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  • Drives
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Drives and Motor Controllers

A motor controller is a device or group of devices that serves to govern, in a predetermined manner, the performance of an electric motor. A motor controller may include a manual or automatic means for starting and stopping the motor, selecting forward or reverse rotation, selecting and regulating the speed, regulating or limiting the torque, and protecting against overloads and faults.

Every electric motor must have some kind of controller. The motor controller will have differing features and complexity depending on the task the motor will be performing.
 
The simplest case is a switch to connect a motor to a power source, such as in small appliances or power tools. The switch may be manually operated, may be a relay, or a contactor connected to some form of sensor that can automatically start and stop the motor. The switch may have several positions to select different connections of the motor. This may allow reduced-voltage starting of the motor, reversing control or selection of multiple speeds. Overload and overcurrent protection may be omitted in very small motor controllers which rely on the supplying circuit to have overcurrent protection. Small motors may have built-in overload devices to automatically open the circuit on overload. Larger motors have a protective overload relay or temperature sensing relay included in the controller and fuses or circuit breakers for overcurrent protection. An automatic motor controller may also include limit switches or other devices to protect the driven machinery.
 
More complex motor controllers may be used to accurately control the speed and torque of the connected motor (or motors) and may be part of closed loop control systems for precise positioning of a driven machine. For example, a numerically controlled lathe will accurately position the cutting tool according to a preprogrammed profile and compensate for varying load conditions and perturbing forces to maintain tool position.

Select one of the tabs above to learn more about your particular drive technology.

 


 

Servo Drive

A servo drive is a special electronic amplifier used to power electric servo motors. It monitors feedback signals from the motor and continually adjusts for deviation from expected behavior.

Function
A servo drive receives a command signal from a control system, amplifies the signal, and transmits electric current to a servo motor in order to produce motion proportional to the command signal. Typically, the command signal represents a desired velocity, but can also represent a desired torque or position. A velocity sensor attached to the servo motor reports the motor's actual velocity back to the servo drive. The servo drive then compares the actual motor velocity with the commanded motor velocity and alters the voltage frequency to the motor so as to correct for any error in the velocity.


In a properly configured system, the servo motor rotates at a velocity that very closely approximates the velocity signal being received by the servo drive from the control system. Several parameters, such as stiffness (also known as proportional gain), damping (also known as derivative gain), and feedback gain, can be adjusted to achieve this desired performance. The process of adjusting these parameters is called tuning.
 
Although many servomotors require a drive specific to that particular motor brand or model, many drives are now available that are compatible with a wide variety of motors.

Alternate names for Servo drives could be: Brushless Servo Drive, AC Servo Drive, DC Servo Drive, Amp Drive, Amplifier, Linear Electrical Servo Drive, Hydraulic Servo Drive, Analog Servo Drive, Digital Servo Drive, Trapezoidal Servo Drive, Sinusoidal Servo Drive, AC Feedback Drive

REA Technologies is an expert in servo drive repair. Below is a list of Servo Drive manufacturers that we are familiar with. If yours is not listed, please call us, we will be able to help you.


