ABB ACS250 VFDAlternating current VFD drive technology extends the motor speed range from zero to high above the rated speed of an electric motor, increasing the productivity of the driven process. When a low capacity is enough, the vfdreduces the machine speed and saves energy.

VFD equipmentall over the world save energy in applications for pumps, fans, conveyors and machines. The ABB ACS250 VFD drives provide flexible mounting alternatives and straightforward configuration and they are very easy to install and setup.The ABB ACS250 VFD is part of ABB’s complete micro drive range, which offers a solution for every application. The ABB ACS250 VFD can be used for simple to more complex machines. ABB ACS250 VFD enclosure sizes are available inIP20 series, in power ratings from single phase 110 – 120 Volt; for low power applications, such as pumps, fans, grinders, mixers and conveyors, through 600 Volt drives with more advanced features for general purpose applications.

The ABB ACS250 VFD is available in an IP66 enclosure in a full range of products for harsh environments. IP66 enclosed drives are ideal for wash-down applications and the offering covers all the voltages from 1-phase 110 Volt, to 3-phase 600 Volt.All ABB ACS250 VFD drives include a built-in Modbus-RTU serial communication, intuitive keypad control, and build-in macrostomake commissioning straightforward. IP66 enclosures are available with or without switch featuring a speed pot, FWD -0.REW and power isolator. In 500 – 600 Volt ABB ACS250 VFD advanced product types, the additional features include e.g. CAN open interface and built-in safe-torque-off (STO) function.

The ABB ACS250 VFD with IP66/NEMA 4X enclosure is designed for applications such as; screws, mixers, pumps, fans and conveyors, which are installed in harsh environments containingdust, moisture and cleaning chemicals. The Nema 4X drives design and ease of setup benet a broad range of industries.The Nema 4X drive was designed with bacteriaresistant materials, meeting stringenthygiene requirements, and the Nema 4X integratedkeypad provides straightforward drivecommissioning and maintenance inextreme environments. The drivessealed ABS enclosure and corrosionresistant heat sink are ideal for wash downapplications.

To learn more about the ABB ACS250 VFD, or for Repair and Replacement Quotes, contact Precision Electric, Inc.




Permanent Magnet Servo Motors

Permanent Magnet Servo Motors

Permanent magnet servo motors are also known as brushless servo motors and/or PM (permanent magnet) servo motors. Permanent magnet servo motors are used when an industrial application requires high performance and precise speed regulation. Permanent magnet servo motors are manufactured with a designated controller known as a servo drive or servo driver. Permanent magnet servo motors use position feedback to precisely regulate motor control by being paired with an encoder. Encoders measure a brushless servo motor’soutput shaft position which is compared to the command position. When the servo motor output shaft doesn’t match the demand signal, an error signal is sent to the servo motor controller; the controller adjusts accordingly and sends a signal back to the servo motor until the demand position is met. PM servo controllers (servo drive, driver, etc.) are never included in the base price of the servo motor. Servo motor systems can be expensive but the cost is justified with optimal manufacturing processes via precise speed regulation.

Servo motors output more torque than brushed direct current motors. Brushless servo motors aren’t as loud during operation than brushed direct current servo motors. The lifespan of brushless servo motors exceeds than that of a brushed direct current motor because there aren’t brushes or a commutator to maintain. The idea behind brushless servo motors was to be able to integrate control function of the servo motor with industrial electronic components and personal computers; and to precisely position machines in manufacturing processes. Some manufacturers use brushless servo motors in explosive and dirty environments because brushless servo motors are entirely closed and sealed to prevent dust or sparks to reach the servo motor parts.

