Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-12-22
2000-02-15
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 86, 310 93, 310104, 310105, 464 29, 192 843, 188267, 188158, 188161, 188164, H02K 710
Patent
active
060256648
ABSTRACT:
A vehicle braking system including a brake drum connected to a rotational shaft; an annular member formed of a ferromagnetic material; a guide frame for supporting the annular member in a position within said spaced from an inner surface of the brake drum; and a cylindrical body defining an uninterrupted wall between the inner surface of the brake drum and the annular member; at least portions of the cylindrical body disposed directly between the inner surface of the brake drum and outer surfaces of the permanent magnets being formed from a magnetically permeable material. Also included are a plurality of annularly arranged permanent magnets circumferentially spaced apart in positions of uniform pitch, the polarities of the permanent magnets facing the inner surface of said brake drum alternating circumferentially; and an actuator for producing axial movement of the annularly arranged permanent magnets into active positions within the brake drum and between the inner surface of the brake drum and the annular member, and inactive positions out of the brake drum. The provision of the cylindrical body with magnetically permeable portions reduces the non-magnetic gap between the brake drum and magnets to thereby increase braking torque.
REFERENCES:
patent: 5054587 (1991-10-01), Matsui et al.
patent: 5064029 (1991-11-01), Araki et al.
patent: 5143183 (1992-09-01), Kuwahara
patent: 5145038 (1992-09-01), Kuwahara
patent: 5219050 (1993-06-01), Kubomiya
patent: 5238095 (1993-08-01), Pedu
patent: 5303802 (1994-04-01), Kuwahara
patent: 5804897 (1998-09-01), Kuwahara
patent: 5855256 (1999-01-01), Kuwahara
Dougherty Thomas M.
Isuzu Motors Limited
Jarcho Harold G.
Lam Thanh
Toupal John E.
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