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Examoogle • User • info@examoogle.com • EE-2024-8821
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The drive which is used for metal-cutting machines tools, rolling mills etc. are
Individual drive
None of these
Multimotor drive
Group Drive
Multimotor drive
Quick Summary: A multimotor drive is used in heavy industrial applications where different parts of a machine tool or rolling mill require separate motors for independent control of speed, torque, and synchronization. This approach allows for higher precision and efficiency compared to group drives or single-motor systems in complex mechanical processes.
A multimotor drive is used in heavy industrial applications where different parts of a machine tool or rolling mill require separate motors for independent control of speed, torque, and synchronization. This approach allows for higher precision and efficiency compared to group drives or single-motor systems in complex mechanical processes.
Ptotal=∑i=1nPi — total power requirement is the summation of individual motor ratings.
Tload=Jdtdω+Bω+TL — dynamics of an individual motor-load shaft.
In a multimotor drive system, multiple electric motors are deployed to operate different sections of a manufacturing machine (e.g., feed motor, spindle motor, and coolant pump in a CNC machine). Each motor is controlled by a dedicated power electronic drive or controller (like a VFD or Servo Drive), which allows for coordinated motion control and independent acceleration or deceleration profiles as required by the process load.
Independent control of different segments of the machine.
Higher efficiency due to absence of mechanical power transmission losses (belts, pulleys).
Essential for complex sequence operations like in paper mills or rolling mills.
Provides flexibility for varying load requirements on different machine parts.
Flexible speed and torque control for individual parts.
High reliability; failure of one motor does not necessarily halt the entire process.
Eliminates line shafting and mechanical transmission losses.
Higher initial cost due to multiple motors and controllers.
Increased complexity in control circuitry and wiring.
Requires complex synchronization systems for multi-motor tracking.
Rolling Mills
Paper Mills
CNC Machine Tools
Printing Presses
Individual drive: Single motor for a single machine tool.
Group drive: One motor drives multiple machines via a line shaft and belts (rarely used now due to high losses).
Multimotor drive: Multiple motors for a single complex machine.
C is correct — Multimotor drives are essential for metal-cutting tools and rolling mills to provide independent, precise control for various mechanical components of the system.
Always relate the drive type to the mechanical load requirement; rolling mills require high torque at varying speeds, making individual motor control (Multimotor) necessary for dynamic performance.