Foley & Lardner
Magnet rotor for synchronous motor
 A magnet rotor for a synchronous motor includes a yoke formed of a magnetic material. A generally cylindrical permanent magnet is disposed around the yoke magnet and has N and S poles alternately located in the circumferential direction of the permanent magnet. An adhesive is filled in the clearance between the outer peripheral surface of the yoke and the inner peripheral surface of the permanent magnet. The adhesive is hardened at a hardening temperature, which is around a maximum temperature encountered during operation of the motor to accomplish bonding between the yoke and the permanent magnet. The clearance between the yoke and the permanent magnet has a dimension L given by the following formula: EQU L.gtoreq.(E.times..DELTA.L) / .sigma.s where E is a tensile elastic modulus of the adhesive; .DELTA.L is a change amount of the clearance upon thermal expansion or contraction; and .sigma.s is a tensile stress applied to the adhesive. 
Nissan Motor Co. Ltd.
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inventional inventional inventional
Shigenori Takao Hiroyuki Hiyoshi Kenji
Kinoshita Yanase Hirano Yamada Endo