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Topic: Squirrel cage rotor

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Induction motor

Electric motor

Shaded pole motor

Startup winding

Stator

Three phase

Stepper motor

Magnetic field

Polyphase system

Testing earth fault resistance

Commutator (electric)

Electromagnetic field

Transformer

Centrifugal switch

Two phase

	FAQ Darby Electric Co
		No. The number of rotor slots are never the same as the number of stator slots nor are they simple multiples of each other.
		Rotor slots are sometimes skewed from end to end to reduce noise and to smooth out torque variations.
		Because the rotor alternates at a much lower frequency than the stator, eddy current heating is usually not an issue for concern.
	www.darbyelectric.com /faqs.html (674 words)

	Wound rotor induction motors : AC MOTORS
		The complication and maintenance associated with brushes and slip rings is a disadvantage of the wound rotor as compared to the simple squirrel cage rotor.
		Since the speed of a wound rotor induction motor may be controlled over a range of 50-100% by inserting resistance in the rotor, we may expect the same of the doubly-fed induction generator.
		In actual practice, the rotor resistance may be replaced by a converter (Figure above) absorbing power from the rotor, and feeding power into the power line instead of dissipating it.
	www.allaboutcircuits.com /vol_2/chpt_13/8.html (820 words)

	U.S. Patent: 5637943 - Rotor groove - June 10, 1997
		The squirrel cage rotor of claim 1, wherein the protuberances and the bulges are of substantially similar shape.
		In rotors having aluminum-compression or centrifugally cast squirrel-cages in the revolution range over 6000Rpm, it is a common occurrence that the rotors become imbalanced due to the shifting or displacement of the conductor rods in their grooves.
		In a further embodiment of the squirrel cage rotor of this invention, the protuberances and the bulges are of substantially similar shape.
	www.everypatent.com /comp/pat5637943.html (1096 words)

	Tesla polyphase induction motors : AC MOTORS
		The rotor consists of a shaft, a steel laminated rotor, and an embedded copper or aluminum squirrel cage, shown at (b) removed from the rotor.
		The squirrel cage conductors may be skewed, twisted, with respsect to the shaft.
		The wound stator and the squirrel cage rotor of an induction motor may be cut at the circumference and unrolled into a linear induction motor.
	www.allaboutcircuits.com /vol_2/chpt_13/7.html (4429 words)

	Electric motors & motor controls engineering - SQUIRREL-CAGE ROTOR DESIGN..
		The torque is a fuction of the I^2R of the rotor with the R not necessarily the actual resistance of the rotor, but more the effective resistance of the rotor.
		The reistance of the rotor is a function of the cross sectional area and the material of the bar.
		The conical rotor is often fitted into a conical stator with a strong spring to act as a brake.
	www.eng-tips.com /viewthread.cfm?qid=42855 (894 words)

	BEVI A/S: Electric Motor Manufacturer, Squirrel Cage Induction Motors, 3 phase, Hazardous Location Motors and Safety, ...
		Vibrator motors are generally Three or Single Phase Squirrel Cage motors fitted with elliptical weights.
		Brake motors have the same characteristics as Three Phase Squirrel Cage motors due to the fact that the are Three Phase Squirrel Cage motors.
		Vertical Hollow Shaft Motors are in most cases Three Phase Squirrel Cage motors with as the name suggests a hollow shaft.
	www.bevi.dk /products (943 words)

	Squirrel cage rotor
		The squirrel cage is a special type of rotor winding.
		The ends of branches on each side of the squirrel cage rotor are short circuited.
		To model the squirrel-cage rotor the AC Magnetics module is suitable.
	www.quickfield.com /glossary/squirrel_cage_rotor.htm (177 words)

	Squirrel cage induction motor
		Reaction of a squirrel-cage rotor in a 2-pole field in the rotor reference frame: The flux density wave is moving at slip speed inducing in the rotor cage voltages of magnitude indicated by the blue vertical lines.
		Due to the leakage inductance, the resulting bar currents are delayed as represented by the red lines.
		The corresponding rotor-mmf is shown in the cyan-colored step wave together with its fundamental component.
	www.ece.umn.edu /users/riaz/animations/squirrelcage.html (69 words)

	Squirrel cage blower, blower - AFTERMARKET SQUIRREL CAGE (BLOWER FAN) 5 78"w x 2 1/2"h x 516
		The vendor supplied motor and squirrel cage rotor are connected and attached to the blower housing with brackets.
		Optimum performance is achieved with a squirrel cage blower of approximately 200 to 400 cubic feet per minute of air flow.
		In general, if the squirrel cage blower has enough capacity, it is a much better choice for a spray booth than the attic fan.
	blower.allinfosites.com /q/blower-squirrel-cage-blower.htm (653 words)

