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April 5, 2023 cool electronics

Priced at $99, the Fitbit confirmed that wearables might be affordable. The unique Palm Pilot 1000 solidified handheld computing when it launched in 1996, paving the finest way for BlackBerry and, ultimately, today’s smartphone. The “palm top” laptop (get it?) came with a monochrome touchscreen that supported handwriting and was able to syncing information like contacts and calendar entries to users’ computers. It spawned a device class known as the “personal digital assistant,” or PDA. It wasn’t the primary such device—the Apple Newton preceded it—but it was the first one people wished and bought in droves.

The IC includes all the analog circuits needed to measure the motor winding currents and the input ac currents and voltages. But Hall-Effect sensors cannot be used inside hermetically sealed compressors. The various is to detect the zero-crossing of the again EMF on the unconnected winding in a so-called “sensorless” method. The sensorless method estimates the rotor magnet position based on winding current measurements. This permits utility of field-oriented management ideas to align the stator current magnetic axis 90° forward of the rotor magnet axis and so maximize torque manufacturing. Hall-Effect sensors usually detect the rotor magnet place to select the right windings throughout …