Cool BLUE® Cores to reduce Motor bearing currents

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 capacities 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® cores 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

Standard designs for Core finishing:

  • Plastic box (material UL listed, QMFZ2 E41938)

Standard Cool BLUE® Cores, µ 30.000

Click on core type to show data-sheet

Type

Nom. Dim.
d
a x di x h
[mm]

Finished Dim.
D
a x Di x H
[mm]

lfe
[cm]

afe
[cm2]

Al @
10kHz
[µH]

Al @
100kHz
[µH]

Is*
[A]

PU
[pcs.]

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M-923

30 x 20 x 10

32,7 x 17,8 x 12,6

7,8

0,36

13,6 - 27,2

> 6,7

2,0

210

M-967

50 x 40 x 30

53,4 x 36,6 x 23,5

14,1

0,73

10,4 - 20,8

> 7,3

4,5

60

-

M-049

50 x 40 x 30

OVAL

14,1

0,80

12,6 - 28,4

> 6,3

3,5

60

M-112

63 x 50 x 30

68 x 43 x 36

17,7

1,44

23,3 - 46,6

> 11,0

4,5

16

M-649

63 x 50 x 30

OVAL

17,7

1,44

23,3 - 46,6

> 11,0

4,5

28

-

M-113

80 x 63 x 30

85 x 57 x 35,5

22,4

1,86

24,1 - 48,2

> 12,0

6,0

12

M-283

80 x 63 x 30

OVAL

22,4

1,86

24,1 - 48,2

> 12,0

6,0

12

M-114

100 x 80 x 30

105 x 75 x 35

28,2

2,25

22,5 - 45,0

> 11,2

7,5

12

M-284

100 x 80 x 30

OVAL

28,2

2,25

22,5 - 45,0

> 11,2

7,5

12

M-115

130 x 100 x 30

135 x 94 x 34

35,9

3,33

24,6 - 52,9

> 12,2

9,5

6

M-116

160 x 130 x 30

165 x 123 x 34

45,4

3,24

20,9 - 45,0

> 10,5

12

5

M-302

160 x 130 x 30

OVAL

44,7

3,30

20,9 - 45,0

> 10,5

12

5

M-117

200 x 175 x 30

208 x 166 x 37

58,8

2,74

12,3 - 24,6

> 6,0

15,5

2

M-111

236,5 x 201 x 30

OVAL

69,6

3,94

14,5 - 29,9

> 7,2

18,5

2

M-205

300 x 254 x 30

305 x 246,5 x 35

86,4

4,67

14,3 - 28,5

> 7,2

23

1

M-248

300 x 254 x 30

OVAL

87,1

5,20

15,8 - 31,5

> 7,9

23

5

* Saturation current Isat of NANOPERM®:
Peak value of the exiting current when the initial inductance level is dropped to 10 per cent. Saturation behaviour is very much depending on frequency, signal shape, leakage field, etc. so the mentioned current value is a calculated value for design help only and cannot be guaranteed.

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last update: 2017-02-20