Patent ID: 6198184
Filing Date: 2001-03-06
Classification: H01H,H02H,H02K,H05K,Y10S

Abstract:
A motor, comprising:a rotary shaft;a rotor secured to said rotary shaft;a stator positioned between said rotary shaft and said rotor;a plurality of coils wound around said stator;a plurality of magnets secured to an inner circumferential surface of said rotor and opposed to said plurality of coils for generating a magnetic field to cause rotation of said rotor relative to said stator;a drive circuit including at least one switch device to switch a direction of current supplied to said coils, and a source supply line electrically connected to said at least one switch device;a circuit board supporting said drive circuit, and a housing, wherein said circuit board is contained within said housing;a protection device including an arch-shaped resilient plate of an electrically conductive material electrically interconnecting said source supply line with said at least one switch device via a solder material that melts at a specific temperature in response to heat generated at said at least one switch device to break said drive circuit by breaking the electrical connection between said source supply line and said at least one switch device, with one end of said arch-shaped resilient plate being electrically connected to a first portion of said drive circuit and a second end of said arch-shaped resilient plate being electrically connected to a second portion of said drive circuit such that said arch-shaped resilient plate electrically interconnects said source supply line with said at least one switch device, and wherein a portion of said second end of said arch-shaped resilient plate passes through an opening in said circuit board such that said second end is mechanically attached to said circuit board; anda heat radiator to transfer heat from said at least one switch device, wherein said protection device is located adjacent to said heat radiator.