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AC and DC Variable Speed Drives: Application Considerations

 

 
How Torque Varies with Speed Under constant volts/hertz conditions, from ¼ to 150% of full load, A-C motors produce torque proportional to stator current, and torque proportional to stator current, and torque output varies with speed demands of the load. In A-C adjustable speed applications, because of their constant torque capabilities, A-C V*S Drives can continuously produce full load torque without overheating over speed ranges dependent upon the type of motor being used. The first graph to the right show the speed-torque profile for A-C V*S Drives using an energy efficient Duty Master XE Motor. The second graph shows this profil can be 20:1 throughout the speed range with special motors designed for adjustable speed operation, such as the Reliance RPM A-C Motor
Products & Services
Adjustable speed drives alter the speed of a driven shaft to a speed selected by an operator. Search by Specification | Learn more about Adjustable Speed Drives
DC servomotors are generally small and powerful for their size, and easy to control. Common types of DC servomotors include brushless or gear motors. Search by Specification | Learn more about DC Servomotors
AC motors include single, multiphase, universal, induction, synchronous, and gear motors. They also include servomotors.   Search by Specification | Learn more about AC Motors
Gearmotors consist of an AC or DC motor with an integral gearbox or gear head that steps delivered speed up or down. Search by Specification | Learn more about Gearmotors
Electrical winding services fabricate custom-wound assemblies for a wide range of applications, including automotive, avionics, motor, transformer, medical instrumentation and power generation applications. Learn more about Electrical Winding Services
Product Announcements
Automationdirect.com - NEW: NEMA Premium AC Motors
AutomationDirect offers a variety of AC motors from ¼-100 Hp. New models offer premium efficiency from 1-100 Hp. These TEFC motors meet or exceed NEMA Premium ratings for reduced power consumption... (read more)
Baldor Electric Company - Variable Speed Motor High Torque to Inertia Ratio
New Reliance™ Finned Laminated Frame RPM™ AC Motor Offers Greater Power Density in a Smaller Frame Size. Engineered to provide increased torque density and more power, the new totally... (read more)
Maxon Precision Motors, Inc. - maxon flat motors with integrated electronics
Brushless DC motors with in-built 1-Q speed controller. maxon motor has launched a range of brushless DC motors with integrated electronics. The range features established drives EC 20 flat, EC 32... (read more)
Automationdirect.com - DURApulse and GS Series AC Drives
-AC variable frequency drives for speed control applications. High quality drives at low prices. DURApulse series sensorless vector AC drives are built on the simplicity & flexibility of the GS1... (read more)
Topics of Interest
Protection and Ratings Motor Protection The typical method of starting a three-phase induction motor is by connecting the motor directly across the power line. Line starting a motor is done with a... (Read More)
AC and DC motors are the two major types in use today that are related to the industrial and HVAC applications. These motors provide the speed, torque, and horsepower necessary to operate the... (Read More)
Control of Speed, Torque, and Horsepower Control of Speed The speed of a squirrel cage motor depends on the frequency and the number of poles for which the motor is wound. The higher the frequency,... (Read More)
AC Motor Types Introduction AC motors can be divided into two major categories-asynchronous and synchronous. The induction motor is probably the most common type of asynchronous motor (meaning speed... (Read More)
PERFORMANCE Ac induction motors are designed to produce their rated power at a certain speed at a specific line voltage, line frequency, and ambient temperature. These motors will also operate at a... (Read More)
See more product announcements for Adjustable Speed Drives
Cyclo 6000 Speed Reducers & Gearmotors

Cyclo 6000 Speed Reducers & Gearmotors
Sumitomo Machinery Corp. of America


High Efficiency Gear Drives: Waste Water Treatment

High Efficiency Gear Drives: Waste Water Treatment
Sumitomo Machinery Corp. of America


Helical Shaft Mount Speed Reducer

Helical Shaft Mount Speed Reducer
Sumitomo Machinery Corp. of America


11 See more product announcements for Adjustable Speed Drives