AAD GE FANUC OSAI
ABB GEC ALSTHOM PA INDUSTRIES
ABSO SERVO GENERAL ELECTRIC PACIFIC SCIENTIFIC
ACCUDRIVE GENERAL MOTION PANASONIC
ACTUS POWER GENERIC CABLE PARAJUST
ADVANCED MOTION GERBER TECHNOLOGY INC PARKER
ADVANCED VECTOR SERVO GETTYS PARKER AAD
AEROTECH GETTYS MODICON PARKER COLORFLOW
ALLEN BRADLEY GIDDINGS & LEWIS PARKER DAEDAL
ALSTHOM INTERNATIONAL GEC GL GEIJER ELECTR PARKER DIGIPLAN
ALSTOM GLENTEK PARKER FLUID CONNECTORS
AMERICAN PRECISION GLOBAL SYSTEM GROUP PARKER FLUID POWER
AMK GOLD LINE PARKER HANNIFIN
AMKASYN GOULD & STATHAM PARKER HAUSER
ANAHEIM AUTOMATION GOULD GETTYS PARKER HYDRAULIC VALVE DIV
ANDERSON GREENWOOD GOULD MODICON PARVEX
ANDERSON INSTRUMENT GROSSENBACHER PERMA DRIVE
API CONTROLS GROUPE SCHNEIDER PHYTRON
APPALACHIAN HAAS PMI MOTION
APPLIED MOTION PRODUCTS HAMAC PRIMA
ASEA BROWN BOVERI HANNIFIN RANDTRONICS
ASR SERVOTRON HARMONIC DRIVE RELIANCE ELECTRIC
ATLAS HARMONIC DRIVE TECH REXROTH
ATLAS COPCO HARMONIC INC REXROTH INDRAMAT
AUTOMATION DIRECT HAUSER ROBBINS MEYERS
AUTOMOTION HD SYSTEMS RORZE
AXOR HELDT & ROSSI SAMSUNG
B&R HITACHI SANYO
BALDOR HIWIN MICROSYSTEMS SANYO DENKI
BALDOR MOTION PRODUCTS HURCO MFG CO SBC MOTOVARIATORI
BASLER ELECTRIC HYDRAULIC VALVE DIVISION SCHELLENBERG
BAUMULLER IMEC SCHNEIDER AUTOMATION INC
BAUTZ IMS SELCA
BEARING ENGINEERS INDRAMAT SERVO DYNAMICS
BECKHOFF INDUSTRIAL DEVICES SERVO SYSTEMTECHNIK
BEHR INDUSTRIAL DRIVES SERVOMATE
BERGER LAHR INDUSTRIAL INDEXING SEW EURODRIVE
BERNECKER & RAINER INDUSTRIAL INDEXING SYSTEMS SHIBAURA
BONITRON INFRANOR SHINKO
BOSCH INLAND MOTOR SIEB & MEYER
BYSTRONIC INMOTION SIEMENS
CARLO GAVAZZI INTELLIGENT MOTION SYSTEMS SIEMENS BUILDING TECHNOLOGIES
CDS IRT SIMPLATROL
CEGELEC ITD SKIL BOSCH
CENTENT JETTER SMC
CINCINNATI MILACRON JOHNSON YOKOGAWA SMITEC
CLEVELAND CONTROLS JORDAN CONTROLS SOCAPEL
CLEVELAND ELECTRIC KEB COMBIVERT SOPREL
CLEVELAND KIDDER KEBCO SPERRY VICKERS
CLEVELAND MACHINE KENWAY SQUARE D
CLEVELAND MOTION CONTROL KOFU MEIDENSHA STAR AUTOMATION
CMC KOLLMORGEN STAR SEIKI
CMC RANDTRONICS KOLLMORGEN IND STEGMANN
COLORFLOW KOLLMORGEN SEIDEL STOBER
COMPUMOTOR KOYO STROMAG
CONTRAVES KUKA SUPERIOR ELECTRIC
CONTROL PRODUCTS LEDEX SWEO ENGINEERING
CONTROL TECHNIQUES LENZE TAE
COOPER LUCAS LEDEX TAMAGAWA
COOPER GARDNER DENVER LUST ELECTRONICS TDE
COPLEY CONTROLS MAC DRIVES TECNO ELETTRONICA
CP SERVO MAESTRO TEIJIN SEIKI
CROWN MAGNETEK TEKNIC
CUSTOM SERVO MAN ROLAND TELEMECANIQUE
CUTLER HAMMER MARQUIP THOMPSON
DAEDAL MARSH THOMSON INDUSTRIES
DANAHER CONTROLS MARSHALLTOWN INSTRUMENTS TOA ELECTRIC CO
DANAHER MOTION MATSUSHITA ELECTRIC TOEI ELECTRIC
DANFOSS MATTKE TOL O MATIC
DELTA OHM MAZAK TOOL O MATIC
DELTA TAU DATA SYS MEIDENSHA TOSHIBA
DELTADRIVE MELEC TOYODA
DIGIPLAN MESA TREE MACHINE TOOL
DIRECT LOGIC MIKI PULLEY TSUDAKOMA
DOOSAN MITSUBISHI TYCO
DYNASERV MODICON UNICO
DYNAX MODICON GETTYS UNIDATA
EATON CORPORATION MOOG UNIDRIVE
EATON KENWAY MOTION CONTROL DEVICES UNITED TECHNOLOGIES
EG&G MOTION SCIENCE USD PROD
ELAU AG MOTOMAN ROBOTICS VEXTA
ELECTRO CRAFT MOTORREGLER VEXTRA
ELGE MTS AUTOMATION VICKERS
ELMO MOTION CONTROL MTS SYSTEMS CO WACO GIKEN
ELWOOD CORPORATION MYCOM WARNER ELECTRIC
EMERSON NACHI WER INDUSTRIAL
EMERSON PROCESS MANAGEMENT NAIS WESTAMP INC
ESR NATIONAL INSTRUMENT WESTERN SERVO
EURODRIVE NEC WHEDCO
EUROTHERM DRIVES NIKKI DENSO WIRE ELECTRONIC
FAE NIPPON WORLD SERVO
FANUC NIPPON SEIKO YASKAWA DENKI SEISAKUSHO
FLUID POWER DIVISION NOVOTRON YASKAWA ELECTRIC
FORMAX NSK YOKOGAWA
FOXBORO NUM
FUJI ELECTRIC OKUMA
G&L ELECTRONICS OMRON
GALIL MOTION CONTROLS OMTRON
GALILDMC ORIENTAL MOTOR
GARDNER DENVER ORMEC

