Cement applications

Cement plants depend on rotary equipment operating under dust, heat, vibration, and continuous duty.

Recovered case material includes ABB, VEM, Elin, and slip-ring motor replacement projects with high efficiency and harsh ambient requirements.

Kiln drives
ID fans
Cement mills
Feeders

Relevant case studies

Cooling upgrade for 4,600 kW replacement motor

An ELIN motor replacement was redesigned with an upgraded cooling system while preserving the installation envelope.

Open Case Study

Torque and speed-curve matched replacement

A replacement motor design was matched against the original speed-torque behavior and driven-machine load curve.

Open Case Study

Engineering notes for this sector

PAM two-speed controlled-flow operation

Pole Amplitude Modulation motors provide two fixed speeds from a single winding, helping pumps and fans reduce energy use without a full variable-frequency package.

Single-winding, two-speed squirrel cage construction
Oil-filled five-pole speed-changing switch is typically installed close to the motor
Lower-speed starting reduces inrush current and thermal stress

Load-sharing replacement motors

When two motors drive one machine in parallel, replacing one motor requires tight matching of electrical and mechanical behavior so load sharing remains stable.

Match torque curve, speed slip, efficiency, inertia, cooling, and starting behavior
Preserve shaft height, shaft end, feet, terminal box, and coupling interface
Relevant to HPGR, mills, pumps, fans, compressors, and other paired-drive systems

Cooling system enhancement

Aging motors often need improved cooling to handle hotter ambient conditions and longer duty cycles while preserving the existing mounting envelope.

Review cooling path, airflow, heat exchanger selection, and cooling class
Improve thermal margin without changing the foundation, coupling, or terminal arrangement
Recovered example: 4,600 kW motor cooling upgraded from IC511 to IC516 while frame size reduced from 1250 mm to 900 mm

Identical terminal-box replacement

Replacement motors can be designed with identical main and auxiliary terminal boxes to avoid site cable, terminal, and commissioning changes.

Match dimensions, cable connections, and terminal locations
Reduce shutdown risk during commissioning
Especially useful in brownfield replacements where cable routing is fixed

Torque and speed-curve matching

Replacement designs must consider existing load curves, starting current, and speed-torque behavior so the new motor remains compatible with the driven machine.

Match original speed-torque curve and starting behavior
Reduce inrush current where possible
Keep adequate torque safety factor during network voltage drop and soft-start operation

VFD-compatible motor replacement

VFD-compatible motors require review of the original drive design, harmonic effects, insulation stress, and the ability to operate without changing existing drive settings.

Account for THD and high-voltage spike insulation stress
Use motor and VFD design data during replacement engineering
Witness testing can simulate real operating conditions and load

DC-to-AC conversion

Old DC motors can be replaced with AC motors and VFDs when output characteristics are matched to protect the driven machine and process.

Match output characteristics of the existing DC motor
Maintain dimensional and mechanical interfaces
Requires direct access to experienced motor and drive design teams

Spare-parts inventory continuity

Replacement motors can be designed around existing spare-parts inventories to reduce stock duplication and maintenance cost.

Consider existing bearings, sleeve bearings, carbon brushes, and other maintained components
Useful for large plants with high-value motor spares already in stock
Supports long-term maintenance continuity