A knowledge of Brushless DC electric motor

A brushless DC electric motor (BLDC motor or BL motor), also known as electronically commutated motor (ECM or EC motor) and synchronous DC motors, are synchronous motors powered by direct current (DC) electricity via an inverter or switching power supply which produces electricity in the form of alternating current (AC) to drive each phase of the motor via a closed loop controller. The controller provides pulses of current to the motor windings that control the speed and torque of the motor. This control system replaces the commutator (brushes) used in many conventional electric motors.

The construction of a brushless motor system is typically similar to a permanent magnet synchronous motor (PMSM), but can also be a switched reluctance motor, or an induction (asynchronous) motor. They may also use neodymium magnets and be outrunners (the stator is surrounded by the rotor), inrunners (the rotor is surrounded by the stator), or axial (the rotor and stator are flat and parallel).

The advantages of a brushless motor over brushed motors are high power-to-weight ratio, high speed, electronic control, and low maintenance. Brushless motors find applications in such places as computer peripherals (disk drives, printers), hand-held power tools, and vehicles ranging from model aircraft to automobiles. In modern washing machines, brushless DC motors have allowed replacement of rubber belts and gearboxes by a direct-drive design.

Features of brushless DC motors:

Advantages:

Lack of brushes means long motor life

High-efficiency design

Stability of speed control

Able to operate at high speeds

High startup torque

There is a trend in the heating, ventilation, and air conditioning (HVAC) and refrigeration industries to use brushless motors instead of various types of AC motors. The most significant reason to switch to a brushless motor is the dramatic reduction in power required to operate them versus a typical AC motor.[10] While shaded-pole and permanent split capacitor motors once dominated as the motor of fans, many fans are now run using a brushless motor.[when?] Some fans also use brushless motors in order to increase overall system efficiency.

In addition to the brushless motor's higher efficiency, HVAC systems (especially those featuring variable-speed and/or load modulation) use brushless motors because the built-in microprocessor allows for programmability, control over airflow, and serial communication. Some ceiling fan and portable fans also feature this motor. They advertise the motor being highly energy efficient and quieter than most fans.

Eurostars has successfully developed and researched Brushless DC motors for chilled water fan coil units, including ceiling concealed fan coil, ceiling exposed and floor standing fan coil, ceiling cassette fan coil, high external static pressure duct fan coil, etc., with DC 110V, DC 220. We have brought up plan to develop DC 24V motor for our fan coils in 2021.