Taming Unstable Servos  

Oleh:

Schick, Marcus

Jenis: Article from Bulletin/Magazine - ilmiah internasional
Dalam koleksi: Machine Design (Soft Copy ada dalam http://search.proquest.com/) vol. 83 no. 11 (Jun. 2011), page 53-60.
Topik: Engineers; Motors; Motion Control; Machinery Industry

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Perpustakaan Pusat (Semanggi) Nomor Panggil: MM44 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Most engineers can remember sitting through classes in control theory, when the main topic was how to avoid instability. The problem with these classroom discussions is they tend to be abstract. In the real world, instability is a physical phenomenon. Instability in a speed-controlled motor system is a case in point. It is actually caused by uncontrolled and unintended motion at the motor shaft. It can happen at low or high frequencies, with the higher frequencies often becoming audible (usually a growling sound). This sort of instability comes from excessive gain in the speed controller of the drive. There are several factors that can contribute to the likelihood of a drive experiencing instability. Besides excessive gain in speed controller, they include use of a lower-resolution feedback device on motor; and gearing backlash and mechanical decoupling of the load from the motor. Reducing gain or implementing adaptive gain in the speed controller is probably the most common way of attacking instability.

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