Abstract: A rotor yoke includes plural rotor cores having a disk shape laminated to be formed in a cylindrical shape, plural magnet inserting holes each including a longitudinal side and a transverse side, penetrated in a laminating direction of the rotor yoke, a bridge portion arranged between the magnet inserting holes adjacent to one another in a circumferential direction of the rotor cores and connecting an inner area to an outer area, a recessed portion arranged at the bridge portion and formed from the outer circumferential surface of the rotor cores toward radially inward and a protruding edge protruding toward an inside of the magnet inserting hole.

Abstract: A rotor yoke includes plural rotor cores having a disk shape laminated to be formed in a cylindrical shape, plural magnet inserting holes each including a longitudinal side and a transverse side, penetrated in a laminating direction of the rotor yoke, a bridge portion arranged between the magnet inserting holes adjacent to one another in a circumferential direction of the rotor cores and connecting an inner area to an outer area, a recessed portion arranged at the bridge portion and formed from the outer circumferential surface of the rotor cores toward radially inward and a protruding edge protruding toward an inside of the magnet inserting hole.

Abstract: To provide an electric pump that does not easily suffer malfunction of its driver due to vibration and whose components can be reduced in number, an electric pump includes a pump unit, a motor unit for driving the pump unit, and a driver chamber having a driver for controlling the pump unit. At least a space inside the driver chamber on one side of a substrate of the driver is filled with an amount of potting material for anchoring the substrate, whereas a space inside the driver chamber on the other side of the substrate is left as an unfilled space free from filling with potting material along the face direction of the substrate.