What is a Brushless DC Motor Controller?

In the realm of automation technology, a brushless DC motor controller – also known as a position controller – finds application in precisely guiding and monitoring one or more axes within a machine. These positions are handled sequentially, meaning that the subsequent processing step occurs only after the previous target position has been accurately reached.

The brushless DC motor controller oversees the positioning process, transitioning from one position to another or a sequence of positioning actions based on a path diagram. Hence, it is also referred to as feedforward control or path program control.

Utilising rapid counter inputs designed for incremental or absolute encoders, the brushless DC motor controller detects the current position and speed of the respective axis. It then employs this information alongside the target position to calculate the control deviation, a concept known as motion control. A brushless DC motor controller can encompass a wide array of additional functionalities, such as message reception, generation, and processing, position value handling, and travel range limit monitoring.

These axes can be actuated through electrical, pneumatic, or hydraulic means. The most prevalent approach involves governing servomotors or stepper motors. In scenarios involving multiple axes, a primary intelligent control unit typically assumes the role of coordination, communicating with lower-level systems through a standardised interface, typically field- or Ethernet-based bus systems.

A standalone version can independently manage entire single-axis systems through self-created sequence programs, eliminating the need for a primary intelligent control unit. Positioning controllers can be independent devices, integrated as hardware or software modules within a PLC, or integrated into the control software of actuators or drive controllers. The control can take the form of point control or a significantly more intricate spatial path control.

When combined with Rotalink motors, brushless DC motor controllers deliver precision drive systems capable of executing highly dynamic movements.

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