2 Engineering
2.9 Three-phase motor
54 DA1 Variable Frequency Drives 11/16 MN04020005Z-EN www.eaton.com
2.9 Three-phase motor
2.9.1 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,
wound rotor motors, reluctance motors, permanent magnet motors,
synchronous motors, and servomotors can also be run with DA1 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 should not be more
than one rating level lower than the rated rating level (in order to ensure
that the motor will be protected).
For significantly lower motor outputs, the "frequency control (V/Hz)"
operating mode must be set (P4-01 = 2).
￫
Check whether the DA1 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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