The shaded pole motor has poor starting torque, the power losses are very high, and the starting power factor is very low. Hence the motor gives us low efficiency for a higher power rating design. Thats why the motor is designed with a low power rating typically 1/20 HP. Its design is kept small, and the motor has low power ratings. Shaded pole motor is one of the types of single phase induction motors, which are used for producing a rotating stator flux in order to make the single phase induction motor a self starting one. This motor is designed for very low HP like 1/25 to 1/6 HP. YJF48/ 48mm C-frame Shaded Pole Motor. Shaded pole motor is a split-phase type single phase induction motor. 
One class of single phase induction motor that is cheaper than any of thetwo winding (or "split-phase") designs is the shaded pole motor. The construction of a shaded type induction motor is similar to a normal single-phase induction motor, except for its stator pole. near Cincinnati, OH. 
This motor contains no start windings or centrifugal switch. Most commonly used motor. That's how you would get variable speed with voltage. The original post though said nothing about a fan load (which is a special case), and he said it was for a permanent magnet style. 50 or 60 Hz. They are self-starting, maintenance-free, and radio interference-free. Applications for this type of motor include fans, can openers, blowers, and electric razors. Thats why the motor is designed with a low power rating typically
The construction of the shaded pole induction motor is very simple. The stator poles of a shaded pole motor are divided into two parts. The shaded pole motor has poor starting torque, the power losses are very high, and the starting power factor is very low. B. AC motors are electrical devices that convert electrical current into mechanical rotational energy, or torque, by using alternating current (AC) from an electrical power grid or electrical generator. Industries overview. Figure 3. Just like any other single phase motor, it is not self-starting and is provided with a special arrangement to generate the rotating magnetic field. However, unlike PSC motor s and split phase motors a shaded pole motor does not have any capacitors or a centrifugal switch. The shaded pole induction motor is a self-starting single-phase induction motor with a copper ring shading one of the poles. Typically these motors are used insizes up to 1/20 hp (less than 40W) A diagram of a simple shaded pole motor is shown below. 1/25 th HP. HP. The auxiliary winding is composed of a copper ring, called a shaded pole coil. Internal structure and principle: This type of motor has single coil in stator. The shaded pole motor may have two or four poles. Here in this article, we use the two pole motor for the sake of simplicity. The speed of the motor is inversely proportional to the number of poles used in the motor. Stator The stator of the shaded pole motor has a salient pole. The reversal of the direction of rotation in the shaded pole motors is not possible. The characteristics of a shaded pole induction motor are given below . Solution for The maximum size of a shaded-pole motor is about A. These coppers ring acts as a secondary winding for the motor. A shaded pole motor is a small squirrel-cage motor in which the auxiliary winding is composed of a copper ring or bar surrounding a portion of each pole. Voltage-only control of a Shaded Pole (SP) motor is an acceptable method and is the most common. In the case of Figure 1 the unshaded coil will follow the magnetising current of the primary coil. This type of motor has also low torque. It belongs to a large category of fractional horsepower motors. So we can call this part as the shaded part and other parts of the pole as unshaded part. Selecting a 2 poled stator gives a synchronous speed of 3000 rpm while a 4 poled stator speed will be 1500rpm for 50Hz supply. The rotor of shaded pole induction motors is the Squirrel Cage type rotor. Permanent Split Capacitor and Shaded Pole Motors, NEMA Horsepower and Speed Ratings . Oct 29, 2021. A shaded pole induction motor is simply a self-starting single-phase induction motor whose one pole is shaded by a copper ring. The shaded pole motors rotate only in a particular direction, and the reverse motion of the motor is not possible. The current in the coil delays the phase of the magnetic flux at the pole to provide a rotating magnetic field. Besides the inefficiency (in non-heater applications) my other gripe with average grade shaded pole motors is the typical, low lifespan of the bearings. Because of the weak starting torque, shaded-pole motors are built only in small sizes ranging from 1/20 to 1/6 hp. A better diagram. NEW! Dayton 3M724 Motor 115V Double Shaft 1/40 HP 1550 RPM HVAC Stud Mount. Applications for this type of motor include fans, can openers, blowers, and electric razors. A capacitor is usually used to help run the motor and generate more torque. An ordinary shaded pole motor can simply "slip" a lot when driving a fan. An economical, high-performance EC blower for all hoods. The shaded pole motor is considered the most popular type of single phase induction motor in the small fractional horsepower range, and is widely used for driving fans. These motors have low starting torque, efficiency and power factor. Shaded Pole Induction Motors Working and Construction. Shafts can be , 5/16, or 3/8-inch diameter; 1/50th to 1/10th HP; UL and CSA Recognized. The shaded pole motor supply winding on the main poles forms the main winding. Shaded pole motor is a type of single-phase motor. Source: HPACmag. Hence the motor gives us low efficiency for a higher power rating design. 2,956. Sorted by: 1. The shaded-pole induction motor is popular because of its simplicity and long life. DAYTON 1/20 HP, HVAC Motor, Shaded Pole, 1550 Nameplate RPM, 115 Voltage. Thinline design for use in applications where space is limited. The general forms of construction are outlined in this paper, in which the equations for this type of motor are derived and the performance characteristics are discussed. Shaded Pole Motors. Figure 2. It contains a squirrel-cage rotor and operates on the principle of a rotating magnetic field created by a shading coil wound on one side of each pole piece. Image not available. Let us discuss the constructional details, diagrams and working of shaded pole motors in detail. Dimension A varies from 2 to 3 inches.
