Cores Amorphous with high permeability

MSF series

Toroidal cores of the MSF series (KVSU.684459.092TU) are made of a thin (18 ± 2 μm) amorphous ribbon AMAG170 based on cobalt with a high initial magnetic permeability.

Designed for use as a magnetic system of measuring current transformers, residual current devices, common-mode filter chokes, etc.

Electronic devices are more and more around us in everyday life, and the issues of electromagnetic compatibility (EMC) are becoming more and more acute. In this regard, the requirements for common-mode filters are also becoming more stringent, which are used to protect devices from the penetration of high-frequency interference from the power supply network and to protect against the penetration of high-frequency interference into the network from switching power supplies and other devices using the switching mode.

The common mode filter application area covers a wide range of devices: telecommunications systems, switching power supplies, frequency converters, uninterruptible power supplies (UPS), etc.

With a typical magnetic permeability of 110,000 or more, the MSF series common mode filter chokes require fewer winding turns, resulting in low parasitic capacitance and high resonant frequency. They are smaller and provide higher insertion loss over a wide frequency range than traditional ferrite and permalloy products.

 

 

Dimensions and main characteristics

MSF series

Core name ​​
Dimensions*
in container
(without container)
(D-d-H)
(mm)
Effective section
Seff,
(mm2)
Centerline length
lmid.,
(mm)
 Weight in container, g
(without container, g) **		 Inductance factor
AL ***, μH / turn2
(+40/-25%)
10 kHz
10
mA×turn		 100 kHz
10
mA×turn
 

