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Groschopp announces AC Motor-Control combo with chassis enclosures
Groschopp, Inc. is currently setting apart its AC motor-control combo by implementing strategic compatibility design measures. When matched with Groschopp motors and gearmotors, the DA1225K-0 and...
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FAQ: What is V/Hz control mode for AC drives?
AC motors are commonly paired with variable frequency drives (VFDs), which control motor speed by regulating the frequency of the supplied voltage. Depending on the application and level of speed...
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FAQ: When are closed-loop and open-loop vector control useful?
AC drives have historically been controlled by a scalar method known as volts per hertz (V/Hz), in which the drive maintains a constant voltage-to-frequency ratio in order to maintain stable torque...
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FAQ: What are regenerative drives and where are they used?
The main purpose of a motor is to convert electrical energy into mechanical energy. But when the motor’s synchronous speed is less than the rotor speed, the motor acts like a generator and converts...
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FAQ: What is dynamic braking and when is it used?
When a motor is in an overhauling condition—that is, the load is moving faster than the designated motor speed—the motor acts as a generator and produces electrical energy from mechanical energy. This...
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What is a rectifier?
When considering AC motors, you might think that since they operate on alternating current, they can use power directly from the power grid. But this is not the case. Electrical networks produce AC...
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FAQ: What is a VFD line reactor?
Image credit: KEB America Inc. Many of the components that make up a variable frequency drive (VFD) are semiconductor components, which are sensitive to power or current surges, voltage spikes, line...
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What are VFD reflected waves and why are they harmful?
Reflected waves, also known as transmission line effects or standing waves, are over-voltages that can damage the motor and cable. The use of IGBTs (insulated gate bipolar transistors) in variable...
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FAQ: How does EU Regulation 428/2009 apply to AC drives?
The Control Techniques Unidrive M product range is limited to 550 Hz. AC drives capable of operating at frequencies of 600 Hz or greater are generally referred to as “high-frequency” drives. These...
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FAQ: What are current source inverters and voltage source inverters?
As we’ve discussed before, the main components of a variable frequency drive (VFD) are a rectifier (also referred to as a converter), which converts AC voltage to DC voltage, a DC bus (also referred to...
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FAQ: When to use a DC drive vs an AC flux-vector drive
DC drives are known for their ability to provide tight speed control and full torque at any speed, whereas traditional AC drives had a more narrow speed range and limited torque control. But newer AC...
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FAQ: How to use servo drives with asynchronous (induction) motors?
By Craig Dahlquist • Application Engineer at Lenze Americas || With high construction costs of rare earth permanent magnet synchronous servo motors, asynchronous (induction) motors are more acceptable,...
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AutomationDirect adds more premium efficiency IronHorse AC motors
AutomationDirect’s IronHorse line of general-purpose three-phase motors now includes the MTRP-series 56HC-frame premium efficiency motors available from 1 to 3 hp. The rolled steel motors are available...
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FAQ: How do drives affect cogging in AC motors?
If you put two magnets in close proximity to each other, you know that they’ll experience an attractive force when opposite poles are near each other and a repulsive force when like poles are near. If...
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Lafert high-performance standalone (HPS) permanent-magnet ac motors boost...
HPS Series permanent magnet (PM) synchronous ac motors from Lafert North America deliver IE4 Super Premium energy efficiency while reducing motor size and weight by 50% in some cases. HPS Series motors...
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FAQ: What are medium voltage AC drives, and where are they used?
Recall that the basic equation for electric power is P = VI, or, power = voltage multiplied by current. This means that for a given power level, voltage and current are inversely proportional. In other...
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What are low voltage AC drives and why should you use them?
Despite the benefits of using medium voltage AC drives for high horsepower motors, low voltage technology holds a dominant place in the AC drive market, for both low- and high-power applications. There...
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FAQ: How are PID parameters configured for variable frequency drives?
Using proportional-integral-derivative (PID) control with variable frequency drives (VFDs) is common when a process set point—such as temperature, pressure, flow, or speed—needs to be precisely...
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Trends in electric motors 2017 part one: Market shifts towards smart solutions
This year in motor design there’s been an uptick in three trends. Disposable medical devices, new consumer products, and the automation of humbler tasks are driving demand for affordable and...
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Lafert displays integrated industry and Automation 4.0 at Hannover Messe
Hannover Messe 2017 is currently running through 28 April in Germany — with more than 250,000 visitors and 6,500 exhibitors from numerous industrial sectors. “We’ll present the new generation of IE3...
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