Bobbin electromagnet coil

Types of bobbin electromagnet coils

Bobbin coils are wound on a bobbin or spool-shaped former and can be made from magnet wire, a conductor copper wire with a polyamide coating. This type of coil can be made in any shape and size and is low-cost and space-efficient. Hard and soft plastic bobbins can be used to make coils with a wide variety of insulation resistance and dielectric strength. The installations can be used in various applications, including rotor and stator components. They are also suitable for high-speed winding applications, such as in the bobbin-wound transformer, where the wire is wound directly over the insulating material of the bobbin.

And bobbin coils can be divided into the following types:

• Single-layer coil: This kind of coil is wound on a bobbin with a single layer of wire and is usually located at the central part of a magnetic field.
• Multi-layer coil: Multi-layer coils are located on the same bobbin through multiple wire layers. The use of multi-layer coils can raise the magnetic field strength of a bobbin coil electromagnet by increasing the number of wire turns without raising the bobin size.
• Solenoid coil: A solenoid bobbin coil electromagnet, generally formed as a cylinder, can be utilized to turn linear movement in many applications, for instance, locking mechanisms, valves, and auto controlling apparatuses.
• Toroidal coil: Toroidal coils have the shape of a doughnut, and they are wound around a toroidal core. Compared with solenoid coils, toroidal coils electromagnets have less magnetic field leakage, and they also consume less energy.
• Custom coils: Custom bobbin coils can customize based on specific needs and are available in various shapes, sizes, and specifications.

Specification and maintenance of bobbin electromagnet coil

Specification

• Working Temperature: Depending on the material and insulating layer used, the working temperature can vary. Typically, the working temperature is between -40℃ to 70℃, but some special coils can work at higher temperatures.
• Voltage: Bobbin coils can withstand different voltages depending on their application. High voltage may be necessary for some applications, while low voltage suffices for others.
• Frequency: The frequency indicates how many times the current changes per second. Some coils work at high frequencies, while others work at low frequencies.
• Resistance: The coil resistance affects the current that can pass through the coil. Lower resistance allows higher current flow.
• Inductance: This parameter describes the ability of the coil to generate an electromotive force (emf) due to the change of current. Higher inductance means that the coil can generate more emf.
• Size: The size of the bobbin coil, including diameter and length, depends on the application requirement. Usually, bigger coils can carry higher voltage and current.

Maintenance

• Environment: Keep the working environment clean. Try to avoid dust, water, and oil ingress. If need to use it in a humid environment, consider using a dehumidifier or heating element to prevent moisture from entering the coil.
• Temperature: Pay attention to the ambient temperature. Ensure it is in the range of the operating temperature. If the temperature is too high, consider using a cooling fan or heat sink to dissipate heat.
• Connection: Ensure that the connection of the coil is firm, avoiding loose or falling. Use a suitable connector and clamp to ensure reliable electrical connection.
• Testing: Regularly check and test the bobbin coils, such as checking the appearance, resistance, etc. If finding any problems, immediately repair or replace them.
• Shielding: If the coil is easy to be impacted or damaged, consider using some protection, such as enclosures, shields, etc., to protect it.
• Heat dissipation: Ensure that the coil's heat dissipation condition is good. Avoid obstruction of cooling holes and heat dissipation areas.

Scenarios of bobbin electromagnet coils

Because of their varied applications, bobbin electromagnet coils are used in different industries for various purposes.

In the telecom industry, bobbin coils are used in communication devices such as radios, telephones, and downlink equipment. They help in the modulation and transmission of signals. Also, bobbin coils are essential components of loudspeakers. They interact with magnets to produce sound. Besides, in the electric car industry, bobbin coils are integrated into electric motors. They create a rotating magnetic field that powers the motor.

Bobbins are of great significance in the medical field. Several medical diagnostic machines, such as magnetic resonance imaging (MRI) and CT scanners, utilize bobbin coils. The coil helps in generating the magnetic field necessary for imaging. Moreover, bobbin coils are crucial components of relays, transformers, solenoids, and inductors. In transformers, they are used for shielding and protecting wires. Inductor bobbin coils, on the other hand, are responsible for energy storage in electrical circuits.

Some electric power generation machines utilize bobbin coils. Turbine generators, for instance, have bobbin coils that are responsible for converting the electromagnetic energy produced during rotation into electric power. Additionally, bobbin coils are embedded in electric sensors that detect and measure changes in the environment, such as temperature or pressure changes.

How to choose bobbin electromagnet coils

Order the following tips for selecting the bobbin electromagnet coils for business use:

• Understand application requirements

  Understand the specific needs of the use case. Consider the required voltage and current levels and any space and weight limitations. Determine if there are any special environmental considerations, such as the need for moisture resistance or high-temperature tolerance.

• Research different coil types

  Familiarize oneself with the various bobbin coil designs and their properties. Learn about the differences between DC and AC coils and sealed and open coils.

• Find reputable manufacturers

  Look for manufacturers with a proven track record in coil production. Consider their experience in making coils for the intended application, whether it's for relays, switches, valves, or other devices. Review the manufacturer's quality control processes and certification standards.

• Request samples and test

  Before placing an order, it's wise to request samples of the chosen bobbin coils. Testing the samples helps determine if they perform well and meet specific needs. Evaluate their functionality, reliability, and compatibility with other components in the system.

• Negotiate pricing and minimum order quantity

  When ready to place an order, discuss pricing and minimum order quantity with the supplier. Consider the balance between cost-effectiveness and the number of coils required for production.

Q&A

Q1: Does bobbin coil design affect an electromagnet's strength?

A1: Yes, the bobbin coil design can affect the strength of an electromagnet. The strength of an electromagnet is influenced by factors such as the amount of turns of wire, the dimensions of the coil, and the material used for the core. Introducing a core into an electromagnet coil can significantly increase its strength. This is because the core redirects and concentrates the magnetic field lines created by the current flowing through the coil.

Q2: How do users connect bobbin coils to the circuit?

A2: Bobbin coils are connected to circuits using terminal posts, which are fastened to the coil's end by a screw. The terminal post is then wired to the circuit; other connection methods include soldering and using a connector and plug.

Q3: Are bobbin coils used in transformers?

A3: Yes, bobbin coils are used in transformers. They are sometimes referred to as transformer coils. The primary and secondary transformer coils are made from bobbin coils. The primary coil receives power while the secondary coil outputs power. Several electric transformers are designed with bobbin coils.

Q4:Can someone place a plastic core inside a bobbin coil?

A4: Yes, it is possible to place a plastic core inside a bobbin coil, particularly if the core needs to support the coil or provide insulation. Nonetheless, one should carefully consider the implications of using a plastic core in terms of electrical performance and the intended application of the coil.