Abstract: A stator includes a core body provided so as to contact a substantially cylindrical peripheral-wall inner surface of a frame and having a stator coil wound thereupon, and a mold portion in which a coil end of the stator coil is molded out of resin. A gap is provided between the peripheral-wall inner surface and the mold portion.

Abstract: A press machine includes a cushion shaft, a press shaft, a motor, and a motor control device. The cushion shaft is connected to a lower die. The press shaft is connected to an upper die and configured to press a workpiece between the upper die and the lower die in cooperation with the cushion shaft. The motor is configured to drive the upper die. The motor control device is configured to control the motor and includes a disturbance observer and an intrusion detector. The disturbance observer is configured to calculate an estimated disturbance value with respect to the motor based on a torque command and a motor velocity of the motor. The intrusion detector is configured to detect, based on the estimated disturbance value, a state of a foreign object between the press shaft and the cushion shaft.

Abstract: A press machine includes a cushion shaft, a press shaft, a motor, and a motor control device. The cushion shaft is connected to a lower die. The press shaft is connected to an upper die and configured to press a workpiece between the upper die and the lower die in cooperation with the cushion shaft. The motor is configured to drive the upper die. The motor control device is configured to control the motor and includes a disturbance observer and an intrusion detector. The disturbance observer is configured to calculate an estimated disturbance value with respect to the motor based on a torque command and a motor velocity of the motor. The intrusion detector is configured to detect, based on the estimated disturbance value, a state of a foreign object between the press shaft and the cushion shaft.