 

 

Spindle Drives

Spindle Drives are highly reliable AC vector controlled inverter drives. These drives are designed for controlling high speed, and compact AC motors used in machine tool spindle drive applications.

Machine tool spindle drives require one of the most demanding motion solutions.
Ripple or velocity errors leave their mark, literally, on the work pieces being machined.

Repairing damaged spindle drives is one of REA Technologies' specialties.

Some other names for Spindle drives are Asynchronous Spindle Drive, Synchronous Spindle Drive, AC Spindle Drive, DC Spindle Drive, Brushless Spindle Drive, Torque Drive

REA Technologies is an expert in spindle drive repair. Below is a list of Spindle Drive manufacturers that we are familiar with. If yours is not listed, please call us, we will be able to help you.


ALLEN BRADLEY INGERSOLL RAND
BOSCH INLAND MOTOR
CALEX KEB COMBIVERT
CHAMP KEBCO
CINCINNATI LAMB KOLLMORGEN IND
CINCINNATI MILACRON MITSUBISHI
CMC RANDTRONICS OKUMA
DANAHER MOTION PHOTOSWITCH
FANUC RELIANCE ELECTRIC
FENNER REXROTH INDRAMAT
FUJI ELECTRIC SIEMENS
GENERAL ELECTRIC SIEMENS BUILDING TECHNOLOGIES
GENERAL MOTION SIOUX
GRASEBY VOLKMANN SKIL BOSCH
HAMAC YASKAWA ELECTRIC
INDRAMAT

 

 

Soft Start Drives

A motor soft starter is a device used with AC electric motors to temporarily reduce the load and torque in the powertrain of the motor during startup. This reduces the mechanical stress on the motor and shaft, as well as the electrodynamic stresses on the attached power cables and electrical distribution network. A soft start drive can extend the lifespan of the motor system.
 
Motor soft starters can consist of mechanical or electrical devices, or a combination of both. Mechanical soft starters include clutches and several types of couplings using fluid, magnetic forces, or steel shot to transmit torque, similar to other forms of torque limiter. Electrical soft starters can be any control system that reduces the torque by temporarily reducing the voltage or current input. It my also be a device that temporarily alters how the motor is connected in the electric circuit.
 
Electrical soft starters can use solid state devices to control the current flow, and therefore, the voltage applied to the motor. They can be connected in series with the line voltage applied to the motor, or can be connected inside the delta (Δ) loop of a delta-connected motor, which controls the voltage applied to each winding. Solid state soft starters can control one or more phases of the voltage applied to the induction motor with the best results achieved by three-phase control. Typically, the voltage is controlled by reverse-parallel-connected silicon-controlled rectifiers (thyristors), however in some circumstances, with a three-phase control, the control elements can be a reverse-parallel-connected SCR and diode.

Below is a list of Soft Start Drive manufacturers that we are familiar with. If yours is not listed, please call us, we will be able to help you.


