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P16b Magnet Target Wheel

 

Bonded multi-pole magnet rotors are used in a wide variety of speed and commutation applications such as to rotary encoders, speedometers and machine controls. Three standard grades of magnetic materials are offered to fulfill a broad spectrum of magnetic field requirements along with a high resistance to demagnetization. Combined with a Nylon polymer binder, they offer excellent dimensional control and tough environmental endurance. Multi-pole rotors can be modified to have other pole patterns, custom compounded binders, or metal inserts for specialized applications.

 

Features:

• Rugged, chip free construction
• Wide range of pole counts
• Three grades of magnetic materials
• High resistance to demagnetization
• Operation from -40 to 125 degrees C
• Well suited for general industrial environments
• Aluminum hub with set screw
• Many additional, non stocked pole counts available
   
   

View Data Sheet .pdf file

Other P16 Series Configurations

• P16A - As Molded for Adhesive Attachment
• P16C - Powdered Metal Hub for press fit
• P16D - Overmolded Target for High Speed Applications

OTHER STANDARD MAGNET TARGET WHEELS

FOR COMPLETE LIST OF MAGNETIC SPEED SENSORS - CLICK HERE

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MATERIAL DESIGNATION
Number of Poles	Magnalox 300	Neobond 12M	Neobond 30M
2	P16B25R2	P16B50R2	P16B75R2
4	P16B25R4	P16B50R4	P16B75R4
8	P16B25R8	P16B50R8	P16B75R8
16	P16B25R16	P16B50R16	P16B75R16
30	P16B25R30	P16B50R30	P16B75R30
40	P16B25R40	P16B50R40	P16B75R40
60	P16B25R60	P16B50R60	P16B75R60

 

The following data was developed as a design guide for the popular P16A magnet target wheel. The graphs below are plots of the lowest magnetic fields expected under typical manufacturing, environmental and dimensional limits. There is a graph for each of the various number of magnetic poles available on a target wheel. Within each graph are plots for three grades of magnetic materials. These three magnetic materials represent the standard materials available that are stocked but are in no way a limit to the magnetic materials available for custom products.  If information is needed for other specific target wheels, please feel free to contact the factory directly for assistance.

To use the graphs below, the total gap of the magnetic circuit must be known. The total gap of the magnetic circuit is made up of a number of different parts.

·        The first is the air potion of the total gap. Being a non-contact device, there is always a space between the magnet surface and the sensor package. This space is required so that the two components are never in contact when in use. Because of various dimensional stack-ups in the system design, a maximum air gap would be expected under a worst case situation In some applications it is necessary for the sensor to be on the opposite side of a non-magnetic barrier than the target wheel is located.

·        The thickness of this non-magnetic barrier is a second source of gap that makes up the total gap.

·        The last source that makes up the total gap comes from the sensor itself. The magnetically active sensing element is located a small distance within the sensor package. This is required to protect the sensing device from physical damage. The data sheet for the sensor should indicate the package depth of the active element. If this value is not specified, contact the supplier.

The arithmetic sum of these three sources of gap will result in the total gap of the magnetic circuit. 

The graphs can be used in a number of different ways but there are four variables that are being investigated. The four variables are total gap, minimum magnetic field available (to operate the sensor), number of alternating magnetic poles and magnetic material. Any of these variable can be investigated to determine the most efficient design. The most important consideration when reviewing the options for a particular application is to keep the total gap as small as possible since the magnetic field rapidly decreases with the total gap. Another consideration is that a larger diameter magnet target will allow the operation at a larger total gap for the same number of poles.

P16B Magnetic Performance/Design Guide