Cement cooling upgrade

Cooling upgrade for 4,600 kW replacement motor

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

Cooling upgrade for 4,600 kW replacement motor project image

Project overview

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

Challenge

The original high-power motor needed replacement while the site also needed improved cooling margin for hotter operating conditions and long continuous duty.

Solution

The motor package was redesigned around a more capable cooling system while keeping the installation envelope practical for a brownfield replacement.

Outcome

Cooling improved from IC511 to IC516, the frame size reduced from 1250 mm to 900 mm, and the replacement package improved thermal reliability.

Engineering highlights

  • 4,600 kW motor
  • IC511 to IC516 cooling upgrade
  • Frame reduction from 1250 mm to 900 mm
  • Legacy ELIN replacement

Replacement scope

Cooling system enhancementThermal reliabilityEnvelope optimization

Project images

Cooling upgrade for 4,600 kW replacement motor project imageCooling upgrade for 4,600 kW replacement motor project imageCooling upgrade for 4,600 kW replacement motor project image

Related replacement engineering notes

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