Stator winding insulation (per CEI EN 60034-1 and IEC 34-1)
Top quality insulating materials are used in the windings.
The insulation in the motor isolation system are class H, and the maximum temperature allowed for these products is 180 °C.
The ambient temperature considered is 40 °C.
The motor has an overall standard temperature insulation rating of class F.

In standard configurations, the copper wire is insulated by a double layer of insulating enamel.
A NOMEX/D.M./D.M.D./N.M./N.M.N./M. film that wraps entirely around the coil side insulates the copper and iron from one another.

For sizes above IEC 90 and for motors specifically ordered for use with inverters, the phases are further isolated by another layer of NOMEX/D.M./D.M.D./N.M./N.M.N./M. to protect the motors from voltage peaks that usually occur during use.
Motor with insulation system, may be supplied upon agreement with the manufacturer.
Once the winding is finished, it is further impregnated with insulating paint and hardened by kiln firing to compact the entire unit, providing high resistance to electrical, mechanical and chemical stress.

Below is a graph showing the operating temperatures possible for stator windings based on the insulation rating shown on the machine plate.

Where:

N = NOMEX

N.M.N. = NOMEX – MYLAR – NOMEX

D.M.D. = DACRON – MYLAR – DACRON

N.M. = NOMEX – MYLAR

D.M. = DACRON – MYLAR

M. = MYLAR

 

 

Wound Stators
High-quality magnetic sheet metals are used for most of the production, CP=10 W/kg (50Hz/1T) to ensure constant high performance.
The copper used is impregnated with a double layer of insulating enamel to ensure high resistance to electrical, thermal and mechanical stress.
The layers of insulating material are made of NOMEX/D.M./D.M.D./N.M./N.M.N./M. with insulation class H.
The standard insulation class of the motor is F, motor with insulation system as Tab. 9, may be supplied upon agreement with the manufacturer.
The ambient temperature considered is 40 °C.
Tropicalization processes are available through impregnation with paints having high hygroscopic qualities, for use in areas with high ambient humidity >60% R.H.

Voltages and frequencies (per CEI EN 60034-1)
The Motors of the company NERI can operate at different voltages than the nominal within a range of ± 10% for three-phase motors and ± 5% for single-phase motors for short periods.

Frequencies at 60 Hz
All electrical data in this catalogue refer to three-phase wound motors at 50 Hz.
These may be connected to 60 Hz, taking into account the multiplier indicative coefficients in the table below:

 

Rated voltage at 50 Hz
Volt at 60 Hz
Rated power W
rpm
ln
la / ln
Ca / Cn
Cmax / Cn

220

220

1,00

1,2

1,20

0,80

0,80

0,80

220

230

1,05

1,2

1,15

0,85

0,85

0,85

220

240

1,06

1,2

1,10

0,87

0,87

0,87

*230

230

1,00

1,2

1,20

0,80

0,80

0,80

230

240

1,10

1,2

1,15

0,90

0,90

0,90

230

260

1,20

1,2

1,00

1,00

1,00

1,00

*400

400

1,00

1,2

1,20

0,80

0,80

0,80

400

440

1,06

1,2

1,10

0,87

0,87

0,87

400

460

1,20

1,2

1,00

1,00

1,00

1,00

400

480

1,25

1,2

1,00

1,10

1,10

1,10

440

440

1,00

1,2

1,20

0,80

0,80

0,80

500

500

1,00

1,2

1,20

0,80

0,80

0,80

500

550

1,06

1,2

1,10

0,87

0,87

0,87

Where you can notice* that a motor winded at 50 Hz can work at 60 Hz with the same rated voltage, power (W), with a 1,2 increase of rpm and rated current in, also a 0,8 reduction of starting current Ia/In, of the starting torque Ca/Cn and of the maximum torque Cmax/Cn.

rpm = r.p.m.

Ia/In = starting current / rated current

Ca/Cn = starting torque / rated torque

Cmax/Cn = maximum torque / rated torque

In = rated current

 

Plate Marking

IE1 = (only 2 and 4 poles, T series)

Volt 230/400/50 Hz

Volt 240/415/50 Hz

Volt 260/440/60 Hz / 1,2 Pn

Volt 280/480/60 Hz / 1,2 Pn

IE2 * =

Volt 230/400/50 Hz / IE2 / 100% / 75% / 50% Pn

Volt 265/460/60 Hz / IE2 / 100% / 75% / 50% Pn

IE3 * =

Volt 230/400/50 Hz / IE3 / 100% / 75% / 50% Pn – Standard

Volt 265/460/60 Hz / IE3 / 100% / 75% / 50% Pn – Upon request

* at only 100% load in the case of small motors due to the limited size of their rating plates

 

Performance and power factor
The table below shows the indicative performance and power factor values based on the operating load.

 

Performance based on load %
Power factor based on load %

5/4

4/4

3/4

2/4

1/4

5/4

4/4

3/4

2/4

1/4

At full load with rated voltage

At full load with rated voltage

90908785800,960,960,920,890,69
89898684790,950,950,910,870,68
88888583780,940,940,900,850,67
87878482770,930,930,890,840,66
86868381760,920,920,880,820,65
85858280750,910,910,870,810,64
84848179740,900,900,860,800,63
83838078730,890,890,850,770,62
82827977720,880,880,840,760,61
81817876710,870,870,830,730,60
80807775700,870,860,820,700,58
79797673690,860,850,810,680,57
78787572680,850,840,800,670,56
77777471670,840,830,790,660,54
76767370660,840,820,770,660,53
75757269640,830,810,760,650,50
74747168630,820,800,750,640,49
73737066620,810,790,740,630,48
72726965600,800,780,730,620,46
71716864590,790,770,720,600,42
70706763580,780,760,700,580,41
69696662590,770,750,690,570,40
68686560570,760,740,680,560,38
67676459560,750,730,670,540,37
66666358550,740,720,660,510,36
65656257540,740,710,650,490,35
64646155520,730,700,630,470,34
63636054510,720,690,620,460,32
62625952500,710,680,610,440,31
60615851490,700,670,600,430,30
59605750480,690,660,580,420,29
58595649460,680,650,570,400,29
57585548450,670,640,550,390,28
56575447430,660,630,540,380,27
55565346420,650,620,510,370,27
53555244410,640,610,500,350,27
52545143400,630,600,480,340,26
51535042390,620,590,460,330,25
50524941370,610,580,450,320,24
49514840360,600,570,430,310,23
48504739350,590,560,410,300,23
47494637330,580,550,400,300,22
46484536320,570,540,390,300,21
44474435310,560,530,380,290,21
43464334300,550,520,370,290,21
42454232290,540,510,370,280,20
41444131270,530,500,370,280,20