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WEG MOTORS FOR VFD APPLICATIONS - CRITERIA
(Not applicable to motors rated for use in Division 1 hazardous areas. In such cases please contact WEG)
Valid for TEFC NEMA Premium
®
& IEC Tru-Metric - W22 Platforms and ODP
INSULATION SYSTEM AND BEARING CRITERIA
(If any of the conditions below are not met, VFD line filters must be used)
INSULATION SYSTEMS (for all NEMA frame sizes - from 143 to 589 and IEC frame sizes - from 90 to 355) - up to 690 V
Rated Voltage
Feature
Voltage Spikes
motor terminals
(maximum)
dV/dt inverter terminals
(maximum)
Rise Time inverter
terminals
(minimum)
MTBP
Minimum Time
Between Pulse
V
rated
≤ 460 V
Standard Insulation
≤2000 V
≤5200 V/μs
≥0,1 μs
≥6 μs
460 V < V
rated
≤ 575 V
Reinforced Insulation
≤2000 V
≤6500 V/μs
BEARING PROTECTION (for all rated voltage ranges)
NEMA Frame Size
Feature
Frame ≤449
· Optional: Insulated NDE endbell / insulated bearing
L449T – 589
Insulated NDE endbell standard L449 and above. Optional: insulated bearing (*)
Shaft grounding recommended where insulated bearings are applied
IEC Frame Size
Feature
Frame ≤315
· Optional: Insulated NDE endbell / insulated bearing
315L – 355
Insulated NDE endbell standard 315L and above. Optional: insulated bearing (*)
Shaft grounding recommended where insulated bearings are applied
(*) For insulated bearing, please contact WEG
TORQUE CRITERIA - Valid for 2, 4, 6 and 8 pole motors
NEMA PREMIUM
®
EFFICIENCY / IEC MOTORS - TEFC MOTORS
Frame Size
Constant Torque
Variable Torque
143 – 586/7 / 90 – 355
(1)
20:1 / 12:1
1000:1
586/7 / 355
(2)
6:1 / 2:1
1000:1 / 10:1
Satisfactory motor performance depends on proper drive setup - please contact WEG.
(1)
For 250 HP / 185 kW or lower power motors. Also valid for 449 / 315 frames.
(2)
For motors higher than 250 HP / 185 kW.
HIGH EFFICIENCY AND NEMA PREMIUM
®
EFFICIENCY - ODP MOTORS
Frame Size
Constant Torque
Variable Torque
182T – 364/5T
4:1
1000:1
404/5T – 5010T
2:1
1000:1
NOTES:
. Maximum recommended Inverter switching frequency of 5 kHz (minimum of 2.5 kHz)
. The speed ranges stated above are related to the motor thermal capacity only to 60HZ operated motors
. NEMA Premium
®
Efficiency WEG motors of all frame sizes can also be blower cooled under request. In such case, the motor will
be suitable for variable and constant torque applications rated up to 1000:1
. NEMA Premium
®
Efficiency WEG motors comply with those maximum safe operating speeds established in NEMA MG1-2016,
part 30 (consult table 30-1)
. Per IEC standard 60034-18-41:
- Exceed severe IVIC (**) level phase to ground - > 2392
- Exceed moderate IVIC (**) level phase to phase - > 2563
(**) Impulse Voltage Insulation Class