Electric motor with insulated permanent magnet

A method of manufacturing a rotor for an electric motor, the method comprising:

• positioning a permanent magnet within a magnet hole formed in a rotor body, wherein the rotor body and the permanent magnet are to form a rotor for an electric motor;
• providing an electrically insulating layer between the permanent magnet and a surface of the rotor body, wherein the surface at least partially defines the magnet hole;
• performing an electrical continuity test on the permanent magnet and the rotor body, the electrical continuity test performed while the permanent magnet is within the magnet hole and the electrically insulating layer is between the permanent magnet and the surface of the rotor body;
• determining, based on the electrical continuity test, whether the electrically insulating layer provides at least a threshold electric insulation between the permanent magnet and the rotor body, the threshold electric insulation corresponding to prevention of eddy currents circulating between the permanent magnet and the rotor body;
• and
• based on the electrically insulating layer providing at least the threshold electric insulation between the permanent magnet and the rotor body, approving the rotor for the electric motor.