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Electromagnetic clutches and brakes operate electrically, but transmit torque mechanically. This is why they used to be referred to as electro-mechanical clutches or brakes. Over the years, EM became known as electromagnetic versus electro mechanical, referring more about their actuation method versus physical operation. Since the clutches started becoming popular over 60 years ago, the variety of applications and brake and clutch designs has increased dramatically, but the basic operation remains the same. This article is about the working principles of single face friction plate clutches and brakes. In this article, clutches and brakes are referred to as (mechanical) couplings. ==Construction== A horseshoe magnet (A-1) has a north and south pole. If a piece of carbon steel contacts both poles, a magnetic circuit is created. In an electromagnetic coupling, the north and south pole is created by a coil shell and a wound coil. Image:A-1 horseshoe-magnet-red-silver-iron-filings-AHD.jpg|A-1 Horseshoe magnet Image:B-1 electromagnetic-clutch1.gif|B-1 Electromagnetic clutch Image:A-2 Ogura VCEH clutch.jpg|A-2 Ogura Industrial Typical 2 pole clutch Image:A-4 triple flux clutch.jpg|A-4 Triple flux clutch Image:A-6 Double Flux.JPG|A-6 Double Flux clutch Image:A-7 Triple flux rotor with banana slots and bridges.jpg|A-7 Triple flux rotor with banana slots and bridges File:A-3_electromagnetic-brake1.png|A-3 Electromagnetic brake 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Friction-plate electromagnetic couplings」の詳細全文を読む スポンサード リンク
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