Shaded Pole AC Motors Manufacturer in China

A Shaded Pole motor is a single phase induction motor. 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 motors and split phase motors – a shaded pole motor does not have any capacitors or a centrifugal switch. Instead, a shaded pole motor uses an auxiliary winding which is basically a copper ring surrounding a portion of each pole to generate the starting torque. The design of a Shaded Pole motor is very basic, which makes it very easy to manufacture. SherryMotor not only provides a complete range of standard and custom C-frame shaded pole motors but also offer a large selections of shaded pole motors driven cross-flow/tangential fans, squirrel cage fans, axial fans, blowers and small pumps, such as the direct replacement kits of Broan ventilation fans. We leverage our large manufacturing network in China to provide the most cost-effective C-frame shaded pole motor and fan solutions for our customers.

What Is A Shaded Pole AC 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. When single phase AC supply is applied to the stator winding, due to shading provided to the poles, a rotating magnetic field is generated.

This auxiliary single-turn winding is called a shading coil. Currents induced in this coil by the magnetic field create a second electrical phase by delaying the phase of magnetic flux change for that shaded pole enough to provide a 2-phase rotating magnetic field. The direction of rotation is from the unshaded side to the shaded ring side of the pole. Since the phase angle between the shaded and unshaded sections is small, shaded-pole motors produce only a small starting torque relative to torque at full speed.

Shaded-pole motors of the asymmetrical type shown are only reversible by disassembly and flipping over the stator, though some similar looking motors have small, switch-shortable auxiliary windings of thin wire instead of thick copper bars and can reverse electrically. Another method of electrical reversing involves four coils.

Advantages of Shaded Pole AC Motors

Simplest construction, no need for capacitor or centrifugal switch.
Reliable & Long life, robust in nature
Less starting current and it does not cause a voltage drop across the nearest feeder.
Capable of self-starting

Low cost
Easy to rewind and maintenance-free motors.
It does not require any special starting methods.
Does not cause a voltage drop across the nearest feeder
Less starting current

How we ensure a profitable business partnership

Professionally Trained Engineering & Manufacturing Team

Producing custom-made, DC motors is a complex process.
Even before the raw materials are trucked to the manufacturing plant and brought to the production line, both the client and electric motor manufacturer have started to solidify their working relationship by laying the ground work that’s required prior to the commencement of production.
Successful working relationships require trained professionals, including engineering, manufacturing, supply chain, logistics, quality control, among others, to create not only the motor design and prototypes, but also the manufacturing processes and delivery channels.
Sherrymotors has built a design and manufacturing team of highly trained and customer-focused professionals.
It leverages both the technical expertise and customer service skills of its staff to ensure production goals occur within budget.

Comprehensive Manufacturing Facilities

Manufacturing any product requires both the equipment and facilities to handle projected production volume, capacity or throughput.
Beyond capacity considerations, what’s key for a custom electric motors manufacturer is to have all the machinery, equipment and testing capabilities in house and on-site so it can produce motors from start to finish in a timely fashion.
Sherrymotors has built a state-of-the-art comprehensive production facility that’s fully equipped to manufacture even high volume runs.
It’s onsite process equipment includes, CNC machining, shaft splining, automated magnetizing, heat treating, epoxy coating insulation, automated coiling, winding, commutator slotting and balancing, varnishing and welding/painting/special fabrication.
It also has a testing laboratory, which includes a 30 HP dynamometer and 500 Amp testing capability, to conduct both standard and special tests.

Standardized Work Processes Verified by Quality Control Systems

One of the motivations for using a custom motor manufacturer is the belief that a specialist can manufacture a motor, quicker, less expensively and with a greater level of quality. It is the ability to manufacture a quality product that reaps both cost and time benefits.
To obtain a high level of quality, a successful DC motor manufacturer should implement standardized work processes to enhance consistency and reliability. The motors should be tested throughout the production chain to verify this quality.
Sherrymotors understands the vital importance of manufacturing process control to produce consistent and reliable product.
Sherrymotors has invested in ISO-9001: 2008 registration and implemented Lean Six Sigma initiatives. All of its machining operations undergo first piece inspections and all of its motors go through end-of-line testing.
Sherrymotors uses documented manufacturing procedures and its production work-stations are linked to the engineering department to ensure all parts are manufactured to the latest revisions.

