Design Considerations For High-Speed Three-Phase PMSM Motor Drives For Consumer Home Appliances
by Lei Han, Infineon Technologies Americas, El Segundo, Calif., How2Power Today, Nov 15 2023
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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