digitalspeedcontrollerpsw05| Application Note
Digital Speed Controller for Embedded High Reliability Applications
By Jay Goetz Sr. Staff FAE International Rectifier High Reliability Products Minnetonka, MN Jgoetz1@irf.com Weiping Hu Design Engineering Manager International Rectifier High Reliability Products Leominster, MA whu1@irf.com Deb Bhattacharyya Sr. Hybrid Electrical Design Engineer International Rectifier High Reliability Products Leominster, MA Dbhatta1@irf.com
As presented at Power Systems World 2005 Abstract Modern "electric platform" based vehicles and aircraft for commercial and military duty are using electric motors in large numbers. The demand for higher efficiency, improved performance, lower noise and smaller controller footprint has led to development of a high reliability motor controller for vector controlled permanent magnet motors. This controller is optimized to act as a design platform, with an interface that maps a comprehensive register set to dozens of drive parameters to allow quick setup and testing. IR's iMotion components are used which are highly integrated yet low cost processors, gate drivers, and feedback electronics, assembled into a relatively small circuit board stack mounted on top of a power substrate. A dedicated hardware processor with embedded pre-configured sinusoidal FOC algorithm supports high reliability applications such as pumps, fans, and compressors. This paper discusses the ease of commissioning the controller starting w
ith basic motor and application parameters; no software is required. This allows the user to quickly create a high performance adjustable speed machine with high starting torque, accurate speed control over a wide 20:1 speed range, and capability of high inverter frequency. Test data from a test stand is given and test data from a pump application is shown. Electric Platforms Require Small Embedded Motor Controllers with Efficient Algorithms Modern Electric Platforms are replacing gear driven auxiliary loads with generator fed electric motors that have POL power conditioning to provide the required motor buses. (5). An example of this is the 787 aircraft which has deleted the bleed-air system traditionally used and replaced it with localized electric motors for such loads as environment control, hydraulic cooling, and APU starting. Another example is the RST-V reconnaissance, surveillance, and targeting vehicle being developed for the US Marines which uses permanent magnet motors for a number of applications
including hub mounted traction drive, electric power steering, and drive-by-wire. An on-board generator for produces 27KW for onboard loads and off board use. Nowadays, system Integrators are being asked more frequently for an electric driven solution which uses permanent magnet motors because of their high torque to amp ratio, efficiency, and improved power factor. Weight is a penalty in transportation, especially in aircraft, which makes thermally efficient hybrid substrate packaging the preferred approach for power electronics. The algorithm used should allow efficient utilization of motor supply voltage and current.
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