초록 ▼

A polyphase brushless DC motor has an integral automatic feedback arrangement and a high degree of magnetic balance. The stator pole elements of the motor are identical and equidistantly spaced, and the coils with which they are wound are connected as pairs; the pole elements in most of the armature

A polyphase brushless DC motor has an integral automatic feedback arrangement and a high degree of magnetic balance. The stator pole elements of the motor are identical and equidistantly spaced, and the coils with which they are wound are connected as pairs; the pole elements in most of the armature pairs are directly adjacent one another. The sensor means has at least two circuit legs, each being connected to paired pole elements of the stator to provide a sensor channel, the channels cooperating to provide highly accurate rotor position feedback information.

대표청구항 ▼

A polyphase, direct current electric motor, or the like, comprising: a stator of magnetic material comprising a generally cylindrical body portion and a multiplicity of identical pole elements extending radially from said body portion at locations spaced thereabout, and a corresponding multiplicity

A polyphase, direct current electric motor, or the like, comprising: a stator of magnetic material comprising a generally cylindrical body portion and a multiplicity of identical pole elements extending radially from said body portion at locations spaced thereabout, and a corresponding multiplicity of coils wound about said pole elements; sensor means having at least two electrical circuit legs, one of said circuit legs being connected to said coils on a first pair of said pole elements and the other of said two circuit legs being connected to said coils on a second pair of said pole elements, said pole elements of said first pair being disposed on said body portion in a non-interposed relationship with said pole elements of said second pair, said sensor means-connected coils adapting the associated pole elements to function in pairs as sensor poles, providing at least two sensor channels for the generation of signals indicative of the angular orientation of a rotor assembled with said stator; and power supply means for providing at least two phases of current, said supply means having one circuit portion connecting said coils wound about a first plurality of said pole elements in series for energization by one phase of current, and having another circuit portion connecting said coils wound about a second plurality of said pole elements in series for energization by a second phase of current, said one and another circuit portions of said supply means, so connected, adapting the associated pole elements to function as first and second phase torque poles, respectively, the total number of said pole elements on said body portion divided by the number of phases provided by said power supply means being an even number, said first and second phase torque poles being interposed with one another and disposed with respect to said sensor poles, about said body portion, so as to provide a magnetically balanced configuration when said torque poles are energized.