Patent ID: 7235966
Filing Date: 2007-06-26
Classification: G01D

Abstract:
1. A resolver unit comprising: an inner frame in which a cylinder portion is continuously disposed on a periphery of a disk portion; an outer frame in which an outer cylinder portion is continuously disposed on an outer periphery of an annular plate portion, and an inner cylinder portion is continuously disposed on an inner periphery of said annular plate portion; a rotary transformer comprising an outer portion and an inner portion, wherein said outer portion comprises an annular outer transformer coil and an annular outer transformer yoke, and said inner portion comprises an annular inner transformer coil and an annular inner transformer yoke; a resolver body comprising an inner portion and an outer portion, wherein said inner portion comprises a plurality of inner magnetic pole portions having an inner coil on an annular inner yoke, and said outer portion comprises a plurality of outer magnetic pole portions having an outer coil on an annular outer yoke, wherein said outer and inner portions of said rotary transformer are paired and opposingly placed, said outer and inner portions of said resolver body are paired and opposingly placed, one of said outer portion of said rotary transformer and said outer portion of said resolver body is disposed on a radially inner side face of said cylinder portion of said inner frame, one of said inner portion of said rotary transformer and said inner portion of said resolver body is disposed on a radially outer side face of said inner cylinder portion of said outer frame, said one being paired with and opposed to said outer portion which is disposed on said radially inner side face of said cylinder portion of said inner frame, the other one of said inner portion of said rotary transformer and said inner portion of said resolver body is disposed on a radially outer side face of said cylinder portion of said inner frame, said other one being not paired with said outer portion which is disposed on said radially inner side face of said cylinder portion of said inner frame, and one of said outer portion of said rotary transformer and said outer portion of said resolver body is disposed on a radially inner side face of said outer cylinder portion of said outer frame, said one being paired with and opposed to said inner portion which is disposed on said radially outer side face of said cylinder portion of said inner frame.