REQUIRED MAGNETIZING FIELDS
- May 15, 2019-
Bonded rare earth magnets pose another problem. The magnetic powder is separated with non-magnetic binder which affects the penetration of flux through the magnet during the pulse and requires a higher magnetic field than one would expect from the rule above. For example, MQP-B powder with an Hci of 10,000 Oersteds requires at least 30,000 Oersteds to saturate. Most magnet manufacturers should be able to provide you with a curve of peak applied field versus percent of saturation for induction, Hci or percent of maximum flux output.
Approximate required magnetizing fields for various magnet types to reach at least 98% of maximum output are listed below. These are general and affected by fixturing and LC circuit, etc.