:

Primary transformer, pulse transformer and control transformer in all types of small and medium scale switch-mode power supply module. They are suitable for single end, bridge and push-pull operating style.

 

Minitype switch-mode transformer ring cores

 

 

Features:

Cobalt based amorphous or iron based nanocrystalline strips have high permeability, low coercivity, low loss and low heat emission. The material specification are optional for specific operating styles of the switch-mode power supply.

 

Specifications:

1. Material

 

Material	Bs (T)	Low Br		Medium Br		High Br
		Br/Bs	P (w/kg)	Br/Bs	P (w/kg)	Br/Bs	P (w/kg)
Iron based Amorphous	1.55	<0.2	P 0.35/10K <18	0.6	P0.35/10K <20	>0.9	P0.35/10K <25
Cobalt based Amorphous	0.60	<0.2	P0.3/200K <400	0.6	P0.3/200K <450	>0.9	P0.3/200K <600
Iron based Nano-	1.25	<0.2	P0.3/100K <200	0.6	P0.3/100K <300	>0.85	P0.3/100K < 400

 

2. Shapes and dimensions:

 

ON－ODIDHT, O: ring; N: nanocrystalline; OD: out diameter; ID: inner diameter; HT: height; S: effective cross area; L: average length of circuit.

Grade	Core dimension (mm)			Cover size (mm)			Cross area (cm2)	Length (cm)
	OD	ID	HT	OD	ID	HT
ON-090604	9	6	4	10.1	4.9	6.6	0.039	2.40
ON-986545	9.8	6.5	4.5	11.5	4.6	6.5
ON-120805	12	8.5	5	12.6	6.8	7.1	0.065	3.22
ON-191105	19	11	5	19	9	9	0.13	4.70
ON-201205	20	12	5	21	10	9	0.14	5.03
ON-221405	22.	14	5	23	11	7.1	0.13	5.70
ON-261605	26	16	5	30.6	14.2	9.9	0.163	6.60
ON-120910	12	9	10	17	7	13	0.105	3.30
ON-191410	19	14	10	23	12	13	0.175	5.18
ON-201205	20	12	5	24.8	10.4	8.6	0.14	5.3
ON-201208	20	12	8	24.8	10.4	11.6	0.20	5.03
ON-201210	20	12	10	24.8	10.4	13.5	0.26	5.03
ON-241515	24	15	15	28.0	13	18.5	0.47	6.12
ON-261610	26	16	10	30.6	14	13.6	0.325	6.60
ON-281912	28	19	12	33	17	15.5	0.77	7.38
ON-302010	30	20	10	36.7	1 8	13.6	0.35	7.85
ON-322010	32	20	10	38.7	18	13.6	0.39	8.17
ON-302015	30	20	15	36.7	18	18.6	0.525	7.85
ON-402510	40	25	10	45	22.6	13.6	0.488	10.2
ON-402515	40	25	15	45	22.6	16.8	0.732	10.2
ON-503210	50	32	10	55.3	29.6	11.8	0.585	12.9
ON-503215	50	32	15	55.3	29.6	16.8	0.88	12.9
ON-503220	50	32	20	55.3	29.6	21.8	1.17	12.9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note:

1. Can be customized.
2. Only the sizes of core listed. The core material specification should be determined per the operating style of the switch-mode power supply. Low Br core material for single end switch-mode power supply, and high and medium Br for bridge or push-pull ones.