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Topic: Shaded pole motor


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  TT Motors
Induction motors are called that because the rotor magnetisation is induced by relative motion between the rotor and the stator field.
Motors such as the shaded pole in the 301 are designed to run at a torque which corresponds to 5-10% slip, which is in a reasonably linear part of their speed / torque curve.
Stepper motors are a specialised type of synchronous motor which are constructed to allow accurate positioning of the rotor WRT the stator.
www.members.iinet.net.au /~quiddity/audio/Turntable_motors.html   (2500 words)

  
 Tool Building - Misc
Shaded Pole - a heavy wire is wrapped around one "pole" of the winding, hence the name "shaded pole".
A typical use for a shaded pole motor would be a humidifier, or the electronic damper on your furnace.
There are some condenser fan motors used on the outdoor units of air conditioners that are induction motors and that have a speed of 800 to 825 RPM.
www.bamboorodmaking.com /html/tool_building_-_misc.html   (1111 words)

  
 PowerPedia:Electric motor - PESWiki
As the poles of the armature electromagnet pass the poles of the permanent magnets, the commutator reverses the polarity of the armature electromagnet.
Part of each pole is encircled by a copper coil or strap; the induced current in the strap opposes the change of flux through the coil (Lenz's Law), so that the maximum field intensity moves across the pole face on each cycle, thus producing the required rotating magnetic field.
In all BLDC motors, the stator-coils are stationary.
www.peswiki.com /index.php/Electric_motor   (7600 words)

  
 AC Motors - Offshore Solutions
The speed at which the magnetic field rotates is the synchronous speed of the motor and is determined by the number of poles in the stator and the frequency of the power supply.
Application of wound-rotor motors is markedly different from squirrel-cage motors because of the accessibility of the rotor circuit.
Shaded pole motors have low starting torque and are available only in fractional and subfractional horsepower sizes.
www.offshoresolutions.com /products/motors/ac/induction.htm   (1139 words)

  
 Reference.com/Encyclopedia/Shaded-pole synchronous motor
But unlike a shaded pole induction motor (which uses a squirrel cage rotor), the synchronous version of this motor uses a magnetized rotor.
In these applications, the speed of the motor is as accurate as the frequency of the mains power applied to the motor.
Such geared motors are commonly available with the final output shaft or gear rotating from 600 RPM down to as low as 1/168 Revolution Per Hour (1 Revolution Per Week!).
www.reference.com /browse/wiki/Shaded-pole_synchronous_motor   (398 words)

  
 Electrical Machinery
Electrical motors were invented early, in the 1830's, as soon as the magnetic effects of electrical currents and the magnetic properties of iron became known.
As the load on the motor increases, the armature current increases, and the magnetic field it produces causes the total magnetic field to change so that the brushes must be shifted to a new point of zero current.
Split-phase motors use a separate winding of higher inductance to produce a phase shift; capacitor motors use a capacitor for the same effect, and the capacitor can be switched out after the motor has started and has come up to speed.
www.du.edu /~jcalvert/tech/elmotors.htm   (6995 words)

  
 [No title]
The speed at which the magnetic field rotates is the synchronous speed of the motor and is determined by the number of poles in the stator and the frequency of the power supply.
Application of wound-rotor motors is markedly different from squirrel-cage motors because of the accessibility of the rotor circuit.
Shaded pole motors have low starting torque and are available only in fractional and subfractional horsepower sizes.
www.electricmotors.machinedesign.com /guiEdits/Content/bdeee11/bdeee11_7.aspx   (1111 words)

  
 intereststuff
In the shaded pole motor, the stator poles are notched and a copper short circuiting ring is installed around a small section of the poles.
As a result of the alteration of the filed pole configuration, the build-up of the magnetic field is delayed in the portion of the pole surrounded by the copper shorting ring.
The shaded pole motor is simple and inexpensive, but has low efficiency and a very low starting torque.
www.bcelectrician.com /interest.html   (681 words)

  
 The educational encyclopedia, single phase AC motors, universal AC motors
AC motors single phase, three phase, AC induction motors are the most common motors used in industrial motion control systems, as well as in main powered home appliances.
Shaded pole motor shaded pole motor, The simplest and least expensive type of single phase motor is the shaded pole motor.
Shaded pole motor shaded pole motor, hey consist of two basic electrical assemblies: the wound stator and the rotor assembly, the rotor consists of laminated, cylindrical iron cores with slots for receiving the conductors
www.educypedia.be /electronics/motoracsingle.htm   (749 words)

