Inverter duty motors are designed for optimized performance to run with variable frequency drive. Industrial electric motors are available for most general purpose applications and processes. Also, operating motors for an extended time at low motor rpm. Oct 14, 2010 general purpose ac motors have been around for many years. Inverter duty motor terminology a subsidiary of regalbeloit corporation 4 ap111, 701 c. Assuming you are referring to a 230 volt motor, there is no drawback. The inverter duty motors have independent cooling fan to cool down motor. Inverter duty threephase ac gear motors and speed control motors.
I know that you can use inverter duty motor with 10. Yet, they possess a basic drawback by way of being not able to control speed. Inverters were originally sold to be used with standard motors, but an increasing failure rate for inverterfed motors led to the introduction of motors for inverter duty. Bison gear and engineering designs and manufactures a full line of standard and custom inverter duty ac gearmotors. Also, the duty cycle will remain the same until the next timer1 overflow occurs, as shown in figure 5. Additionally, the ac invertervector motors can be ran across the line for bypass operation and can deliver a. Apart from many other specific design considerations, inverter duty motors are provided with special insulation system to withstand voltage stresses imposed. The modular design of our motors consists of a foot mounted nema motor, and a c face drive end and accessory c face. What are the drawbacks to using a regular motor with a vfd.
Motor rerating factor due to ambient temperature and altitude is indicated in the motor selection chart. What is the difference between an inverter duty and a regular motor. I know vfd variable frequency drive operating range for positive displacement pumps. An inverter duty motor is a much newer concept that became necessary as motors began to be driven by vfds inverters or ac drives.
The motors available from stock range in size from hp to 500 hp. Inverter duty also sometimes listed as inverter ready means even more extras are built in. An inverterduty motor can withstand the higher voltage spikes producted by all vfds and can run at very slow speeds without overheating. Inverter duty and vector duty describe a class of ac induction motors that are specifically designed for use with frequency inverter. An inverterduty motor is a much newer concept that was necessary as general purpose motors began to be driven by vfds inverters or ac drives. When i worked for a motor manufacturer we would use obsolete noninverter duty motors with vfds in the engineering lab or on manufacturing equipment all the time. These motors can be used without additional filters or load reactors provided that voltage overshoots do not exceed the upper limit at the motor terminals. Power from the electrical supply goes into the drive. Some applications require the motor and control to be separated by distance. Electric motors for inverter duty castiron casing technical characteristics the motors included in this series are normally used for spindles, lathes, grinders, milling cutters, conveyors, roller ways, pumps and centrifugal fans, in the textile industry, etc. A510 heavy duty drive 1200 hp 460v 1100 hp 230v lcd keypad that is remotely mountable diagnostic registers for troubleshooting enhanced design for smoother and quieter motor operation multiple control modes for general or heavy duty applications. Vf control of 3phase induction motors using pic16f7x7. Motors designed for fixedspeed operation are often used, however, elevated voltage stresses imposed on fixed speed induction motors to control speed and torque by varying motor input frequency and voltage require a higher than normal insulation class. We had already spent the money on noninverter duty standard motor, since it was scrap anyway we used it.
The wound motor poles are then dipped in premium varnish and baked. Standard motor drived by vhf premature failure the inverter duty motors most whitstand the fast rise time pulses and capacitive voltage potencial,the insulation and wire most be special in order to avoid p. Maybe you have walked past without noticing them or maybe you know exactly how many you have, either way electric motors play an important role in our everyday lives which most of us are unaware of but, they move and run most things we need for business and pleasure. How an inverter drive works and controls the speed of. General purpose ac motors have been around for many years. Inverter duty motor reuland variable speed, inverter duty motors are available in both open loop and closed loop designs. Apart from many other specific design considerations, inverter duty motors are provided with special insulation system to withstand voltage stresses imposed by igbt based drives comprising of the following. The electricity sent to the motor is a very clean true sine wave at 60hz. Marathon u759 general purpose motor, 3 phase inverter duty 10. Example of inverter duty motor name plate once the continuous current and peak current required for the motor have been determined, select a drive with output current ratings that meet or exceed that level. However, some ac variable speed applications require constant torque at zero speed. General purpose motors have been around for many years.
As the name implies, inverter duty refers to a gearmotor whose speed is controlled by an inverter, or vfd variable frequency drive. An inverter duty motor is a much newer concept that became necessary as motors began to be driven by variable frequency drives. How an inverter drive works and controls the speed of an ac induction motor an inverter drive vfd works by taking ac mains single or three phase and first rectifying it into dc, the dc is usually smoothed with capacitors and often a dc choke before it is connected to a network of power transistors to turn it into three phases for the. As the name implies, inverterduty refers to a gearmotor whose speed is controlled by an inverter, or vfd variable frequency drive. This design feature shortens delivery time and can be furnished with a variety of options, including encoders and brakes. View profile view forum posts diamond join date jun 2001 location st louis posts 18,272 post thanks like. Peak torque is the maximum amount of torque a baldor series h2 inverter or vector drive can produce. It can operate for wide speed range without any heating problem. This may be limited by the breakdown torque of the motor or the controls currentlimited peak torque. The wound motor poles are then dipped in premium varnish and baked repeatedly. Ours are sometimes called ac drives, variable speed drive vsd or variable frequency drives vfd.
