Abstract: A non-excited operation type electromagnetic brake control device and method which are free from vibration noise and frequent switching when reducing average current which flows through a brake coil in a holding state of a non-excited operation type electromagnetic brake are provided. An acute triangle voltage wave generation unit generates a stepped acute triangle voltage wave which is formed by valley parts with a first angle and peak parts with a second angle smaller than the first angle arranged alternatively. A comparative voltage wave generation unit generates a comparative voltage wave based on current which flows through the brake coil. A comparison unit compares the acute the triangle voltage wave with the comparative voltage wave when the non-excited operation type electromagnetic brake is in the holding state.

Abstract: A control device for a hoist, which enables easy judgment of the lifetime of a brake of a hoist is provided. The time setting unit sets the time from startup of a double winding induction motor to disengagement of the brake and the time from start of engagement of the brake to stopping of the double winding induction motor in accordance with the time from the startup of the double winding induction motor to generation of torque. The time changing unit detects if power-supply frequency of a power supply is 50 Hz or 60 Hz and can change at least one of the time from the startup of the double winding induction motor to the disengagement of the brake and the time from stopping of driving of the brake to stopping of double winding induction motor in accordance with the power-supply frequency of the power supply.

Abstract: A non-excited operation type electromagnetic brake control device and method which are free from vibration noise and frequent switching when reducing average current which flows through a brake coil in a holding state of a non-excited operation type electromagnetic brake are provided. An acute triangle voltage wave generation unit generates a stepped acute triangle voltage wave which is formed by valley parts with a first angle and peak parts with a second angle smaller than the first angle arranged alternatively. A comparative voltage wave generation unit generates a comparative voltage wave based on current which flows through the brake coil. A comparison unit compares the acute the triangle voltage wave with the comparative voltage wave when the non-excited operation type electromagnetic brake is in the holding state.

Abstract: A control device for a hoist, which enables easy judgment of the lifetime of a brake of a hoist is provided. The time setting unit sets the time from startup of a double winding induction motor to disengagement of the brake and the time from start of engagement of the brake to stopping of the double winding induction motor in accordance with the time from the startup of the double winding induction motor to generation of torque. The time changing unit detects if power-supply frequency of a power supply is 50 Hz or 60 Hz and can change at least one of the time from the startup of the double winding induction motor to the disengagement of the brake and the time from stopping of driving of the brake to stopping of double winding induction motor in accordance with the power-supply frequency of the power supply.

Abstract: A dynamoelectric machine having a stator which is composed of a stator core formed of a mold resin containing silicon steel powder, and a magnetic field generating coil having coil turns arranged to generate sine-wave magnetic fields and embedded in the mold resin of the stator core. The coil ends of the coil turns of the magnetic field generating coil are bent so as to extend along both side surfaces of the stator core. Disclosed also is a method of producing this stator.