Motor preferred for kiln drives is usually

Motor preferred for kiln drives is usually

Right Answer is:

Any of the above

SOLUTION

Kiln drives: The rotary kiln is an indispensable part of a cement plant. The rotary kiln drives depend upon the type of cement-making process (wet or dry). These are, in general, tubular tilted from the horizontal position with a ring fitted around them. This ring gear engages with one or two pinions. A variable-speed motor drives the pinion.

The requirements of a kiln motor are the following:

  1. Power requirement is very high
  2. The speed control ratio is 1:10. Very low creeping speeds of 1 rpm may be required.
  3. Starting torque should be in the range of 200 to 250% of full load torque.
  4. The acceleration of the drive should be completed in about 15 s.
  5. For small periods an overload capacity of 200-250% may be required.
  6. The motor must have suitable control for inching and spotting during maintenance.

The motors that meet the above requirements are as follows:

  1. A.C. motors with speed control.
  2. Slip ring induction motor.
  3. Ward Leonard controlled the D.C motor.
  4. Three-phased shunt-wound commutator motor.
  5. Cascade controlled A.C. motor.
  6. D.C. motor with transformer step switch control.
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