2 Engineering
2.11 Three-phase motor
54 DC1 Variable Frequency Drive 04/16 MN04020003Z-EN www.eaton.com
2.11 Three-phase motor
2.11.1 Motor Selection
General recommendations for motor selection:
• Use three-phase induction motors with squirrel-cage rotors and surface
cooling – also referred to as three-phase asynchronous motors or
standard motors. Other types of motors, such as external rotor motors
can also be run with DC1 variable frequency drives, but will normally
require additional engineering, modifying the various parameters, and
detailed information from the motor manufacturer.
• Only use motors that have insulation class F (maximum steady state
temperature of 155 °C ) at least.
• Choose 4 pole motors preferably (synchronous speed: 1500 min
-1
at 50 Hz and 1800 min
-1
at 60 Hz).
• Take the operating conditions into account for S1 operation
(IEC 60034-1).
• Do not oversize the motor, i.e., the motor should not be more than one
rating level higher than the rated motor output.
• In the case of undersized motors, the motor output for continuous
operation should not be more than one rating level lower than the rated
rating level (in order to ensure that the motor will be protected).
• When running tests or commissioning a system with significantly lower
motor outputs, the motor’s rated operational current must be adjusted
using parameter P-08 ("rated motor current").
￫
Check whether the DC1 variable frequency drive you selected
and the AC motor you will be using are compatible with each
other as per the corresponding voltage (mains and motor
voltage) and rated operational current.
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