Magnetic Coupling

Magnetic coupling is a new kind of coupling,which connects motor and machine by permanent magnetic force.They work in the sealless magnetic drive pumps,which transporting volatile,flammable,explosive and toxic solutions with no leakage. The appearance of Magnetic coupling solved thoroughly the leak problems existed in dynamic sealing of certain mechanical devices.Magneic coupling are widely used in various industries and fields,such as chemical,papermaking,foodstuff, pharmacy,etc.

magnetic-coupling-assembly

A magnetic coupling is a device that is capable of transmitting force through space without physical contact. Attractive and repulsive magnetic forces are harnessed to perform work in either a linear or rotary fashion. In its simplest form, a magnetic coupling is comprised of two components: a driver and a follower.

magnetic-couplingThe driver is the portion of the mechanism connected to the prime mover (motor). Through magnetic interaction, the follower reacts to the motion of the driver, resulting in a non-contact transmission of mechanical energy. This non-contact power transmission has multiple benefits, including but not limited to:

1. Isolation of components

o minimizes or eliminates mechanical vibrations through magnetic damping
o allows for the insertion of a mechanical barrier between the driver and follower to separate environments and allow operation under pressure differentials

2. Highly tolerant of misalignment between the prime mover and load

o Axial
o Radial
o Angular

magnetic-couplingsAccording to the type of holes installed in the classification, can be divided into the following:

o Unthreaded Hole Type
o Axel Hole Type
o Flange Type

3. Speed variation and regulation between prime mover and load

a. Classifications of Magnetic Couplings:
Three classifications of magnetic couplings are available, depending on the intended use of the device:
Class 1 – Synchronous
Class 2 – Eddy Current
Class 3 – Hysteresis

b. Magnetic couplings are capable of transmitting forces both linearly and rotationally. Consequently, in addition to selecting the Class of coupling required (synchronous, eddy current, or hysteresis), the coupling type also needs to be specified. Two Types of couplings exist:
• Type 1 – Torque
• Type 2 – Linear

magnetic-coupling

magnetic-coupling

As their names imply, torque couplings (Type I) are used to transmit forces rotationally while linear couplings (Type II) are used to transmit forces linearly. As one might expect, each coupling Type also has a variety of geometric topologies that can be utilized to meet the design intent. The details of these configurations are found below.

FAQ-Help me designs

1. What type of coupling is required?
1. Linear
2. Torque
2. What topology are you considering?
1. Face-to-face (torque coupling)
2. Coaxial (torque coupling)
3. Tubular (linear coupling)
4. Planar (linear coupling)
3. How much force or torque would you like to transmit?
4. What Class of coupling are you considering?
1. Class I – Synchronous
2. Class II – Eddy Current
3. Class III – Hysteresis
5. What speed will the coupling be traveling? (velocity or RPM)
6. Is a barrier between the driver and follower required? If so, what pressure differential would you like the design to accommodate?
7. Across what temperature range will this coupling operate?
8. Are there corrosive elements or fluids that need to be taken into consideration? If so, what type are they?
9. Geometric requirements:
1. Driver
a. Shaft size
b. Mounting type
b1. Set screw and key
b2. Compression (threaded shaft end)
b3. Taper Lock (not available on all sizes)
c. Max. OD
d. Max. Length
2. Follower
a. Shaft size
b. Mounting Type
b1. Set Screw and key
b2. Compression (threaded shaft end)
b3. Taper Lock (not available on all sizes)
3. Max. Length
10. Bearing support (radial and axial) is typically provided outside of the coupling system, but can be accommodated in the design. Does bearing support need to be designed into the coupling?
11. Is dynamic balancing required (for rotary systems)?

Magnetic coupling is consist of external rotor,internal rotor and isolating cover. we can design and produce different Magnetic couplings according to customer’s requests.

Keywords: Magnetic Coupling, Permanent Magnetic Coupling, Magnetic Coupling for Hydraulic Pump, Magnetic Motor Coupling, Magnetic Couplings for Magnetic Drive Pump, Reliable Magnetic Coupling, Magnetic Pump Coupling

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