|국가/구분||United States(US) Patent 등록|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 1 인용 특허 : 4|
A brushless DC tachometer including an alternator which produces a substantially trapezoidal output signal coupled to an FET transistor switching bridge. The trapezoidal output signal is achieved using a block permanent magnet for one pole and a consequent pole contoured to achieve a substantially uniform flux density for the winding over a distance sufficient to produce a trapezoidal output signal.
1. In a rotary electromagnetic machine, the combination of a magnetic structure including at least two poles, a block permanent magnet providing one of said poles, with a nonuniform gap spacing, and wherein the other one of said poles is a consequent pole structure; and at least one coil moving relative to said poles; said consequent pole being contoured to provide a nonuniform gap spacing relative to said moving coil so that the sum of the flux densities encountered by said coil moving relative to said consequent pole and the other of said pole...