Permanent Magnet Synchronous Motor (PMSM) Fan Coil Unit (FCU) (REF:C-0013)
E&M InnoPortal Trial Project Ref. No.:

Overview

This project aims to review the energy efficiency and reliability performance of Permanent Magnet Synchronous Motor (PMSM) fan coil units (FCU), in comparison to conventional single-phase induction motors (SPIM) typically used in FCUs. There were instantaneous and continuous power consumption measurements to compare the performance of SPIM and PMSM FCU when they were operating in parallel.

Problem Addressed

Traditionally, SPIMs are the predominant type of motors used for FCUs. Typical FCUs are designed for operation in multiple speeds (high-medium-low), which exhibit considerable efficiency decreases at lower speeds, resulting in suboptimal energy usage. Additionally, the lifespan of SPIMs' bearings is relatively short, around 3 years only. This project is to address these issues by using a new design, PMSM FCUs which offer improved efficiency through lower operating temperatures of the bearings, resulting in a longer bearing lifespan of about 8 years.
Innovation

PMSM FCU has higher efficiency and longer life span than the traditional SPIM FCU. The Permanent Magnet Synchronous Motor (PMSM) is highly responsive due to the lack of "slip", providing consistent torque across a broad speed range. This leads to a reduction in rotor inertia and an increase in dynamics.
Key Benefits
  • Reduces electricity consumption by FCU motors by 50% and 70% at high and low speed operations respectively compared with SPIMs
  • PMSM life span is about 8 years
  • Ready for connection to thermostats featuring three-speed control, or 0 to 10V stepless control
  • Ready for Internet-of-Things (IoT) connection or direct connection with building management systems
Project Reference

Electrical and Mechanical Services Department Headquarters