Permanent Magnet Servo Motor Design Process

Permanent Magnet Servo MotorsThis process comprises threemain steps: Electromagnetic, structural and thermal designs. Electromagnetic design startswith magnetic circuit modeling and parameter optimization with a given set of designspecifications. A series of optimizations such as pole number, loading, current density,dimensional limits etc. have to be performed to find the optimum parameters of the motorbefore proceeding further. When a design is obtained that meets the technical spec, a quickmotor simulation and the influence of parameter variation must be carried out usingsimulation software such as SPEED (PC-BDC Manual, 2002). A detailed electromagneticfinite element analysis (FEA) either in 2D or 3D is the next step to verify that the designmeets the specified torque-speed characteristics and performance. After an electromagneticdesign is finalized, structural and thermal analyses (MotorCAD Manual 2004) have to becompleted. Structural analysis is not a necessity for design on low speed permanent magnet servo motors. If motor does not meet the structural or thermal tests, then theelectromagnetic design study should be repeated for a better design.

Permanent magnet servo motors are widely used in many industrial applications for theirsmall size, higher efficiency, noise-free operation, high speed range and better control. Thismakes quality of their torque an important issue in wide range of applications includingservo applications. For example, permanent magnet servo motors used in defense applications, robotics, servosystems, electric vehicles all require smooth torque operation.One of the most important issues in PM servo motors is the pulsating torque componentwhich is inherent in motor design. If a quality work is not completed during the designstage, this component can lead to mechanical vibrations, acoustic noise, shorter life anddrive system problems. In addition, if precautions are not taken, it can lead to seriouscontrol issues especially at low speeds. Minimization of the pulsating torque components isof great importance in the design of permanent magnet servo motors.In general, calculation of torque quality is a demanding task since the torque qualitycalculation does not only consider the torque density of the motor but also consider thepulsating torque component. Therefore, a mathematical approach about torque qualityshould include harmonic analysis of electric drive system rather than a simple sizing of the motor.

To learn more about permanent magnet servo motors or for servo motor repair and replacement quotes, contact Precision Electric, Inc.












Eaton VFD Repair

Eaton VFD Repair

Eaton VFD repair is an asset to Sullair service centers because Eaton VFD replacement isexpensive and longlead times for Eaton drives are a common problem. Sullair service centers often send their Eaton VFD repair to Precision Electric to increase production in the plant.Precision Electric service technicians have hundreds of years combined experience in bench testing components for Eaton VFD repair. Precision Electric uses the most advanced equipment for Eaton VFD repair, and Precision Electric replaces damaged components with better components than the Original Equipment Manufacturer uses.

Eaton VFD drives provide Sullair aircompressor applications with high speed output frequency up to 7200 Hz.Eaton variable frequency drivesautomatically identify motor parameters in sensorless vector mode as well as U/f mode, which keeps track of parameter changes over time. Eaton drivesallow for steady speed error, fast torque rise time, high immunity to resonance vibrations and high torque upon start up.

Minimizing Downtime Via Eaton VFD Repair

Eaton VFD RepairPrecision Electric repairs all Eaton Cutler Hammer variable frequency drives in house to ensure maximum efficiency and competitive repair costs. Since Precision Electric performs all Eaton VFD repair in house,customer downtime is greatly minimized sincethe equipment is not handled by anyone other than Precision Electric and the customer. Precision Electric also offers Eaton VFD repair in the field for equipment that needs troubleshooting on site.

Precision Electric offers 24/7 emergency repair services for Eaton drive users who do not have spare equipment on hand.Precision Electric recommends all manufacturers keep spare Eaton drives for crucial production lines, because keeping a spare Eaton drive willmaximize production when the primary Eaton drive fails. If a spare Eaton drive is not available for the manufacturer when the primary drive fails, production downtime usually exceeds the cost of a spare Eaton drive by far.

Precision Electric offers routine maintenance for Eaton VFD repair to provide manufacturing facilities with optimal production and to prevent emergency or rush repair services on Eaton equipment. Precision Electric routine maintenance consists of removing all parts of an Eaton drive, cleaning parts and all other components, replacement of damaged components, final testing of all electrical components, assembly of Eaton drive, final test of Eaton drive with electric motor, and safely packaging for delivery back to the customer. All repair work performed by Precision Electric includesa 12 month in service warranty. The in service warranty begins the exact day the Eaton drive is put into production, and ends 12 months later.

To learn more about Eaton VFD repair or for Eaton repair and replacement quotes, contact Precision Electric.