ABB EATON CORPORATION
ACCO BABCOCK INC ELECTRO MATIC
ACCO BRISTOL ELECTROMATIC
ALLEN BRADLEY EMERSON
AMBITECH IND EXCELON
AMTECH FINCOR
ANGELUS FURNAS ELECTRIC CO
ASCO GENERAL ELECTRIC
ASEA BROWN BOVERI GRASEBY CONTROLS
BALDOR GROUPE SCHNEIDER
BALDOR MOTION PRODUCTS KLOCKNER MOELLER
BEEL CONTROLS MAGNETEK
BELLOWS MOELLER ELECTRIC
BENSHAW MOSIER NORGREN
BOSCH MOTORTRONICS
BOSTON NORDIC CONTROLS
CARLO GAVAZZI NORGREN
CONTROL METHODS NUMATICS
CRYDOM OMRON
CUTLER HAMMER ORIENTAL MOTOR
DANFOSS PARAJUST
DIAMOND SYSTEMS


 

Vector Drives

Phase vector drives (or simply vector drives) are an improvement over variable frequency drives (VFDs) in that they separate the calculations of magnetizing current and torque generating current. These quantities are represented by phase vectors and are combined to produce the driving phase vector which in turn is decomposed into the driving components of the output stage. These calculations require a fast microprocessor, typically a DSP device.


Unlike a VFD, a vector drive is a closed loop system. It takes feedback on rotor position and phase currents. Rotor position can be obtained through an encoder, but is often sensed by the reverse EMF generated on the motor leads.

In some configurations, a vector drive may be able to generate full rated motor torque at zero speed.

Some alternate names for vector drives include: AC Vector Drive, DC Vector Drive, Open Loop Vector Drive, Closed Loop Vector Drive, Sensorless Vector Drive

REA Technologies is an expert in vector drive repair. Below is a list of Vector Drive manufacturers that we are familiar with. If yours is not listed, please call us, we will be able to help you.


BALDOR
BALDOR MOTION PRODUCTS
CONTROL TECHNIQUES
EMERSON
EMERSON PROCESS MANAGEMENT
INDRAMAT
KLOCKNER MOELLER
MOELLER ELECTRIC
MITSUBISHI
POWER ELECTRONICS
REXROTH INDRAMAT
UNIDRIVE
WER INDUSTRIAL

 

 

Inverter Drives

An inverter is an electrical device that converts direct current (DC) to alternating current (AC). The converted AC can be at any required voltage and frequency with the use of appropriate transformers, switching, and control circuits.

Solid-state inverters have no moving parts and are used in a wide range of applications, from small switching power supplies in computers, to large electric utility high-voltage direct current applications that transport bulk power. Inverters are commonly used to supply AC power from DC sources such as solar panels or batteries.
 
There are two main types of inverter. The output of a modified sine wave inverter is similar to a square wave output except that the output goes to zero volts for a time before switching positive or negative. It is simple and low cost (~$0.10USD/Watt) and is compatible with most electronic devices, except for sensitive or specialized equipment, for example certain laser printers. A pure sine wave inverter produces a nearly perfect sine wave output (<3% total harmonic distortion) that is essentially the same as utility-supplied grid power. Thus, it is compatible with all AC electronic devices. This is the type used in grid-tie inverters. Its design is more complex, and costs 5 or 10 times more per unit power (~$0.50 to $1.00USD/Watt). The electrical inverter is a high-power electronic oscillator. It is so named because early mechanical AC to DC converters were made to work in reverse, and thus were "inverted", to convert DC to AC.

The inverter performs the opposite function of a rectifier.

Some common alternate names for Inverters are: Variable Frequency Drive (VFD), Adjustable Frequency Drive (AFD), Variable Voltage Variable Frequency Drive (VVVFD), Single Phase Variable Frequency Drive, Frequency Drive, AC Drive, Variable Speed Drive (VSD), Adjustable Speed Drive (ASD), Synchronous Drive, Asynchronous Drive, Continously Variable Transmission Drive (CVT), Eddy Current Drive, Regenerative Variable Frequency Drive, AC Induction Drive, AC Pole Number Control Drive

REA Technologies is an expert in Inverter drive repair. Below is a list of Soft Start Drive manufacturers that we are familiar with. If yours is not listed, please call us, we will be able to help you.


