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Cool Blue® Tape Wound Cores Reduce Motor-Bearing Currents

coolbluegraph

coolblueCool 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. Temp Class E, Isolation Class B, Plastic cases fulfill UL-94HB