Field-oriented control delivers improved servo speed and efficiencyInmoco is providing greater motor efficiency and higher top-end speed performance for brushless DC servo motors with the launch of the MC73110 Motor Control IC from Performance Motion Devices, Inc. (PMD). Employing highly efficient field- orientated control, the intelligent single- axis MC73110 requires only a MOSFET or IGBT three-phase bridge to implement a fully-featured drive. It is ideal for use in applications such as medical automation, semiconductor equipment, general automation and scientific instrumentation.
The MC73110 provides high performance digital current loop, velocity loop, and commutation for brushless DC motors. It operates in internal velocity profile mode, velocity mode with an external velocity command signal, or torque mode with an external torque command signal. Importantly for users, the MC73110 can be operated standalone, using pre-programmed parameters, or via serial commands as a programmable axis controller.
Key to the ability of the MC73110 to provide greater motor efficiency, and higher top-end rotation speed than alternate methods, is the IC's field- oriented control. This is a math-intensive technique for commutating motors which delivers improvements over standard Hall-based approaches, and gives a speed advantage over sinusoidal commutation in brushless DC motor systems. Field oriented control also offers a significant improvement over standard variable speed drive techniques.
Integrating an on-chip A/D converter, the MC73110 digitises analogue current feedback and provides multiple current control methods to maximise motor performance. In addition to field oriented control, the MC73110 can also perform Hall-based and sinusoidal commutation. Other features include PID velocity loop, PI current loop compensation, trajectory generation, encoder input, and Hall sensor input. Analogue or digital command input, profile generation, and six-signal symmetric PWM (pulse width modulated) waveform generation are also standard.
The MC73110 is supported by the DK73110 Developer's Kit. A complete motion control development tool, this integrated board and software package allows designers to evaluate and use PMD's Motor Control IC, while shortening the design time for engineers who are interested in building high-performance brushless DC motor controllers. The MC73110 Developer's Kit provides the user with a platform with which an application can be developed, motors can be tested, and software can be verified. To create a complete functioning motion system, only a 3-phase brushless motor is required.
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