Mag Drive Coupling

Mag drive coupling has magnets internal to the pump which is connected to the driving gear. The magnets can be ferrite type, sintered neodymium magnets(higher magnetic strength), and SmCo magnets(with temperature up to 350 Celsius). The magnets are typically encased into a metal(carbon steel, stainless steel etc.) or a plastic housing to prevent direct contact with pumped fluid, which may be flammable, explosive or corrosive. The housing connects the coupling to the driving gear. This housing separate the fluid from the air. Other magnets, connected to the motor, are external to the fluid and are magnetized to form the internal coupling. It’s critical to minimize the distance between the magnets because the magnetic strength will be decreased with distance squared.

 

 

A magnetic coupling is applied in magnetically coupled gear pumps to transfer torque into the pump. Traditional gear pumps utilize a motor shaft which is directly attached to a driving gear within the pump. The shaft must pass through a sliding seal to make this coupling. The typical life-limiting component in a direct drive pump is the seal. Regardless of seal type and quality, the seal will wear and eventually leak. Magnetic coupling establishes a hermetic seal while still coupling the motor to the driving gear.

 

 

 

• Hermetically sealed
• No contact of torque transmitting elements
• No maintenance necessary
• Simple structure, easy to assemble and debug
• Release over-load protection.

 

Material Selection:

Magnet: it’s based on working temperature and corrosion-resistance requirements.

NdFeB – Temperatures up to 150°C. Corrosion protection required.

Ceramic – Temperatures up to 250°C. Corrosion protection not required.

SmCo – Temperatures up to 350°C. Corrosion protection optional.

 

Housing: normal carbon steel, stainless steel(304, 316, 416 etc.), nickel super alloys (Inconel, Hastelloy, Monel, etc.)

 

Spacer sleeve: stainless steel, nickel super alloys (Inconel, Hastelloy, Monel, etc.), plastics (Nylon, Teflon, etc.), Ceramics.

 

 

• Chemical industry
• Oil and gas industry
• Refining technology
• Pharmaceutical industry
• Centrifugal pumps
• Drive mixers/agitators
• Food industry

 

 

We need your help to design the permanent magnetic coupling.

1. How much torque(force) would you like to transmit?
2. What’s the working speed?(velocity or RPM)
3. What’s the operating temperature range?
4. Is the containment shroud required? What pressure differential would you like the design to accommodate?
5. Dimensions reference

 

External Coupling

1). Shaft size

2). Mounting type

• Set screw and key
• Compression (threaded shaft end)
• Taper Lock (not available on all sizes)

3). Max. OD

4). Max. Length

 

Internal Coupling

1). Shaft size

2). Mounting Type

• Set Screw and key
• Compression (threaded shaft end)
• Taper Lock (not available on all sizes)

3). Max. Length

 

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