  
 Motors & Drives   (Site not responding. Last check: 2007-10-16)
The pole structure of the shaded pole motor enables the development of a rotating magnetic field by delaying the buildup of magnetic flux.
In the shaded portion, magnetic flux increases but is delayed by the current induced in the copper shield.
Shaded pole motors are best suited to low power household application because the motors have low starting torque and efficiency ratings.
elpaso.apogee.net /md/mfmssha.asp   (233 words)

  
 Greenheck Fan Corporation - Application Guides
This “shades” that portion of the pole, causing the magnetic field in the ringed area to lag the field in the non-ringed portion.
•2, 4, and 6 pole (3450, 1725, and 1140 rpm)
Motor protection (Thermal overload) A thermal protector, automatic or manual is mounted in the end frame or on a winding and is designed to prevent a motor from getting too hot, causing possible fire or damage to the motor.
www.greenheck.com /technical/tech_detail.php?display=files/Product_guide/motorarticle   (5641 words)

  
 Motor Characteristics - SDP/SI Tech Library D220-T145
The torque characteristics and application of the shaded pole motor is similar to the permanent-split capacitor motors.
The motor starts as a series motor and at a predetermined speed, all the commutator bars are electrically shorted by a device called a "necklace" to give the equivalent of a squirrel cage winding.
In this type of motor the stator windings are excited by polyphase currents which produce a rotating field which causes the rotor to follow It and thereby act as a motor.
www.sdp-si.com /D220/HTML/D220T145.htm   (643 words)

  
 Emergency Situations
If the motor you are using as a replacement is not an exact match with the original, the minimum check you must do is to measure the input amps to the substitute motor.
It is acceptable emergency practice to replace a multi-speed motor with the equivalent-rated single speed motor, and vice versa.
Any motor built to NEMA standards must be capable of delivering its nameplate horsepower without overheating over a voltage range of plus or minus 10 percent of its nameplate voltage.
www.aosmithmotors.com /html/motorDoctor/emergency.html   (1213 words)

  
 A Boyce's Electrical Shaded Pole Motors Webpage   (Site not responding. Last check: 2007-10-16)
A shaded-pole motor is so named because it uses a small shorted Shading Coil wound in a small notch in the stator pole piece.
The electromagnetic field in the pole piece then appears to be stronger on the side nearest (or through) the shading coil.
This produces a sweeping motion from side to side in the stator pole piece, although small, this motion is enough to maintain an induced voltage in the rotor and start the rotor turning.
ourworld.compuserve.com /homepages/boyce_smith/shaded.htm   (166 words)

  
 Testing Motors
Motors in many popular appliances and are easy to test and replace.
Motors are important components to hundreds of devices we use in daily life.
It works about the same as the universal motor, but is less expensive to manufacture so it typically goes into lower-cost low-load small appliances.
www.bobvila.com /FixItClub/Task/Repairing/FIG_Motor.html   (530 words)

  
 Single-Phase Electric Motor Characteristics Applications Leeson Motors Distributors
The key: First, size the motor to the application but, just as importantly, understand the characteristics of the major types of single-phase motors characteristics that go right to the heart of matching a motor to an application.
A squirrel-cage ABB Motor connected to a single-phase line develops no starting torque, but having been started by some external means, it runs approximately like a polyphase motor.
This "shades" that portion of the pole, causing the magnetic field in the ringed area to lag the field in the unringed portion.
www.clrwtr.com /Single-Phase-Electric-Motors-Characteristics-Applications.htm   (1832 words)

  
 AC motors
The inventor of the three-phase AC motor was Nikola Tesla, a pioneer in electromagnetism.
The pole pieces with the windings have a slot in them to create a delayed flux, creating a direction for rotation.
This shows that the speed of this motor is dependant on the frequency of the power applied to it.
my.execpc.com /~rhoadley/magacmot.htm   (974 words)

  
 Shaded-pole motor - Wikipedia, the free encyclopedia
A shaded pole motor is a type of AC single phase induction motor.
As in other induction motors the rotating part is a squirrel cage rotor.
All single-phase motors require a means of producing a rotating magnetic field for starting.
en.wikipedia.org /wiki/Shaded_pole_motor   (233 words)

  
 Fans And Blowers
1/20 HP motor with start-up amperage of 2.8.
1/5 HP motor with start-up amperage of 9.8.
Shutter motor is equipped with single phase motor, motor plate, linkage, and mounting hardware.
www.solar-components.com /fans.htm   (387 words)

