source:My DrollStanford University researchers have developed a key experimental device for future quantum physics-based technologies that borrows a page from current, everyday mechanical devices.Reliable, compact, durable, and efficient, acoustic devices harness mechanical motion to perform useful tasks. A prime example of such a device is the mechanical oscillator. When displaced by a force—like sound, for instance—components of the device begin moving back-and-forth about their original position. Creating this periodic motion is a handy way to keep time, filter signals, and sense motion in ...
Release time:
2022
-
04
-
25
viewed：3
source:AUTO FUTURESGlobal automotive and industrial supplier Schaeffler has signed a five-year contract with Norwegian company REEtec AS for the purchase of rare earth oxides. The aim is to make electric motors for hybrid modules, hybrid transmissions and all-electric axle drives even more sustainable. Permanent magnets manufactured using rare earth metals, like neodymium, produce optimum magnetic flux in electric motors.In future, the German company will procure these metals from REEtec AS, which uses a sustainable production process.The partnership will begin in 2024.REEtec has been sep...
Release time:
2022
-
04
-
21
viewed：1
source:Electronic DesignHigh power density is an important characteristic in most motors, even in a tiny motor with a high-power-output capability. A high-power-density motor (HPDM) is one that has a high ratio of power/volume.The smallest motors can even have a high power output. HPDMs are low-speed, high-torque motors. These motors are usually lightweight, small, and have large amounts of torque and lower cogging torque. Cogging torque is defined as the torque necessary to overcome an opposing torque that’s created by the magnetic attractive force between the rotor magnets and the stator iro...
Release time:
2022
-
04
-
20
viewed：2
source:solarQuotesPowerful permanent magnets made from Rare Earth Elements (REEs) give us cheaper, lighter and more efficient generators and motors for wind turbines and electric cars.Australia is the world’s 4th largest producer with 8% of REE production. But China is the rare earth element elephant, with 60% of the world’s supply. Their share of production used to be up around 95%, but after trying to hike the price in 2009 other countries — including Australia — started mining for REE. Because China’s attempt to raise prices failed, you might think people would feel relaxed...
Release time:
2022
-
04
-
19
viewed：3