Armature and driving device

A driving device comprising:

• a plurality of coils that generate power according to a flowing current;
• a covering member that covers the plurality of coils from an outside, insulates the plurality of coils from each other to prevent outgas from releasing, and reduces outgas to the outside;
• a cooling unit that cools the plurality of coils;
• and
• a vacuum chamber that accommodates the plurality of coils, the covering member, and the cooling unit inside the vacuum chamber in a vacuum state,
• wherein the cooling unit has a plate shape having a first surface and a second surface, the plurality of coils being provided on both a first surface side and a second surface side of the cooling unit,
• the covering member includes an insulating member formed of a resin material and a coating film formed of an inorganic material with electrical insulation properties,
• the insulating member covers, from the outside, the coils on the first surface side and the second surface side, and a part of the cooling unit together to insulate the plurality of coils from each other,
• the insulating member is configured to prevent an electrical discharge between a coil provided on the first surface side and a coil provided on the second surface side facing each other with the cooling unit interposed therebetween, and the coating film is configured to cover the outside of the insulating member to suppress release of outgas to the outside,
• the cooling unit includes a flow path through which a refrigerant for cooling the coils flows, and
• the flow path is arranged to span adjacent coils provided on the first surface side and the second surface side.