Because of the weak starting torque, shaded-pole motors are built only in small sizes ranging from 1/20 to 1/6 hp. The synchronous speed for a four-pole machine is obtained from the relation n = 120 f/p, where f frequency in Hz and p the number of poles. Also, the beer can motor isn't really a shaded pole motor: that's a "Permanent Split Capacitor" motor ( PSC, aka Cap Start/Cap Run). Rated Power 1/100 HP 1/30 HP, Rated Speed 1500 rpm 3000 rpm It doesn't work on other types of AC motors, but because of some of the inherent design aspects of what make a SP motor work in the first place, the torque / speed relationship is more or less linear, or can be made to appear so. The shaded pole motors are very cheap. These motors can run either single or multiple speeds. $65.99. Shaded Two-Pole Motors: Open Frame; Unidirectional; Perfect for fans, humidifiers, compressors, pumps and HVAC equipment. The motor you have seems to have a core of the type shown in Figure 3. 60-Hertz Synchronous Rpm. Unidirectional Max Open Frame 1,000 RPM. When single-phase AC supply is applied to the stator winding, due to shading provided to the poles, a rotating magnetic field is generated. Because of its proper concept, the shaded pole motor is highly common for ratings below 0.05 HP (40 W). Step #3 Calculate the Slip. Figure: Shaded-pole motor with two stator poles. Free shipping. Ventilation technology Shaded-pole motors ; Shaded-pole motors. PSC (Permanent Split Capacitor) Motor. Back | Industries. Location. $32.00. It has salient poles on the stator excited by a single-phase supply and a squirrel cage rotor. A copper ring is also called a shaded ring. Hover to zoom. The shaded pole motor is very popular for ratings below 0.05 HP (~ 40 W) because of its extremely simple construction. #4. Membership Services. The motors that are built with fractional horsepower sizes are called small motors. A shaded pole motor is an AC single-phase induction motor. Permanent Split Capacitor Motors .
Shaded-pole motors are best suited to the low-power household application, because the motors have low starting torque and efficiency ratings. A PSC motor is usually 40-60% efficient, meaning you're only going to get about 40-60% output power from the motor. SHADED SIX-POLE MOTOR. Typical NEMA horsepower and speed ratings for permanent Split Capacitor and Shaded Pole Motors rated at 115, 200, and 230 volts. Shaded-pole motors are best suited to low-power household application, because the motors have low starting torque and efficiency ratings. Shaded Pole Induction Motors is an important Product for industrial applications. C. 1/100 th HP. Motors of this design are simple and robust. Thus, n = (120) (60)/4 = 1800 r/min. They are most useful in homes, offices, businesses, and many more. + $15.19 shipping. A cut is applied on the pole section and inserted a thick copper strip in that slotted pole section. It is also a salient pole split phase motor. The shaded poles will follow a little later with a resulting clockwise rotation. x. It's probably easiest to explain why the current in the ring leads the current in the electromagnet by looking at them without the motor present, and with a transient voltage rather than AC. Options include: single- or multi-speed, 100 to 240 VAC, 50 or 60 Hz., 5/16 or 3/8-inch diameter shaft, 1/40 to 1/10 th HP. D. 1/20 th HP.