Iron-Based nanocrystalline materials have enjoyed increased acceptance in modern electronic designs only in the past few years. Nanocrystalline materials have a proven record of high performance, there has been improved reliability in the manufacturing process and this material is now available from multiple sources.
Nanocrystalline soft magnetic materials are now superior to permalloys, ferrites and even amorphous cobalt based alloys in a growing range of applications. The table below identifies different properties of the various soft magnetic materials that are available today.
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Magnetec Information Paper: Smart Grid Technology
Cool Blue for Inverter Drive Motor Systems
A primary application is common mode chokes specifically designed to reduce EMI voltage spikes in Inverter Drive Motor Systems.
Cool Blue® toroids made from the nanocrystalline material NANOPERM are being used increasingly to reduce damaging motor bearing currents in modern high power inverter systems operating at high switching frequencies. As a result of these unwanted currents, the bearings corrugate, leading to electrical breakdown in the lubrication and finally to a standstill of the entire motor.
The use of Cool Blue® cores not only significantly reduces the over voltage peaks at the motor terminals, but also suppresses the asymmetrical EMI currents which are generated by the parasitic currents of the motor itself together with the motor cable. In order to achieve an efficient reduction in these destructive effects, one or more Cool Blue® of suitable geometry have to be placed together over the connector cables in the DC-link as well as at the inverter output. In this configuration, the cores operate as a common-mode choke.
This method significantly increases the service life of the motor bearings and thus reduces maintenance costs and standstill periods.
| TYPE (click for pdf) |
Nominal OD x ID x TH (mm) |
Physical OD x ID x TH (mm) |
Mass (gm) |
Path Length le (cm) |
Core Area Ae (cm2) |
Al Value @10KHz (µH) |
Current Icm (A) |
|---|---|---|---|---|---|---|---|
| M-112 | 63 x 50 x 30 | 68 x 43 x 36 | 204 | 17.7 | 1.44 | 23.3 – 46.6 | 4 |
| M-113 | 80 x 63 x 30 | 86 x 55 x 36 | 338 | 22.4 | 24 | 24.1 – 48.2 | 6 |
| M-283 | 80 x 63 x 30 | OVAL | 338 | 22.4 | 24 | 24.1 – 48.2 | 6 |
| M-114 | 100 x 80 x 30 | 108 x 70 x 36 | 500 | 28.2 | 2.4 | 22.5 – 45 | 8 |
| M-284 | 100 x 80 x 30 | OVAL | 500 | 28.2 | 2.4 | 22.5 – 45 | 8 |
| M-115 | 130 x 100 x 30 | 135 x 92 x 36 | 958 | 35.9 | 3.6 | 26.4 – 52.9 | 9 |
| M-142 | 130 x 100 x 30 | OVAL | 604 | 36.7 | 2.22 | 16 – 32 | 8 |
| M-116 | 160 x 130 x 30 | 164 x 122 x 36 | 1,208 | 45.4 | 3.6 | 20.9 x 41.9 | 12 |
| M-302 | 160 x 130 x 30 | OVAL | 1,208 | 45.4 | 3.6 | 20.9 x 41.9 | 12 |
| M-117 | 200 x 175 x 30 | 204 x 166 x 36 | 1,302 | 58.8 | 3 | 13.5 – 26.9 | 16 |
| M-111 | 240 x 200 x 30 | OVAL | 2,219 | 69.9 | 4.32 | 16.4 – 32.8 | 20 |
| M-248 | 300 x 254 x 30 | OVAL | 3,242 | 86.7 | 54 | 15.3 – 30.5 | 22 |
| M-205 | 300 x 250 x 30 | 304 x 246 x 34 | 3,722 | 86.2 | 5.85 | 18 x 36 | 23 |
| M-503 | 500 x 450 x 30 | 504 x 446 x 36 | 6,430 | 149.1 | 5.85 | 10.3 – 20.7 | 40 |
|
Operating Temperature Range: -40 to +120ºC. |
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Nanocrystalline over Ferrite or Permalloy
- Significant Reduction of Build Volume of Inductive Component
- Less Heat Dissipation due to Reduced Number of Turns
- Stable Operation in a Temperature Range of –25 to +120°C.
- Larger Safety Margins
- Variable Toroidal Geometries—Tooling costs may apply
Secondary Mainstream Applications
- Power transformers in push-pull converters (full wave) from a few hundred watts to several KW
- Trigger transformers for IGBT-driven converters
- Current Transformers
- Transformers for Passive Earth Leakage Circuit Breakers (Europe primarily)