Driving device

A driving device comprising:

• a rotor unit including a rotation shaft, a fluid supplying portion, and a motor rotor, wherein
• the rotation shaft includes a first end portion, a second end portion, and a middle portion,
• the fluid supplying portion is arranged at the first end portion of the rotation shaft, and
• the motor rotor is arranged at the second end portion of the rotation shaft;
• a housing including a first end portion, a second end portion, and a support portion, which rotatably supports the middle portion of the rotation shaft, wherein the first end portion includes a supplying chamber that accommodates the fluid supplying portion;
• and
• a stator case arranged adjacent to the second end portion of the housing, wherein the stator case accommodates a motor stator and a motor rotor arranged in the motor stator, and the motor stator fixed to the stator housing, wherein
• the motor rotor forms a consequent pole rotor including a motor rotor core and a plurality of magnets arranged along a circumferential direction of the motor rotor core,
• the magnets form a plurality of magnetic pole portions each serving as a primary magnetic pole,
• the motor rotor core includes a portion located between adjacent ones of the magnetic pole portions in the circumferential direction that defines a magnetic-pole-forming portion serving as a secondary magnetic pole,
• the motor unit includes a magnetization inhibiting portion formed to inhibit magnetization of the fluid supplying portion, and
• the support portion of the housing includes a nonmagnetic metal.