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Using Regenerative Converter Units to Recover Over Voltage Energy in AC Drive Systems

From Hitachi America, Ltd. / Industrial Systems Division
 

 

Regeneration occurs in an AC variable frequency drive system when the load overhauls the motor. This can occur when trying to decelerate the load, or when some external force causes the motor to overhaul, causing the motor to act like a generator. The energy contained in the rotating equipment flows into the drive, and is manifested as increased DC bus voltage in the inverter.

Products & Services
AC motor starters are used to turn-on and turn-off electric motors and motor-controlled equipment. They use solid-state or electromechanical technologies, and are designed for single-phase or three-phase motors. Search by Specification | Learn more about AC Motor Starters
Motor starters and contactors are motor-starting devices. They combine a contactor with overload protection and are designed for starting AC or DC motors. Search by Specification | Learn more about Motor Starters and Contactors
AC motor drives interface controllers to AC motors. They match the control signals (voltage and power levels) as well as the signal type (analog or digital). They also provide power conversion, amplification, and the sequencing of waveform signals. Search by Specification | Learn more about AC Motor Drives
Product Announcements
TCI, LLC (Trans-Coil International) - V1k Motor Protection Output Filter
Greatly reduces motor failures. Limits the magnitude of voltage spikes to levels below 1000 V. (read more)
TCI, LLC (Trans-Coil International) - KDR Output Reactor
Output reactors dampen overshoot peak voltage and extend the life of the motor. (read more)
MTE Corporation - Sine Wave filters
New MTE Sine Wave filters provide sine wave output voltage when driven from PWM inverters, eliminating motor insulation failures, reduce EMI and help meet IEEE-519 for cable lengths up to 15,000 feet... (read more)
MTE Corporation - RFI/EMI Filters
MTE Corporation type "RF" filters offer an economical solution to many facility interference problems caused by the high frequency emissions of adjustable speed motor drives and inverters. (read more)
ABB Drives and Motors - ACS800 - Regenerative Drives
The compact, stand-alone regenerative drives, now added to ABB's ACS800 product family, range from 7.5 to 125 horsepower, and offer an extensive selection of features and options... (read more)
Warner Electric - UNIBRAKE® AC Motor Brake from Warner Electric
Warner Electric spring applied motor brakes decelerate or park inertial loads when the voltage is turned off, either intentionally or accidentally. The friction disc with the hub is coupled to the... (read more)
Hitachi America, Ltd. / Industrial Systems Division - X200 Series of inverters
Hitachi America, Ltd., Industrial Systems Division, announced the X200 Series of inverters. The new model builds on the advanced technology of its predecessors while adding many unique enhancements. (read more)
Hitachi America, Ltd. / Industrial Systems Division - SIMPLE TRIP-LESS MICRO AC DRIVES
Hitachi America, Ltd., Industrial Systems Division, announced the X200 Series of inverters. The new model builds on the advanced technology of its predecessors while adding many unique enhancements. (read more)
TCI, LLC (Trans-Coil International) - KLC Motor Protection Output Filter
UL and CUL listed dV/dT Output Filters provide enhanced motor performance and durability. (read more)
 
Topics of Interest
Both regeneration and dynamic braking (DB) slow down a rotating DC motor and its load, but when should one method be chosen over another, or when possibly should both be used? There are significant... (Read More)
What is Regenerative Energy? When a motor turns faster than the commanded speed as set by its AC variable speed drive, the motor in effect acts as a generator. An example of this would be the control... (Read More)
TYPES OF MOTORS Alternating-Current Motors SQUIRREL-CAGE INDUCTION MOTOR  By far the most common motor used to drive pumps is the squirrel-cage induction motor (Figure 1). This motor consists of... (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)
Energy, which is being generated during the braking process of fast rotations or heavy masses, used to be converted into useless heat by means of bulky brake resistors. Today, innovative drive... (Read More)
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