21 CENTURY FOX LOCHINVAR
ABB MAGNETEK
AC TECHNOLOGY MANNESMANN DEMAG
ALLEN BRADLEY MANSFIELD & GREEN
ALPHA WIRE MITSUBISHI
AMERICAN POWER CONVERSION MOTORTRONICS
AMETEK NEC
APC NEDERMAN
ASEA BROWN BOVERI OMRON
ASTEC AMERICA PARAJUST
AZTEC PARKER
BALDOR PAYNE ENGINEERING
BALDOR MOTION PRODUCTS PENTA POWER
BK PRECISION RELIANCE ELECTRIC
BODINE ELECTRIC SABINA ELECTRIC
BOSTON SAFETRONICS
BOSTON GEAR SAFTRONICS
CONTROL TECHNIQUES SCHNEIDER AUTOMATION INC
CUTLER HAMMER SEW EURODRIVE
DAYTON SIEMENS
EATON CORPORATION SIEMENS BUILDING TECHNOLOGIES
ELEKTRIM SMC
EMERSON STATPOWER
EMERSON PROCESS MANAGEMENT SUMITOMO MACHINERY INC
EURODRIVE TB WOODS
EUROTHERM DRIVES TECO
FUJI ELECTRIC TECO WESTINGHOUSE
GENESIS TELEMECANIQUE
GRAINGER TOPAZ
GROUPE SCHNEIDER TOSHIBA
HEYNAU TRANE
HITACHI TRIPP LITE
IDM CONTROLS UNIDRIVE
KB ELECTRONICS WER INDUSTRIAL
LEESON ELECTRIC CO WILMORE
LENZE WOODS
LG INDUSTRIAL SYSTEMS XANTREX
LOCHINAVAR YASKAWA ELECTRIC

 

 

DC Drives

A DC drive is a motor control unit that controls a DC motor. DC drives consist of an SCR (Silicon Controlled Rectifier) bridge, which converts incoming three or single-phase AC volts to DC volts.  Using this conversion process, DC drives can regulate speed, torque, voltage and current conditions of the DC motor. This is ideal for industrial processes such as tube mills, extruders, mixers, paper machines and various other controlled applications.

Some common alternate names for DC Drives are: Brushless DC Drive, Linear Drive, DC Servo Drive, PWM Drive, BEMF Drive, Voltage Control Drive, 3 Phase DC Drive, Analog DC Drive, Digital DC Drive

Below is a list of DC Drive manufacturers that we are familiar with. If yours is not listed, please call us, we will be able to help you.


