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Squirrel Cage Induction Motors Inroduction
Bharat Bihjlee make Crane and Hoist duty motors are ideally suitable for short time and intermittent duties. These motors are specially designed for frequent starts/stops and reversals.
Major Applications
These motors are widely usedin follwing appliation:
- Crane duty and Hoist duty application including LT and CT handling.
- Material handling
- Weirs and sluices
- Lift duty
- Auxiliary mortors in rolling mills
Product Range
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Frame Size
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Kw Range
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71 to 355L
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0.37 to 400
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Standards In General these motors conform to following standards
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IS 325
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Three-phase induction motors specification
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IS 4722
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Rotating electrical machines
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IS 1231
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Dimensions of foot mounted A.C. Induction
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IS 2223
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Dimensions of flange mounted A.C. Induction motors
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CE Marks All motors have CE marking on the nameplate.
Electrical Features
Operating conditions
Supply conditions (voltage & Frequency)
- Voltage: 415 +10%
- Frequency: 50Hz +5%
- Combined Variation: +10%
Ambient Motors are designed for ambient temperature 45oC. Altitude
Motors are designed for altitude up to 1000m above mean sea level.
Re-rating Factors
The re-rating applicable under different conditions of ambient and altitude are obtained by multiplying follwin factors.
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Amb. Temp. oC
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Permissible output as % of rated value
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<30
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107
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30-40
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100
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50
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96
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55
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92
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60
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87
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Altitude above sea level m
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Permissible output as % of rated value
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1000
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100
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1500
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97
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2000
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94
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2500
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90
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3000
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86
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3500
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82
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4000
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77
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Insulation
The motors are provided with class F insulation scheme with temperature rise limited to class B limits.
Winding
The stators are wound with modified polyester enamel covered (Temp class 155oC) copper wires and impregnated with class F varnish. However motors wound with dual coated copper wires and VPI can be provided on request.
All Motors in 315S frame & above are wound with dual coated winding wire (thermal class 200oC) and all impregnated with VPI process.
Thermal Protection (for winding & bearing)
PTC thermisters/thermostats/RTDs etc. can be embedded in stators winding on request.
In case of frame sizes 250M & above bearing temperature detectors (BTD) can be supplied on request.
Earthing Terminals
Two earting terminals are provided, one on the body and other in the terminal box.
Anti-condensation method
In order to avoid condensation of water inside the motors they can be heated up by connecting 4% to 10% of rated voltage to the motor terminals. Adequate heating is obtained with current equal to 20-25% of rated motor current. Alternatively any method as indicated in IS:900 for heating the stator winding could be adopted. Motors can be offered with built in space heaters in frame sizes 90S and above.
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Phone : 91-120-4357892