	Rotor Testing With MCE
		Rotor Defects were estimated to be responsible for approximately 10% of motor failures based on a 1980’s research effort on squirrel cage induction motors sponsored by EPRI and performed by General Electric.
		The problem with squirrel cage induction rotors is that the defects that occur are many times invisible to the naked eye, yet can still be catastrophic to the motor.
		Rotor lamination damage can result from numerous causes such as dropping the rotor during shipment, rotor/stator rub, overheating during a locked rotor condition, etc. A rotor/stator rub is relatively easy to identify if the motor is disassembled.
	www.pdma.com /Rotortest.html (2525 words)

	A Boyce's Electrical Webpage on 3-Phase Power (Site not responding. Last check: )
		Instead, current is induced in the rotor by the cutting of electromagnetic flux lines (from the rotating stator field) across the rotor windings.
		If the rotor were to turn at the same speed as the rotating field, no lines of force would be cut by the rotor conductors, and no rotor field would be produced.
		In this case, the coil ends are shorted together, and the operation of the motor is the same as for the squirrel cage rotor.
	ourworld.compuserve.com /homepages/boyce_smith/3phase.htm (561 words)

	Asynchronous (Induction) Generators
		The rotor consists of a number of copper or aluminium bars which are connected electrically by aluminium end rings, as you see in the picture to the left.
		The rotor is placed in the middle of the stator, which in this case, once again, is a 4-pole stator which is directly connected to the three phases of the electrical grid.
		In that case the rotor moves faster than the rotating magnetic field from the stator, which means that once again the stator induces a strong current in the rotor.
	www.aut.ac.ir /departments/elec/downloads/Wind/en/tour/wtrb/async.htm (909 words)

	Utility Products Magazine - The Resource for Power, Telecom and CATV Product Solutions (Site not responding. Last check: )
		The purpose of this article is to identify causes of rotor and rotor bar failure.
		Positioning the rotor through 18 points of one complete pole face in specific increments, determined by the amount of poles of the motor, allows us to analyze not only winding condition and air gap eccentricity, but rotor bar condition as well.
		This is the result of the distorted residual magnetic flux that develops in the area of the cracks or high resistance connections of the squirrel cage rotor.
	www.utilityproducts.com /Articles/2006/10/faultzone.htm (1220 words)

	Electrical Machinery
		The magnetic field in the rotor is constant, and corresponds to the constant flux in a transformer.
		There is now a phase difference between rotor and stator, inducing a voltage that reduces the back emf presented to the supply, and the current to the motor stator, in phase with the voltage, must increase to bring the back emf up to the supply voltage, exactly as in a transformer.
		When the conductors are on the surface of the rotor, actually in the magnetic field of the air gap, it is easy to see how the emf is induced, and how, if current flows, the force times distance equals the emf times current, as we pointed out at the beginning of this paper.
	www.du.edu /~jcalvert/tech/elmotors.htm (6995 words)

	PowerPedia:Induction motor - PESWiki
		An inside rotor attached to the output shaft that is given a torque by the rotating field.
		Through electromagnetic induction, the rotating magnetic field induces a current in the conductors in the rotor, which in turn sets up a counterbalancing magnetic field that causes the rotor to turn in the direction the field is rotating.
		This is why, as an example, a squirrel cage blower motor may cause the lights in a home to dim as it starts, but doesn't dim the lights when its fanbelt (and therefore mechanical load) is removed.
	peswiki.com /index.php/Induction_motor (2726 words)

	Electric Motors -- AC Motors -- DC Motors
		In this case, the rotor has the same number of poles as the stator and the windings are made of wire, connected to slip rings on the shaft.
		Compared to squirrel cage rotors, wound rotor motors are expensive and require maintenance of the slip rings and brushes, but they were the standard form for variable speed control before the advent of compact power electronic devices.
		electromagnetic induction, the rotating magnetic field induces a current in the conductors in the rotor, which in turn sets up a counterbalancing magnetic field that causes the rotor to turn in the direction the field is rotating.
	www.edinformatics.com /inventions_inventors/electric_motors.htm (3589 words)

	Asynchronous (Induction) Generators
		The rotor consists of a number of copper or aluminium bars which are connected electrically by aluminium end rings, as you see in the picture to the left.
		The rotor is placed in the middle of the stator, which in this case, once again, is a 4-pole stator which is directly connected to the three phases of the electrical grid.
		In that case the rotor moves faster than the rotating magnetic field from the stator, which means that once again the stator induces a strong current in the rotor.
	www.newenergy.org.cn /english/guide/async.htm (944 words)

	Circuit Cellar - Digital Library - CCO
		Squirrel cage rotors get their name from their geometry, which resembles the little exercise wheel found in hamster or gerbil cages.
		To people at the turn of the century, the rotor geometry resembled their squirrel cages.
		Without currents in the rotor, no magnetic field would be produced by the rotor to interact with the stator’s magnetic field.
	www.circuitcellar.com /library/details/0200/c0200cd4.htm (1130 words)

	cars - Electric motor
		These rotors take their name from "windings" that are in the style of the wheel on which pet rodents exercise: a series of bars that connect conductive rings at both ends of the rotor.
		As in the single-phase motor, through electromagnetic induction, the rotating magnetic field induces a current in the conductors in the rotor, which in turn sets up a counterbalancing magnetic field that causes the rotor to turn in the direction the field is rotating.
		Because the rotor is much lighter in weight (mass) than a conventional rotor formed from copper windings on steel laminations, the rotor can accelerate much more rapidly, often achieving a mechanical time constant under 1 ms.
	www.carluvers.com /cars/Electric_motor (3352 words)