ABB KEB COMBIVERT
ACRISON KEBCO
AEROTECH KEYENCE CORP
AKRON STANDARD KLOCKNER MOELLER
ALLEN BRADLEY KOLLMORGEN IND
B&B MOTOR & CONTROL LANTECH
BALDOR LEESON ELECTRIC CO
BALDOR MOTION PRODUCTS LENZE
BARDAC LOUIS ALLIS
BAUER MAGNETEK
BAUMULLER MAGPOWR
BEEL CONTROLS MANSFIELD & GREEN
BELL & HOWELL MELLTRONICS
BERGER LAHR MINARIK ELECTRIC CO
BK PRECISION MITSUBISHI
BODINE ELECTRIC MODICON GETTYS
BOMAC MOELLER ELECTRIC
BORG WARNER MONARCH INSTRUMENTS
BOSTON MOTION INDUSTRIES
BOSTON GEAR MTE
BRIDGEPORT MULLER MARTINI
BRONCO MULTILIN
BROWNING NORDAC
BROWNING MFG OEM CONTROLS INC
BRUCKE ON LINE POWER INC
BURTON ORIENTAL MOTOR
CAMCO OSDA
CARATRON PACIFIC SCIENTIFIC
CAROTRON PARAJUST
CDS PARAMETRICS
CHEMCUT PARKER
CHESHIRE PENTA POWER
CINCINNATI MILACRON PERMA DRIVE
CLARK CONTROL PHEONIX
CLARK EQUIPMENT PHOENIX CONTACT
CLEVELAND CONTROLS PHOENIX KLEMMEN
CLEVELAND ELECTRIC PILZ
CLEVELAND KIDDER PMD
CLEVELAND MACHINE POLYSPEDE
CLEVELAND MOTION CONTROL POWERTEC INDUSTRIAL MOTORS INC
CMC PROSYS
CMC RANDTRONICS RANDTRONICS
COELIND RAYTRON
COMPUMOTOR RED LION CONTROLS
CONTRAVES REGOLAZIONE ELECTRIC
CONTREX RELIANCE ELECTRIC
CONTROL TECHNIQUES RETA ELECTRONIC
CRUSADER REXROTH INDRAMAT
CURTIS ROBICON
CURTIS ALBRIGHT ROCKWELL INTL CORP
CURTIS INDUSTRIES RONDO MOTOR CONTROL
CURTIS INSTRUMENTS RYCO
CURTIS MACHINE S&S ELECTRIC
CURTIS TOLEDO SABINA ELECTRIC
CURTIS UNIVERSAL JOINT SAFETRONICS
CURTISS WRIGHT SAFTRONICS
DAHLGREN SCHNEIDER AUTOMATION INC
DANAGRAF SECO
DANAHER CONTROLS SECO DRIVES
DANAHER MOTION SEW EURODRIVE
DANFOSS SHINKO
DART CONTROLS SHINKO ELECTRIC
DAYTON SIEI
DUPONT SIEMENS
ELECTRO FLYTE SIEMENS BUILDING TECHNOLOGIES
EMERSON SIGMA PACIFIC SCIENTIFIC
EMERSON PROCESS MANAGEMENT SKALTEK
EUROTHERM CONTROLS SKIL BOSCH
EUROTHERM DRIVES SMT
FENNER SOLICON
FINCOR SOUTHCON IND CONTROLS
GOULD GENERIC SPRECHER & SCHUH
GRAHAM SPRINT ELECTRIC
GRAINGER SRE
HALMAR SSD DRIVES
HAMAC STATPOWER
HAMMOND SUNDSTRAND
HAMPDEN SUPERFLOW
HAMPTON PRODUCTS SUPERIOR ELECTRIC
HARLAND SIMON SWEO ENGINEERING
HARREL TASC DRIVES
HARRIS TB WOODS
HEYNAU TBI BAILEY
HIRATA TELEMECANIQUE
HITACHI TRACO ELECTRIC
H-TRONIC TROY ENTERPRISE
IMEC TURCK ELEKTRONIK
IMS UNIDRIVE
INDRAMAT VACON
INDUSTRIAL DEVICES VEXTA
INDUSTRIAL INDEXING WARNER ELECTRIC
INGERSOLL RAND WEBER
INLAND MOTOR WER INDUSTRIAL
INTELLIGENT MOTION SYSTEMS WESTINGHOUSE
ITD WHEDCO
JOSLYN CLARK WHITE WESTINGHOUSE
JOST WILMORE
K TRON WOODS
KALEJA WOODWARD
KB ELECTRONICS WPI
KEARNEY & TRECKER YASKAWA ELECTRIC
ZENITH PUMPS

 

Stepper Drives

A Stepper drive is a special type of motor controller that contains feedback technology to allow it to control the discrete movement of a Stepper Motor.

Some alternate names for Stepper Drives include: Stepper Motor Drive, Half Step Drive, Bipolar Stepper Drive, Unipolar Stepper Drive, Micro-stepping Drive

REA Technologies is an expert in stepper drive repair. Below is a list of Stepper Drive manufacturers that we are familiar with. If yours is not listed, please call us, we will be able to help you.


APPLIED INTELLIGENT MOTION SYSTEMS
AMERICAN PRECISION KLIKLOK
API CONTROLS LABEL AIRE
Applied NATIONAL INSTRUMENT
APPLIED MOTION PRODUCTS ORIENTAL MOTOR
COMPUMOTOR PACIFIC SCIENTIFIC
DANAHER MOTION PARKER
FESTO ELECTRIC PHASE II
IMEC SIGMA PACIFIC SCIENTIFIC
IMS STOEGRA
INDUSTRIAL DEVICES SUPERIOR ELECTRIC
WARNER ELECTRIC

 

 


All Rights Reserved, REA Technologies, Inc. 2551 US Hwy 70, Connelly Springs, NC 28612 (828) 397-6050
The designated brand names and trademarks described on this website are the property of their respective owners.


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