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US 5,107,155 AGranted
Vibrator motor for wireless silent alerting device
AssigneeTokyo Parts Industrial Co., Ltd.
InventorTadao Yamaguchi
Life of this patent
Estimating the term…
Abstract
A small dc vibrator motor for use in a wireless alerting device includes a housing, a non-rotatable shaft fixed to the housing, a cylindrical magnet fixedly mounted on the shaft, and a rotor which is rotatably mounted on the shaft. The rotor includes a cylindrical coreless winding assembly between the magnet and the housing, and eccentric bearings, or combinations of concentric bearings and eccentric weights, on both ends of the winding assembly. The eccentric bearings, or the combinations of concentric bearings and eccentric weights, cause vibrations when the rotor rotates.
Claims28
A dc vibrator motor for use in a wireless silent alerting device, comprising:
- (a) a housing including a electrically-magnetically-conductive case;
- (b) a magnetically-conductive shaft which is non-rotatably fixed to said housing;
- (c) a cylindrical permanent magnet fixedly mounted on said shaft;
- (d) a rotor which is rotatably mounted on said shaft, said rotor including:
- a cylindrically-shaped coreless winding assembly having a first end a second end, said coreless winding assembly being disposed in an air gap formed between said housing and said permanent magnet,
- a first holder fixedly attached to said winding assembly on the first end thereof, said first holder having a first lubricant-containing eccentric bearing rotatably mounted on said shaft, and
- a second holder fixedly attached to said winding assembly on the second end thereof, said second holder having a second lubricant-containing eccentric bearing rotatably mounted on said shaft, the center of mass of each of said first and second eccentric bearings being off the axis of said shaft so that said first and second bearings cause vibrations when said rotor is rotated;
- and
- (e) means for supplying dc currents to said winding assembly.
6 more elements
A dc vibrator motor for use in a wireless silent alerting device, comprising:
- (a) a housing including a electrically-magnetically-conductive case;
- (b) a magnetically-conductive shaft which is non-rotatably fixed to said housing;
- (c) a cylindrical permanent magnet fixedly mounted on said shaft;
- (d) a rotor which is rotatably mounted on said shaft, said rotor including:
- a cylindrically-shaped coreless winding assembly having a first end and a second end said coreless winding assembly being disposed in an air gap formed between said housing and said cylindrical permanent magnet,
- a first holder fixedly attached to said winding assembly on the first end thereof, said first holder having a first lubricant-containing concentric bearing rotatably mounted on said shaft and a first eccentric weight, and
- a second holder fixedly attached to said winding assembly on the second end thereof, said second holder having a second lubricant-containing concentric bearing rotatably mounted on said shaft and a second eccentric weight, the center of mass of each of said first and second eccentric weights being off the axis of said shaft so that said first and second eccentric weights cause vibrations when said rotor is rotated;
- and
- (e) means for supplying dc currents to said winding assembly.
6 more elements
A dc vibrator motor for use in a wireless silent alerting device, comprising:
- (a) a housing including a electrically-magnetically-conductive case;
- (b) a shaft which is non-rotatably fixed to said housing;
- (c) a magnetically-conductive tube fixedly mounted on said shaft;
- (d) a cylindrical permanent magnet fixedly mounted on said magnetically-conductive tube;
- (e) a rotor which is rotatably mounted on said shaft, said rotor including:
- a cylindrically-shaped coreless winding assembly having a first end and a second end, said coreless winding assembly being disposed in an air gap formed between said housing and said permanent magnet,
- a first holder fixedly attached to said winding assembly on the first end thereof, said first holder having a first lubricant-containing eccentric bearing rotatably mounted on said shaft, and
- a second holder fixedly attached to said winding assembly on the second end thereof, said second holder having a second lubricant-containing eccentric bearing rotatably mounted on said shaft, the center of mass of each of said first and second eccentric bearings being off the axis of said shaft so that said first and second bearings cause vibrations when said rotor is rotated;
- and
- (f) means for supplying dc currents to said winding assembly.
7 more elements
A dc vibrator motor for use in a wireless silent alerting device, comprising:
- (a) a housing including a electrically-magnetically-conductive case;
- (b) a shaft which is non-rotatably fixed to said housing;
- (c) a magnetically-conductive tube fixedly mounted on said shaft;
- (d) a cylindrical permanent magnet fixedly mounted on said magnetically-conductive tube;
- (e) a rotor which is rotatably mounted on said shaft, said rotor including:
- a cylindrically-shaped coreless winding assembly having a first end and a second end, said coreless winding assembly being disposed in an air gap formed between said housing and said cylindrical permanent magnet,
- a first holder fixedly attached to said winding assembly on the first end thereof, said first holder having a first lubricant-containing concentric bearing rotatably mounted on said shaft and a first eccentric weight, and
- a second holder fixedly attached to said winding assembly on the second end thereof, said second holder having a second lubricant-containing concentric bearing rotatably mounted on said shaft and a second eccentric weight, the center of mass of each of said first and second eccentric weights being off the axis of said shaft so that said first and second eccentric weights cause vibrations when said rotor is rotated;
- and
- (f) means for supplying dc currents to said winding assembly.
7 more elements
Dependencies are inferred from the claim text.