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Pulse-Width Modulating (PWM) variable-frequency drive projects started in the 1960s at Strömberg in Finland. Martti Harmoinen is regarded as the inventor of this technology. [8] [9] [10] Strömberg managed to sell the idea of PWM drive to Helsinki Metro in 1973 and in 1982 the first PWM drive SAMI10 were operational. [11] [12] [13]
Inovance (Chinese: 汇川技术; pinyin: Huìchuān Jìshù) is a publicly listed Chinese company that engages in the manufacture and sale of electrical equipment that includes industrial automation control products and robotics.
In vector control, an AC induction or synchronous motor is controlled under all operating conditions like a separately excited DC motor. [21] That is, the AC motor behaves like a DC motor in which the field flux linkage and armature flux linkage created by the respective field and armature (or torque component) currents are orthogonally aligned such that, when torque is controlled, the field ...
A variable-speed drive (VSD) air compressor is an air compressor that takes advantage of variable-speed drive technology. This type of compressor uses a special drive to control the speed of the unit, which in turn saves energy compared to a fixed speed equivalent. [1]
VFD may refer to: Government ... Volunteer fire department; Technology. Vacuum fluorescent display; Variable-frequency drive, on electric motors;
When changing VFD frequency in standard low-performance variable-torque applications using Volt-per-Hertz (V/Hz) control, the AC motor's voltage-to-frequency ratio can be maintained constant, and its power can be varied, between the minimum and maximum operating frequencies up to a base frequency. Constant voltage operation above base frequency ...
Welding robot by Yaskawa Robot with two arms SDA5, 2009. The Yaskawa Electric Corporation (株式会社安川電機, Kabushiki-gaisha Yasukawa Denki) is a Japanese manufacturer of servos, motion controllers, AC motor drives, switches and industrial robots.
A VFD operates on the principle of cathodoluminescence, roughly similar to a cathode-ray tube, but operating at much lower voltages. Each tube in a VFD has a phosphor-coated carbon anode that is bombarded by electrons emitted from the cathode filament. [1] [2] In fact, each tube in a VFD is a triode vacuum tube because it also has a mesh ...
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