Brushless motor
First Claim
1. A brushless motor comprising:
- a stator comprising a plurality of exciting coils which receives drive current;
a rotor rotatable relative to the stator;
a first circuit section comprising a filter circuit for eliminating surges of electric power for the drive current, the first circuit section being produced on a wiring metal piece;
a second circuit section comprising a control circuit for controlling the magnetic field generated by the stator by controlling the drive current, the second circuit section being produced on a printed wiring board; and
a fuse member electrically connecting the wiring metal piece of the first circuit section and a wiring pattern formed on the printed wiring board of the second circuit section, the fuse member electrically disconnecting the wiring metal piece and the wiring pattern when a temperature of the wiring pattern becomes higher than a predetermined temperature.
1 Assignment
0 Petitions
Accused Products
Abstract
A brushless motor for a blower fan unit has a circuit structure constituted by a drive control circuit and a fuse member. The drive control circuit supplying drive current comprises a first circuit section for eliminating surges of electric power and a second circuit section for controlling magnetic field generated by the stator. The first and second circuit sections are three-dimensionally arranged with a predetermined space therebetween. The fuse member electrically connects the first and second circuit sections. An end portion of the fuse member is welded with the first circuit section, and the other end portion of the fuse member is soldered with the second circuit section. The fuse member cuts an electrical connection between the first and second circuit sections when a temperature of solder becomes higher than a predetermined temperature.
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Citations
15 Claims
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1. A brushless motor comprising:
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a stator comprising a plurality of exciting coils which receives drive current;
a rotor rotatable relative to the stator;
a first circuit section comprising a filter circuit for eliminating surges of electric power for the drive current, the first circuit section being produced on a wiring metal piece;
a second circuit section comprising a control circuit for controlling the magnetic field generated by the stator by controlling the drive current, the second circuit section being produced on a printed wiring board; and
a fuse member electrically connecting the wiring metal piece of the first circuit section and a wiring pattern formed on the printed wiring board of the second circuit section, the fuse member electrically disconnecting the wiring metal piece and the wiring pattern when a temperature of the wiring pattern becomes higher than a predetermined temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A brushless motor comprising:
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a stator comprising a plurality of exciting coils which receives drive current;
a rotor rotatable relative to the stator;
a drive control circuit supplying the drive current to the exciting coils, the drive control circuit comprising a first circuit section for eliminating surges of electric power and a second circuit section for controlling magnetic field generated by the stator by controlling drive current treated in the first circuit section, the first circuit section and second circuit section being arranged generally in parallel with a predetermined space therebetween; and
a fuse member electrically connecting the first circuit section and the second circuit section, an end portion of the fuse member being welded with the first circuit section, the other end portion of the fuse member being soldered with second circuit section, the fuse member cutting an electrical connection between the first circuit section and the second circuit section when a temperature of a part of the second circuit section becomes higher than a predetermined temperature.
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15. A circuit structure of a brushless motor, comprising;
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a drive control circuit supplying drive current to exciting coils of a stator of the brusless motor, the drive control circuit comprising a first circuit section for eliminating surges of electric power and a second circuit section for controlling magnetic field generated by the stator by controlling drive current passed through the first circuit section in order to control a rotation of a rotor of the brushless motor, the first and second circuit sections being three-dimensionally arranged with a predetermined space therebetween; and
a fuse member comprising a first end portion welded with the first circuit section, a second end portion soldered with the second circuit section and an intermediate elastic portion which is elastically deformed when the second end portion is soldered with the second circuit section, the second end portion being released from the second circuit section when solder connecting the second end portion and the second circuit section is melted.
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Specification