subject: Motor Controllers [print this page] In a commercial production setting, such as in paper or rolling mills, speed control is needed to keep motors running smoothly. Factories that use motors usually have to buy a motor controller to help keep both speed and torque under control during operation. The actual controller is necessary simply because motors rotate at such higher speeds. There are a range of direct and indirect benefits of using a speed control drive.
It permits the control, acceleration and stopping, which reduces device loss that usually results as a consequence of mechanical wear and tear or breakage of the product. Some provide electricity savings due to less horsepower being used during function. Other benefits include an adjustable operating speed and also torque limit, lower energy needed to start, and discounts realized mainly because the need for expensive electro-mechanical drive components might be eliminated. Speed controllers or drives work by finding a signal that represents the needed speed.
Drives that measure the actual speed of the motor are called feedback or closed loop speed controllers. Mainly because motors often differ in design and size, motor controllers are available with various drive outputs. A controller can vary the motor's average voltage by quickly switching the actual motor's supply on and shut off. This particular switch occurs very rapidly for that reason the actual motor will not actually be affected by the change, however just the speed will be affected. A motor's speed is directly related to its supply voltage. For that reason simply reduce the actual voltage to fifty percent the volts will also cut its speed in fifty percent. This basic voltage switching procedure can extend the everyday life of a motor as well as prevent mishaps any time there is operating heavy-duty machinery.
There are several key elements that a controller needs to operate properly. It needs to alter the actual motor's voltage and also to measure the absolute speed of the actual shaft. It also needs software to help keep the actual motor's speed constant despite any type of interference. The actual key to understanding what type of motor controller to use is to learn the types of motors and what they require. The principal types of motors include things like brushed, brushless, uncommulated (homopolar and also ball bearing) and synchronous. It's also critical to find out what types of drives are available.
There are nonregenerative and regenerative drives that support varying ranges of horsepower. One drive might hold several models for flexibility to meet the end user's needs. Look for a motor controller that's affordable and offers multiple options. When you need assistance, several distributors and companies provide one-on-one technical assistance to support the best unit for your own application. You are able to browse brochures, manuals, etc. on-line to get ideas.
by: NW
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