In an aluminum container
MSFL-04S-T

4,3 - 2,2 - 1,3
(4,0 - 2,5 - 1,0)		 0,60 10,2 (0,05) 6,2 1,5
MSFL-04A-T

4,2 - 2,2 - 2,4
(4,0 - 2,4 - 2,0)		 1,28 10,0 (0,10) 18,7 3,2
MSFL-06S-T

6,7 - 2,7 - 2,8
(6,4 - 3,0 - 2,5)		 3,40 14,8 (0,39) 26,7 5,8
MSFL-06A-T

6,7 - 3,1 - 4,0
(6,3 - 3,5 - 3,5)		 3,92 15,4 (0,46) 30,7 6,4
MSFL-07A-T

7,3 - 3,1 - 4,1
(7,0 - 3,5 - 3,8)		 5,32 16,5 (0,68) 33,6 8,1
MSFL-08A-T

8,7 - 3,0 - 1,4
(8,3 - 3,5 - 1,0)		 1,92 18,5 (0,27) 11,4 2,6
MSFL-08S-T

8,3 - 3,7 - 3,3
(8,0 - 4,0 - 3,0)		 4,80 18,8 (0,70) 30,7 6,4
MSFL-09A-T

9,4 - 4,0 - 1,1
(9,0 - 4,3 - 0,7)		 1,32 20,9 (0,21) 6,9 1,6
MSFL-09S-T

9,4 - 4,0 - 1,4
(9,0 - 4,3 - 1,0)		 1,88 20,9 (0,30) 10,0 2,3
 

In a plastic container
MSF-10S-T

11,4 - 5,0 - 6,1
(9,8 - 6,5 - 4,5)		 5,9 25,6 1,62
(1,17)		 34,7 5,8
MSF-12A-T

14,2 - 6,4 - 5,0
(12,0 - 8,0 - 3,0)		 4,8 31,4 1,76
(1.16)		 15,1 3,8
MSF-12S-T

14,2 - 6,4 - 6,5
(12,0 - 8,0 - 4,5)		 7,2 31,4 2,54
(1,74)		 22,8 5,8
MSF-15A-T

16,9 - 10,0 - 6,5
(15,0 - 12,0 - 4,5)		 5,4 42,4 2,56
(1,76)		 12,6 3,2
MSF-15S-T

17,1 - 8,4 - 6,7
(15,0 - 10,0 - 4,5)		 9,0 39,3 3,12
(2,72)		 23,6 5,8
MSF-16A-T

18,0 - 8,0 - 8,3
(16,0 - 10,0 - 6,0)		 14,4 40,8 4,93
(4,53)		 35,2 8,9
MSF-18S-T

20,0 - 10,2 - 6,6
(18,0 - 12,0 - 4,5)		 10,8 47,1 4,82
(3,92)		 22,8 5,8
MSF-19A-T

21,8 - 10,8 - 8,1
(19,5 - 12,7 - 6,0)		 16,3 50,6 7,55
(6,35)		 32,1 8,1
MSF-20A-T

22,7 - 10,2 - 10,3
(20,0 - 12,5 - 8,0)		 24,0 51,0 12,33
(9,43)		 46,9 11,8
MSF-25A-T

27,9 - 17,1 - 12,9
(25,0 - 20,0 - 10,0)		 20.0 70,7 15,68
(10.88)		 27,9 7,11
MSF-26S-T

28,6 - 13,6 - 12,4
(26,0 - 16,0 - 10,0)		 40,0 65,9 25,41
(20,31)		 60,0 15,2
MSF-30S-T

33,0 - 17,6 - 12,9
(30,0 - 20,0 - 10,0)		 40,0 78,5 30,38
(24,18)		 51,2 12,8
MSF-32S-T

34,8 - 17,4 - 12,8
(32,0 - 20,0 - 10,0)		 48,0 81,6 37,47
(30,17)		 59,0 14,8
  • * OD, HT, D, H – no more; ID, d – not less.
  • ** Deviation of mass of cores (without container) no more than ± 10%.
  • *** Rated value of inductance of a single-turn winding.

Note:

  • It is allowed to supply cores of other standard sizes, including in containers supplied by the Customer, under a separate agreement.

 

 

 

​ Program for calculating common-mode filter chokes

​ Technical conditions (extract) KVSU.684459.092 TU (MSF series)

Application

  • Common Mode EMC Filters
  • High precision current transformers
  • High precision pulse transformers
  • SAD (Safety Disconnect Devices)
  • Telecommunications and digital data transmission systems 

Advantages

  • High magnetic permeability
  • Reduces the size of filter chokes
  • Reduces the number of turns
  • Low resistance
  • Low losses in the magnetic circuit
  • Low wire loss
  • High impedance over wide frequency ranges
  • Low profile

 

Additional parameters and characteristics

Dependence of magnetic permeability on frequency
Зависимость магнитной проницаемости от частоты
Temperature dependence of inductance
Amplitude permeability versus induction amplitude
Initial magnetization curve
Dependence of the impedance of a single-turn winding on the frequency
(MSF-20A-TH)

The main characteristics of the material used

  • Material AMAG 170
  • Amplitude of induction, Bm (25°C) 0,55 T
  • Amplitude of induction, Bm (90°C) 0,50 T
  • Curie temperature, Tc = 200°C
  • Operating temperature range from –60°C до +100°C
  • Magnetostriction, less 0,1x10-6 
  • Initial magnetic permeability (50 Hz) 110 000 (+40/-25%)
  • Initial magnetic permeability (100 kHz) 20 000 (+40/-25%)

Design

  1. The twisted ribbon core is placed in a rigid protective container made of glass-filled polyamide and mechanically fixed with silicone sealant. The container has rounded edges and is designed for direct wrapping with thick wire. The container provides reliable mechanical protection of the amorphous material and the preservation of its properties.
  2. For small-sized core, a thin-walled aluminum alloy container is used instead of a plastic container. Temperature range from –60 °C to +100 °C.

 

Recording example

MSFL-09A-T, где

  • MS – MSTATOR;
  • F – assignment (Filters);
  • 09 – outer diameter, mm;
  • A, S – sectional designation;
  • L  – aluminum container;
  • No index - plastic container;
  • T – type of heat treatment (in a transverse magnetic field)