  
 Shaded-pole induction motors
In addition, portions of the pole piece surfaces are surrounded by a copper strap called a shading coil.
The effect is to concentrate the lines of force in the shaded portion of the pole face (3).
Common synchronous speeds for 60-hertz motors are 3600, 1800, 1200, and 900 rpm, depending on the number of poles in the original design.
www.tpub.com /neets/book5/18e.htm   (666 words)

  
 Circuit Cellar - Digital Library - CCO
The exposed copper band is "shading" the small portion of the pole from the magnetic field that is developed in the large pole.
This causes a slight delay in the growth and collapse of the magnetic field in the smaller shaded-pole with respect to the larger pole.
In transformers and motors, one prominent failure mechanism is the shorting of windings.
www.circuitcellar.com /library/details/0200/c0200cd5.htm   (879 words)

  
 How real electric motors work
It's excited by the same winding as the main pole, but is "shaded" from it by a thick copper band that wraps around the laminations and acts like a shorted electrical turn.
A 3-phase motor simply places three windings at 120 degree intervals around the casing, and a rotating magnetic field is automatically produced.
Three-phase induction motors are the “workhorse” of industry, with large units having ratings well in excess of a megawatt.
www.phys.unsw.edu.au /hsc/hsc/electric_motors1.html   (1107 words)

  
 Leeson Single Phase Electric Motor characteristics and applications
Single-phase AC motors are as ubiquitous as they are useful -- serving as the prime power sources for a seemingly limitless array of small-horsepower applications in industry and in the home.
The key: First, size the motor to the application but, just as importantly, understand the characteristics of the major types of single-phase motors -- characteristics that go right to the heart of matching a motor to an application.
A squirrel-cage motor connected to a single-phase line develops no starting torque, but having been started by some external means, it runs approximately like a polyphase motor.
www.iprocessmart.com /leeson/leeson_singlephase_article.htm   (1664 words)

  
 Universal Motors
These motors are normally made in sizes ranging from 1/ 200 to 1/ 3 horsepower.
This action causes the shaded poles to be out of phase with the main poles and a weak rotating magnetic field is produced.
The speed of these motors is varied by inserting a choke coil in series with the main winding.
www.tpub.com /ceb/109.htm   (573 words)

  
 Electrical and Electronics: Module 15
15.10 To identify the shading coil in a shaded pole motor.
Use a meter to identify the different windings on a shaded pole motor.
Students wire a shaded pole motor to the appropriate voltage.
www.sasked.gov.sk.ca /docs/paa/elec/mod15.html   (565 words)

  
 PowerPedia:Induction motor - PESWiki
Electric Motor - 1889 December 3 - This drawings include the motor seen in many of Tesla's photos; Classic alternating current electro-magnetic motor; Induction motor operation; Field and armature of equal strengths or magnetic quality; field and armature cores of equal amounts; Coils containing equal amount of copper.
Before the invention of the rotating magnetic field, motors operated by continually passing a conductor through a stationary magnetic field (as in homopolar motors).
Most common AC motors use the squirrel cage rotor, which will be found in virtually all domestic and light industrial alternating current motors.
peswiki.com /index.php/PowerPedia:Induction_motor   (3333 words)

  
 Kwan Long Electric Motor Co., Ltd.   (Site not responding. Last check: 2007-10-16)
We are an AC motor manufacturer based in Taipei.
Our product range include shaded pole motors, condenser run motors and coolant pump.
motor, motors, kwanlong, kwan long, AC motor, shaded pole, shadedpole, shaded-pole, condenser run, condenserrun, condenser-run, shaded pole motor, condenser run motor, pump, coolant, coolant pump, fan motor, air-conditioner motor, air-conditioner fan motor,
www.kwanlongmotor.com   (76 words)

  
 Exhibit Cross Reference - Shaded Pole Motor II   (Site not responding. Last check: 2007-10-16)
This exhibit demonstrates the operation of a SHADED POLE MOTOR.
A shaded pole motor creates a moving magnetic field from ordinary household electricity.
By turning a knob, visitors can change the direction in which the magnetic field moves, and thus control the disk's spin, causing it to either slow down, speed up, stop, or turn in the opposite direction.
www.exploratorium.edu /xref/exhibits/shaded_pole_motor_ii.html   (105 words)

  
 MOTOR (US3634707)
In a shaded-pole motor having centrosymmetrical construction and concentrated windings on salient poles and a partially widened airgap, the improvement wherein each of such salient poles is shaped so that:
the angle enclosed between the pole axis and the neutral axis, on the shaded-pole side of the pole axis is less than that on the main pole side;
the airgap adjacent to the pole has a configuration across the main pole portion of each pole face which conforms substantially to the equation:
www.delphion.com /details?pn10=US03634707   (233 words)

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