Shaded Pole AC Motors List

A comprehensive list of Shaded Pole Induction Motors Services is available on the SherryMotor website, which covers all OEM fleets. SherryMotor vendors can assist you with this. To learn more about how to connect with a wide range of service providers who consistently provide the highest quality goods, please contact shaded pole induction motors experts on SherryMotor.

Applications of Shaded Pole AC Motors

Applications are generally in small electrical appliances that require only a few watts of power, for example, for driving heater fans or slide projector fans. In the household appliance market, shaded-pole motors are used in washing machines as discharge pump motors and cookers as fan motors in large quantities. In ironing machines, these motors are used with reduction gearing for driving the rollers. It finds use for starting electronic clocks and single-phase synchronous timing motors.

The motor is also used in vending machines for driving the fans and in combination with gearing and linkages for selecting and delivering the goods.

How to choose Shaded Pole AC Motor?

There are many aspects to consider when choosing an ac induction motor such as supply voltage, horsepower rating, and the application itself.

Factors to Consider When Buying a Single Phase AC Motor

01 voltage

The first consideration is the voltage rating of the magnetic wire used in the motor windings. This rating can range from 1000 to 1600 V, with a common value of 1200 V. The greater the distance between the drive and the motor the greater the magnitude of the voltage spikes reaching the motor. A motor that has a 1600 V magnetic wire may have a reference to NEMA MG-1 2003, Part 31, Section 4, which states that a motor shall resist corona inception voltage (CIV) damage at voltages up to 1,600 V.

02 the constant torque (CT) turn-down ratio of the motor

The second consideration may be the constant torque (CT) turn-down ratio of the motor, often listed a “xx:1 CT”. This expresses how slow the motor can run and still deliver the same torque as it would at rated speed. Below this value the torque production capabilities of the motor decrease. For example, consider a 10 HP motor with a base speed of 1,800 RPM. It can produce 29 lb-ft of torque at rated speed (approximately 1800 RPM). If it has a 10:1 CT rating, it can produce that same torque down to 180 RPM. If it is a 1000:1 CT, then it could produce 29 lb-ft of torque as low as 1.8 RPM.

Also ask how the motor stays cool if it has the typical shaft mount fan and the motor is running at a fraction of the rated speed. The fan doesn’t move much air at low speeds. Therefore, if the motor is running at low speed and producing high torque for an extended time, the motor will produce much heat and a different cooling method should be chosen-a blower-cooled motor. The blower has its own motor, separately controlled-not by the attached VFD. The airflow across the motor is constant and sufficient to keep the motor cool-even at low speed or zero speed.

03 horsepower and torque

The base speed of the motor is another important aspect when choosing an ac induction motor. It is common to see 2-pole (3600 RPM) and 4-pole (1800 RPM motors). However, 6-, 8-, and 12-pole (1200, 900, and 600 RPM) motors can be found as well. The base speed of a motor is related to the number of poles the motor contains by this equation: [RPM = (120 x design frequency) / # poles]. As a side note; although related, typically as the number of poles increase so does the size as well as overall costs.

Users might also want to swap speed for torque, depending on the application. In general, as the speed of the motor increases, the torque decreases, which is also true of gearboxes and belt and chain drives. This relationship is explained by this equation: [HP = (torque x base speed) / 5252)].

The horsepower and base speed of the motor, along with any associated gearing, can be selected to meet the original goal, which is reducing the cost of equipment, size, and lead time for replacement components.

04 application

The application itself should be considered when choosing an ac induction motor.

05 Harsh or wet

Harsh or wet conditions may require a special kind of ac induction motor for the particular application.

06 Base speed

Base speed and torque also should be considered by the user, depending on the application.