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Introduction :-
Crane and Hoist duty motors from Bharat Bijlee are ideal for frequent
starts / stops and reversing.
They are also used for applications such as materials handling, weirs
and sluices, lifts of all types and auxiliary motors in rolling-mills or
wherever intermittent drives are required.
They conform to IS : 325-for
Three-Phase Induction Motors and IS : 4722 for rotating electrical machines.
The size of the motor is governed by
the mechanical effects of starting and braking functions, the type of control
and the number of switching per hour. The rated output, the number starts
/ hour and the inertia ( i.e. load GD2 + rotor GD2 ) are
interdependent.
Suitable for diverse duties
Rotor type and identification of motors
Motors with Integral Brakes
These motors can be supplied with integral fail safe D.C. brakes in frame
sizes upto 132M with built in rectifiers ( so that no separate supply is
required. ) The braking torque values are :
Frame size : 71 80 90S/L 100L 112M 132S/M
Braking torque Kgm : 0.5 1
2 4 5 or
6 5 or 6
These are of TEFC construction, smaller than the surface cooled motors used conventionally.
Enquiries :
The following information should be included :
a) Application
b) Voltage and frequency + variations.
c) Ambient temperature, and type of protection required.
d) Mounting.
e) No. of starts / stops per hour with duty and CDF.
f) Load GD2 at motor speed.
g) Load Torque; or Torque / Speed curve of driven equipment.
h) Duty cycle diagram, if other other than those described earlier.
ADDITIONAL DETAILS RELATING TO
SLIPRING MOTORS
Application
Slipring motors are used for systems specifying limitations on starting current,
for high inertia drives and for frequent starting. The motors are
eminently suitable for high mechanical and electrical stresses encountered under
heavy duty conditions such as excavating machinery, scrapers and winders,
straightening machines, stone crushers, main and auxiliary drives in rolling
mills etc. These motors are well suited for 'smooth starting' drives
by suitably stepping the starting resistance. They can also be used for
variable speed drives, particularly for short periods and within a small speed
range.
ADDITIONAL MECHANICAL FEATURES
The sliprings at the drive end are
accessible through hinged covers on the top. The brush block assembly can
hence easily be replaced as a whole without dismantling the motor.
The terminal box on top of the motor, contains 6 terminals for stator and 3 for
rotor and 4 cable entries ( 2 on each side as viewed from driven end.)
Cane Unloader Motors
* 300 Starts / Stops Per Hour
* Robust Squirrel Cage Construction
* Replaces Slipring Motors
* Forced Cooling
* Built-In-Thermal Protection
* Minimum Maintenance
* Compact Design,
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