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Cut power, improve performance with brushless DC motors

Posted: 25 Aug 2009     Print Version  Bookmark and Share

Keywords:brushless DC motors  motors PMSM  efficiency performance 

The European sales market forecast for integral horsepower (750W and above) motors is dominated by AC motors. Sales of these motors represent 96 per cent (or over 9 million) of all units sold, of which 87 per cent consists of 3-phase AC induction motors.

The market for efficient motors in the EU has seen a significant transformation and demand, following the introduction of the CEMEP/EU agreement, where the lowest efficient motor of the three classifications have since been virtually withdrawn from the market.

As a result, brushless DC (BLDC) and permanent magnet synchronous motors (PMSM) are technologies that have seen an increase in demand, because of high efficiency and increasingly cheaper production cost. These types of motors are expected to gain market importance in the low power range 750W to 5kW particularly.

There is pressure therefore on designers to cut the cost of motor installation, including the control systems, and this is where more efficient low-cost microcontrollers can help. Understanding the requirements, however, can help illustrate what features control circuit designers need to focus on to get the best performance for the smallest investment in silicon.

Furthermore, modular software blocks and hardware reference designs offer fast motor control solutions. The core motor control software routines are proven and remain the same, independent of the motor size, so applications including white goods through to major industrial installations can be driven by the same core device.

View the PDF document for more information.

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