Cores for power transformers SMPS

MST series

An amorphous material based on cobalt AMAG 186 is used, which has a very linear flat hysteresis loop with a relatively low magnetic permeability. Therefore, it is often used for precision current transformers.

Typical permeability (material specified when ordering):

   • AMAG 186A – 3300

   • AMAG 186B – 2200

   • AMAG 186C – 1400

Permeability depends little on the working amplitude of induction and frequency. The material has a negative temperature dependence of losses.

It is recommended for transformers of converters, in which a high magnetic permeability of the magnetic circuit and a high inductance of the primary winding are not desirable, the stability of this inductance is important.

 

 

Dimensions and main characteristics

MST series

Core name Overall dimensions in the container
[coated with paint]
(without container)
(D-d-H)
(mm)		 Midline length
Lm
(mm)		 The effect. section Ac
(mm2)		 Specific losses, W / kg, no more Coeff. squareness, no more

Relative magnetic permeability, not less

(AMAG 186B)

 Container material
100 kHz
0,3 T		 1 kHz
80 A/m		 100 kHz
ΔB = 1 T
Nominal Nominal Max Max Min
MST-10S-TH
[MSTP-10S-TH]		 11,3 - 5,3 - 5,6
[11,0 - 5,5 - 5,5]
(10,0 - 6,5 - 4,5)		 25,5 6,1 130
[140]		 0,1
[0,1] 		 1 900 Plastic
[Coating with paint]
MST-12S-TH
[MSTP-12S-TH]		 14,0 - 6,6 - 6,3
[13,0 - 7,0 - 5,5]
(12,0 - 8,0 - 4,5)		 31,4 7,0
MST-15A-TH
[MSTP-15A-TH]		 16,7 - 10,5 - 6,3
[16,0 - 11,0 - 5,5]
(15,0 - 12,0 - 4,5)		 42,4 5,26
MST-16A-TH
[MSTP-16A-TH]		 17,8 - 8,3 - 8,1
[17,0 - 9,0 - 7,0]
(16,0 - 10,0 - 6,0)		 40,8 14,04
MST-18S-TH
[MSTP-18S-TH]		 19,8 - 10,4 - 6,4
[19,0 - 11,0 - 5,5]
(18,0 - 12,0 - 4,5)		 46,5 10,5
MST-19A-TH
[MSTP-19A-TH]		 21,6 - 11,0 - 8,2
[20,5 - 11,7 - 7,0]
(19,5 - 12,7 - 6,0)		 50,6 15,5
MST-20A-TH
[MSTP-20A-TH]		 22,5 - 10,4 - 10,1
[21,0 - 11,5 - 9,0]
(20,0 - 12,5 - 8,0)		 51,0 23,4
MST-25A-TH
[MSTP-25A-TH]		 27,7 - 17,3 - 12,9
[26,0 - 19,0 - 11,0]
(25,0 - 20,0 - 10,0)		 70,7 19,5
MST-25S-TH
[MSTP-25S-TH]		 28,4 - 13,8 - 12,2
[26,0 - 17,0 - 11,0]
(25,0 - 16,0 - 10,0)		 64,4 35,1
MST-30S-TH
[MSTP-30S-TH]		 32,7 - 17,8 - 12,4
[31,0 - 19,0 - 11,0]
(30,0 - 20,0 - 10,0)		 78,5 37,5
MST-32S-TH
[MSTP-32S-TH]		 34,8 - 17,4 - 12,8
[33,0 - 19,0 - 11,0]
(32,0 - 20,0 - 10,0)		 81,6 45,0
MST-40A-TH
[MSTP-40A-TH]		 42,7 - 29,0 - 18,0
[41,0 - 31,0 - 16,0]
(40,0 - 32,0 - 15,0)		 113,0 46,8
MST-40S-TH
[MSTP-40S-TH]		 40,7 - 23,4 - 15,3
[39,0 - 25,0 - 13,0]
(38,0 - 26,0 - 12,0)		 100,5 56,16
MST-45S-TH
[MSTP-45S-TH]		 48,1 - 21,9 - 23,4
[46,0 - 26,0 - 21,0]
(45,0 - 25,0 - 20,0)		 100,9 156,0
MST-50S-TH 53,8 - 36,2 - 23,9
(50,0 - 40,0 - 20,0)		 141,3 78,0
MST-60S-TH 64,0 - 41,0 - 24,5
(60,0 - 45,0 - 20,0)		 164,9 117,0
MST-63A-TH 67,3 - 46,5 - 28,6
(63,0 - 50,0 - 25,0)		 177,4 126,8
MST-80A-TH 83,4 - 59,6 - 28,6
(80,0 - 63,0 - 25,0)		 224,5 156,7
MST-100S-TH 104,2 - 75,8 - 24,7
(100,0 - 80,0 - 20,0)		 282,6 156,0

Note:

  • 1) Operating temperature range in a plastic container from -60 ° C to + 120 ° C.
  • 2) Same with paint coating see "Construction"
  • 3) In the version with paint coating, the dimensions can be changed according to customer requirements

 

 

​ Program for calculating the transformer: push-pull SMPS (Calc_SMPS_Transformer) and forward SMPS (ForwardMST)

Application

  • Precision current transformers
  • Pulse transformers push-pull SMPS
  • Pulse transformers forward SMPS
  • Pulse transformers resonant SMPS

 

Additional parameters and characteristics

MST Series - Typical Loss vs.Frequency and Amplitude Induction
Серия MST - Типовая зависимость магнитной проницаемости от частоты

The main characteristics of the material used

  • Material AMAG 186
  • Amplitude of induction, Вm (25 °C) 0,9 T
  • Curie temperature, Tc 430 °C
  • Magnetostriction, less 0,05×10-6
  • Typical magnetic permeability (10 kHz) – 3300; 2200; 1400
  • Linear flat hysteresis loop, squareness factor (1kHz) no more than 0.1

Recording example

MST(P)-10S-TH, where:

  • MS - MSTATOR;
  • Т - application (transformers);
  • P - paint coating;
  • 10 - outer diameter, mm;
  • S - sectional designation;
  • TH - type of heat treatment (in a strong transverse magnetic field).