Electric motor, compressor, and refrigeration device

An electric motor comprising:

• a rotor;
• and
• a stator, the stator including
• a stator core including a back yoke in a circular shape and a plurality of teeth protruding radially inward of the back yoke,
• a suspension winding group including a plurality of suspension windings wound on the teeth so as to pass through slots, each formed between the plurality of teeth, the suspension windings generating an electromagnetic force that supports the rotor in a non-contact manner due to passage of current, and the suspension windings generating a magnetic pole inside the stator, and
• an armature winding group including a plurality of armature windings wound on the teeth so as to pass through the slots, each formed between the plurality of teeth, the armature windings generating an electromagnetic force that rotationally drives the rotor by passage of current, and the armature windings generating a magnetic pole inside the stator,
• one of the suspension winding group or the armature winding group including a plurality of series winding sets that each include a plurality of windings of a same phase connected together in series,
• each of the series winding sets being connected in parallel with an other one of the series winding sets including the plurality of windings having a different winding axis from and being of a same phase as that of the plurality of windings included in the series winding sets,
• each of the series winding sets including one or more sub-winding sets, and each of the one or more sub-winding sets includes k windings arranged such that winding axes of the windings adjacent to each other form an angle of 360°/k,
• the suspension winding group and the armature winding group being wired so that a total voltage of induced voltages produced in the windings included in each of the series winding sets by a change in the current flowing through the other winding group and a change in a magnet magnetic flux corresponds to a voltage across the series winding set, and
• a maximum value of an absolute value of a difference between induced voltages appearing individually in the plurality of series winding sets of the same phase connected together in parallel based on a magnetic flux generated when a current flows through the other winding group being less than a maximum value of an absolute value of a difference between induced voltages appearing individually in the windings included in the plurality of series winding sets of the same phase connected together in parallel based on the magnetic flux generated when a current flows through the other winding group.