	AC Electric Motor, HT Distribution Furnance Power Transformer, Electrical Control Panel :: Design Software by ...
		Get related design output data on core laminations, windings, connections, rotor cage winding, busbar ducts.
		single cage or double cage rotor or skewed rotor.
		Softbit has a wide range of technical training interactive presentations on ac generator, alternator, high voltage power transformer, HT distribution transformer, ac squirrel cage electric induction motor - TEFC, centrifugal pump.
	www.softbitonline.com (1770 words)

	torque motors, standard squirrel cage induction motors, fast tapping machine, variable speed drives, motors, geared ...
		Because of the same reason, these motors can also be used for applications requiring operation under stalled or locked rotor condition for extended/continuous period with a specific stalled torque value.
		Because of low starting current for a given starting torque, these motors can be generally offered in lower frame sizes when compared to squirrel cage motors for specific applications.
		The clamping, positioning or indexing machine can be electrically operated by a motor which is required to remain continuously under locked rotor condition.
	www.trimurtiengrs.com /torque_motors.htm (686 words)

	Simulating an AC Motor Drive :: Systems with Electric Drives (SimPowerSystems)
		The AC5 model is based on a wound rotor synchronous motor, and the AC6 model uses a permanent magnet synchronous motor.
		An AC machine is not so simple because of the interactions between the stator and the rotor fields, whose orientations are not held at 90 degrees but vary with the operating conditions.
		The rotor time constant is particularly difficult to measure precisely, and to make matters worse it varies with temperature.
	www.mathworks.com /access/helpdesk/help/toolbox/physmod/powersys/ug/f4-23133.html (3524 words)

	Relativistic asynchronous machine
		Manufactured as squirrel-cage rotor or short circuit rotor the bars are connected at the ends with short circuit rings.
		Then the rotor is shaped like a crossed frame antenna (similar to those used for radio bearing sometimes) and is penetrated by the rotating field.
		For the observer on the rotor is dφ'=0.
	www.tilmannschneider.de /rasm_en.html (2930 words)

	FEEE - Fundamentals of Electrical Engineering and Electronics: Wound rotor induction motors
		Squirrel cage induction motors draw 500% to over 1000% of full load current (FLC) during starting.
		) Slip is proportional to rotor resistance, and pullout torque is proportional to slip.
		The complication and maintenance associated with brushes and slip rings is a disadvantage of the wound rotor as compared to the simple squirrel cage rotor.
	www.vias.org /feee/c13_motors_09.html (458 words)

	Rockwell Automation - Reliance Electric D-7168-1 White Paper: Audible Noise
		The second motor has a copper cage, with round bars to avoid current redistribution; furthermore the bars are insulated with respect to the rotor iron in order to avoid extra losses, which are difficult to incorporate in the theoretical analysis.
		The area of the rotor bars is chosen in such a way that the torque and the losses at rated speed are the same as in the standard design.
		The type of motor used is also important: motors experiencing a large amount of current redistribution in the rotor during when supplied from the mains cause extra losses with inverter supply as the high frequency currents are concentrated in the upper portion of the rotor bars.
	www.reliance.com /prodserv/standriv/d7168_1.htm (3978 words)

	squirrel \| \| Dictionary & Translation by Babylon
		Squirrel is the common name for rodents of the family Sciuridae (from Greek skia "shadow" and oura "tail"; "tail that casts a shadow").
		These typical members of the family are tree squirrels with large bushy tails, and are indigenous to Europe, Asia and the Americas.
		The unrelated family Anomaluridae also have "squirrel" in their common name, though they are usually referred to as "scaly-tailed flying squirrels".
	www.babylon.com /definition/squirrel/All (654 words)

	Untitled (Site not responding. Last check: )
		This rotor is used for the hysteresis synchronous motor, which is an AC motor utilizing magnetic hysteresis for torque generation.
		Interestingly, the rotor can run stably at a synchronous speed and also at lower speeds, indicating that the hysteresis motor is a synchronous motor that also can be an asynchronous motor.
		This rotor is for the eddy-current motor, a special-type of induction motor.
	www.ewh.ieee.org /soc/es/Nov1997/09/INDEX.HTM (6123 words)

	Laboratory of Electromechanics
		The rotor of the motor is solid and coated with a high-conductive layer.
		Operating characteristics of a 50 kW, 30600 rpm motor were measured for a copper coated solid steel rotor and for the partly laminated squirrel cage rotor.
		While mechanical ageing of the laminated rotor design was not studied, it seemed a reasonable alternative for solid rotor designs in high-speed electric motors.
	www.tkk.fi /Units/Electromechanics/publications/abs1999 (2903 words)

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