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MOTOR INFORMATION
REFERENCE INFORMATION
© FANTECH
2016
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STANDARD MOTORS (Cont.)
SPEED CONTROL
Certain sizes of single and three-phase motors are suitable for variable speed control. If
the fan is controlled by a variable speed drive, the installation must be compliant with
CISPR14.1:2003 to satisfy EMC compliances.
BEARINGS
Unless otherwise nominated, all fans are fitted with ball or roller bearings. The bearing
housing of motors up to frame size D132 as a minimum, are fully enclosed, sealed-for-
life and therefore do not require maintenance.
Bearings are pre-packed with grease and, under normal circumstances, last for several
years.
Larger frame sizes are fitted with lubrication nipples. When these motors are fitted to
axial flow fans, lubricators, extended to the outside of the fan casing to facilitate
lubrication, are fitted. Grease relief valves must be fitted when extended lubrications are
fitted.
ELECTRICAL SUPPLY
Motors are generally wound for 415V/3ph/50Hz or 220-240V/1ph/50Hz, however, we
can provide motors wound for all voltage and frequency variations.
INSULATION
Insulation to Class F with Class B temperature rise is used throughout, allowing for
operation in ambients up to +40°C. Motors for higher temperatures can be provided
upon request.
TROPIC-PROOFING
Tropic-proofing consists of an anti-fungal treatment of the windings. Further
modifications may be necessary for high humidity applications.
MULTI-SPEED MOTORS
Many applications require the maximum design conditions for only relatively short time
periods, resulting in a waste of energy and consequently, a high running cost. To
overcome this, fans can be supplied with 2-speed motors.
Using this method, power savings can be substantial, as well as generating much lower
noise levels.
THERMAL PROTECTION
Thermal protection in the form of thermistors can be incorporated in any of the squirrel
cage induction motors on request.
Thermistor overloads must be used in conjunction with these motors.
HIGH TEMPERATURE
APPLICATIONS
When continuous operation in higher ambients is essential, the motor can be wound
with Class H insulation.
The maximum continuous ambient temperature for Class H insulation is:-
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Class H - 80ºC
The above figure is a guide only as the maximum ambient depends upon the load
being applied to the motor and the temperature rise of the motor.
If in doubt, refer to our sales office.
SMOKE-SPILL APPLICATIONS
Refer to page
C-8.