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US 5,327,064 AGranted
Brushless motor incorporating an integrated circuit having a single chip peripheral circuit
AssigneeHitachi, Ltd.
InventorsNoriaki Arakawa, Makoto Isii, Yasutsugu Kawaguchi
Life of this patent
Estimating the term…
Abstract
A brushless motor accommodated within a case and having mounted on a substrate rotor speed detection sensors and a monolithic integrated circuit which includes an inverter for driving the rotor, drive circuits for driving the inverter, power source circuit for supplying a power required by each circuit, circuits for controlling the speed of the rotor and a protection circuit for protecting the inverter from excess current.
Claims11
A brushless motor comprising:
- a first case member;
- a second case member cooperating with said first case member to form a motor casing;
- and
- accommodated in said motor casing:
- (a) a rotor;
- (b) a stator attached to said first case member;
- (c) a commercial power source connection for receiving commercial AC power;
- (d) an integrated circuit within said second case member so as to be separated from said stator, and including an inverter for rotatingly driving said rotor, a drive circuit for driving said inverter, a control circuit for controlling the speed of said rotor, a protection circuit for protecting said inverter from excess current, and a power converter connected to said commercial power source connection for converting the received commercial AC power to power for supplying to said drive circuit;
- (e) speed detection means for detecting the speed of said rotor, said speed detection means connected to said integrated circuit;
- (f) a substrate having mounted thereon said integrated circuit and said speed detection means;
- and
- (g) heat radiation means within said second case member and closely connected to said integrated circuit.
9 more elements
A brushless motor comprising:
- a first case member;
- a second case member cooperating with said first case member to form a motor casing;
- and
- accommodated in said motor casing:
- (a) a rotor;
- (b) a stator attached to said first case member;
- (c) an integrated circuit within said second case member so as to be separated from said stator, and including a high voltage inverter for inverting a voltage of at least 100 volts to rotatingly drive said rotor, a high voltage drive circuit for driving said inverter, a control circuit for controlling the speed of said rotor, a protection circuit for protecting said inverter from excess current, and a power source circuit for supplying power to said drive circuit;
- (d) speed detection means for detecting the speed of said rotor, said speed detection means connected to said integrated circuit;
- (e) a substrate having mounted thereon said integrated circuit and said speed detection means;
- and
- (f) heat radiation means within said second case member and closely connected to said integrated circuit.
8 more elements
Dependencies are inferred from the claim text.