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The type MPDC drives serve to control DC motors
with external excitation, and to fit them to the technological environment.
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This equipment is manufactured for satisfying
unique needs, first of all for applications in rolling mills.
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A cascade drive can be used advantageously
for the control of the revolution per minute of asynchronous motors
with collector rings.
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In the surface mines, asynchronous motors with
collector rings drive the high power conveyor belts.
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The VHJ Ltd. has developed special microprocessor
controlled exciter units for the excitation and start of synchronous
motors and generators.
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