Magnet management in electric machines

摘要

A magnet management method of controlling a ferrite-type permanent magnet electrical machine includes receiving and/or estimating the temperature permanent magnets; determining if that temperature is below a predetermined temperature; and if so, then: selectively heating the magnets in order to prevent demagnetization and/or derating the machine. A similar method provides for controlling magnetization level by analyzing flux or magnetization level. Controllers that employ various methods are disclosed. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.

主权项

1. A method of controlling an electrical machine, the method comprising:
measuring one of flux information and temperature information of a plurality of ferrite-type permanent magnets of a motor; sending back-emf-information from an operating point control module in communication with the motor to a magnet management module, wherein the magnet management module:
receives of one the flux information and the temperature information;determines if the temperature is below a predetermined temperature; and if so, then perform at least one of the following:selectively heats the plurality of ferrite-type permanent magnets in order to prevent demagnetization of the plurality of ferrite-type permanent magnets; and
derates the electrical machine.