Inverter duty motor on variable frequency drive an inverter duty motor can deal with the higher voltage spikes produced by vfds also can run at very slow speeds without overheating. Motor space heaters when present are to be connected and energized whenever there is a possibility that the storage ambient conditions will reach the dew point. Three phase general purpose industrial electric motors for. Vhz, open or closed loop vector builtin modbus communications. The inverter duty motors have the quality of sturdiness among all rotating machines. Hence, over the years, other facilities such as the use of dc motors, eddy current controls etc. Compact square laminated steel frame fl210l440 fl180 is extruded aluminum for inverter duty and vector duty. Inverters simulate a low frequency by rapidly switching dc voltages in pulses which deliver power in approximate sine wave shapes. Marathon u759 general purpose motor, 3 phase inverter duty. For the latest prices, please check automationdirectcom.
Inverter duty motors tecowestinghouse motor company. With optimised operating functions, this series of motors for inverter duty has been developed focusing on the design of the magnetic circuit built with lowloss magnetic laminations. Inverter duty motors are wound with inverter grade magnet wire which has a higher resistance to voltage spikes. The difference between an inverterduty gearmotor and a standard gearmotor is in the construction. What means of inverterready and inverterduty motors. An inverter duty motor can withstand the higher voltage spikes producted by all vfds and can run at very slow speeds without overheating. They sit between the electrical supply and the motor. Remove motor from containers when heaters are energized, reprotect if necessary. Positive displacement pumps never use inverter duty motor even to getting a ratio 5. Inverterduty also sometimes listed as inverter ready means even more extras are built in. Contact the motor manufacturer for guidance relating to motordrive compatibility when peak voltages or rise times are expected to exceed these limits.
Inverter duty motors are wound with invertergrade magnet wire which has a higher resistance to voltage spikes. Invertervector motors are designed specifically for adjustable speed applications in a standard nema frame motor. Inverter duty is for the manufacturer to determine. Ideally suited for igbt power inverter duty insulation system over temperature protection. For use in constant torque conveyors and machine tools or variable torque pumps and fans variable speed applications within the stated speed range of the motor. Series 100 and phasor2000 styles are designed and manufactured for the most demanding applications. The frequency of the new pwm duty cycle update determines the motor frequency, while the value loaded in the duty cycle register determines the amplitude of the motor. Inverters offer speed or torque control of electric motors. Additional 5% discount when motor and drive are purchased on same order 5 year warranty single source reliability f510 odp rolled steel or cast iron eq7 maxe1 premium efficient variable. Although the first motor saw 460 volts rms, the last motor, feet of wire away saw 2000 volts. A motor that spends most of its life at 50% speed wont last long, inverter duty.
Ac motors can be driven by acrosstheline contactors and starters. The best way to solve this problem is to not create it in the first place. Additionally, the ac inverter vector motors can be ran across the line for bypass operation and can deliver a. There is a lot of misinformation getting spread around that basically says that you need inverter rated motors, but to date i have not found one study that shows that non inverter rated motors powered from a vfd failed at a higher rate when operated at 230 volts. The varnish is built up to a higher thickness than for standard motors, adding to the increased ability to withstand voltage spikes. Inverter duty motors severe duty motors inverter duty motors applications. To me the term inverter duty motor is a black max or blue max marathon motor or equal designed to run on variable frequency drive vfd power. Inverter duty ac motors 5200 frames vertical footless mounting water cooled increased safety atex category 23 g, exe gas group iic t3 temperature code motor. Conveyors often use one inverter to control multiple motors placed along the length of the conveyor. Inverter duty motors suppliers, distributors, traders and. With optimised operating functions, this series of motors for. One installation had 30 motors driven from one inverter. The other issue though, is that while theres a rule of thumb that a standard tefc motor can turn down to 50% of nominal speed, how much of the time it spends there will affect motor life. An inverterduty motor is a much newer concept that became necessary as motors began to be driven by variable frequency drives.
Inverter vector motors are designed specifically for adjustable speed applications in a standard nema frame motor. Whats the difference between standard and inverter. Marathon electric micromax ac inverter duty motors product spotlight november 14, 2016 0 comments marathon electrics micromax ac inverter duty motors are electric ac motors designed for direct replacement of pmdc or any other variable speed application where up to a. The difference between an inverter duty gearmotor and a standard gearmotor is in the construction.
The new pwm duty cycle values will take effect at the next timer2 overflow. Inverter duty series leeson motors ac motors product. Tefc motor is good for 51, and general design extruded aluminum or cast iron, high or premium efficient. These motors have a higher quality insulation and can withstand the voltage spikes generated by inverters.
Any trademarks used in this manual are the property of their respective owners. A definitepurpose inverterduty motor andor filters. Huge leeson inverter duty series ac motors inventory same day shipping expert technical support. Home ac 3phase inverter duty gearmotors and motors.
Contact the motor manufacturer for guidance relating to motor drive compatibility when peak voltages or rise times are expected to exceed these limits. The electricity sent to the motor is a very clean true sine wave. How an inverter drive works and controls the speed. What is an inverter inverter drive systems explains. Find details of companies offering inverter duty motors at best price. In some plants the motors can withstand harsh environments, but the control cannot. The high switching frequencies and fast voltage rise times of frequency inverters can produce high voltage peaks in the windings of standard ac motors that exceed their insulation break down voltage. H insulation system is used in baldor inverter drive and vector drive motors. Inverter duty condensor fan motors culver armature and motor. Peak torque is available for momentary overloads or acceleration. Leeson inverter duty series ac motors in stock at galco. Inverter duty rated to be corona free with conductive bearing grease for reliable use with todays inverters. An inverter duty motor can withstand the higher voltage spikes produced by all vfds amplified at longer. Mediumvoltage inverter duty motors with a base rating that exceeds 600 v must be.
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