Design Considerations For High-Speed Three-Phase PMSM Motor Drives For Consumer Home Appliances

Focus:

Today motor drives for applications like high-performance cordless vacuum cleaners, hair dryers and leaf blowers demand ultra-high-speed performance, often exceeding 100,000 RPM. In each case, designers face a common challenge—producing a compact, lightweight product that balances the needs of battery-operation and efficiency with low total cost for the solution. While the technical requirements seem to call for the use of wide-bandgap semiconductors, the combination of highly-integrated digital motor control ICs, precise gate drivers and silicon-based switches can produce a cost-effective solution, while still meeting performance requirements. This point is illustrated in discussion of three challenging areas faced by designers of high-speed motor control drives: deadtime effect and optimal deadtime selection, control-loop design optimization and accommodations for power-dip-ride-through situations. The causes of these design challenges and techniques for addressing them are explained. Design examples illustrate the concepts.

What you’ll learn:

• How to limit deadtime-induced distortion in motor drive currents
• How to optimize motor control loop design through accurate current sensing and compensation of delays and other factors
• How to understand the source of input power dips, their impact on current and speed loops, and a control algorithm that reduces their effects

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Author & Publication:

Lei Han, Infineon Technologies Americas, El Segundo, Calif., How2Power Today, Nov 15 2023

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