System and method for heating ferrite magnet motors for low temperatures
First Claim
1. A permanent magnet machine comprising:
- a stator assembly comprising at least one stator winding;
a rotor assembly configured to rotate relative to the stator assembly;
a plurality of ferrite permanent magnets disposed within the stator assembly;
a temperature measuring device configured to monitor the temperature of the plurality of ferrite permanent magnets;
a heating device configured to heat the plurality of ferrite permanent magnets when the monitored temperature of the plurality of ferrite permanent magnets falls below a threshold temperature; and
a controller programmed to;
receive feedback from the temperature measuring device regarding the monitored temperature of the plurality of ferrite permanent magnets; and
control operation of the heating device to heat the plurality of ferrite permanent magnets when the monitored temperature of the plurality of ferrite permanent magnets falls below the threshold temperature.
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Accused Products
Abstract
A system and method for heating ferrite permanent magnets in an electrical machine is disclosed. The permanent magnet machine includes a stator assembly and a rotor assembly, with a plurality of ferrite permanent magnets disposed within the stator assembly or the rotor assembly to generate a magnetic field that interacts with a stator magnetic field to produce a torque. A controller of the electrical machine is programmed to cause a primary field current to be applied to the stator windings to generate the stator magnetic field, so as to cause the rotor assembly to rotate relative to the stator assembly. The controller is further programmed to cause a secondary current to be applied to the stator windings to selectively generate a secondary magnetic field, the secondary magnetic field inducing eddy currents in at least one of the stator assembly and the rotor assembly to heat the ferrite permanent magnets.
74 Citations
19 Claims
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1. A permanent magnet machine comprising:
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a stator assembly comprising at least one stator winding; a rotor assembly configured to rotate relative to the stator assembly; a plurality of ferrite permanent magnets disposed within the stator assembly; a temperature measuring device configured to monitor the temperature of the plurality of ferrite permanent magnets; a heating device configured to heat the plurality of ferrite permanent magnets when the monitored temperature of the plurality of ferrite permanent magnets falls below a threshold temperature; and a controller programmed to; receive feedback from the temperature measuring device regarding the monitored temperature of the plurality of ferrite permanent magnets; and control operation of the heating device to heat the plurality of ferrite permanent magnets when the monitored temperature of the plurality of ferrite permanent magnets falls below the threshold temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A permanent magnet machine comprising:
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a rotor assembly configured to rotate about a central axis; a stator assembly positioned about the rotor assembly, the stator assembly comprising at least one stator winding; a plurality of ferrite permanent magnets disposed within the rotor assembly; a temperature measuring device configured to monitor the temperature of the plurality of ferrite permanent magnets; a heating element configured to heat the plurality of ferrite permanent magnets when the monitored temperature of the plurality of ferrite permanent magnets falls below a threshold temperature; and a controller programmed to; receive feedback from the temperature measuring device regarding the monitored temperature of the plurality of ferrite permanent magnets; and control operation of the heating device to heat the plurality of ferrite permanent magnets when the monitored temperature of the plurality of ferrite permanent magnets falls below the threshold temperature. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification