Abstract: In the axial gap rotating electrical machine, the rotor includes a rotor yoke that is formed by wrapping amorphous ribbon wound toroidal core, which is obtained by winding an amorphous magnetic metal ribbon into a toroidal core. Magnets having plural poles are circumferentially disposed on a stator-facing surface of the amorphous ribbon wound toroidal core.

Abstract: There is provided a self-starting permanent magnet synchronous motor in which a center axis of magnetic poles of a rotor is assumed to be a d axis, an axis deviated from the magnetic pole center axis by an electric angle of 90 degrees is assumed to be a q axis, at least two or more starting bars which are arranged near the d axis are arranged on a bore side of the bars near the q axis and are arranged in parallel with the q axis, so that a stable starting torque can be generated irrespective of a generating position of a stator magnetic flux which changes due to applying timing of a power source and a phase of a voltage, and a vibration/noises at the time of a stationary operation can be reduced.

Abstract: In the axial gap rotating electrical machine, the rotor includes a rotor yoke that is formed by wrapping amorphous ribbon wound toroidal core, which is obtained by winding an amorphous magnetic metal ribbon into a toroidal core. Magnets having plural poles are circumferentially disposed on a stator-facing surface of the amorphous ribbon wound toroidal core.

Abstract: A self-starting type permanent magnet synchronous motor comprises a stator and a rotor. The rotor comprises a rotor core having a plurality of slots provided in an outer periphery thereof and a cage winding comprising conductive bars embedded in the slots and conductive end rings that short-circuit the conductive bars on both end faces of the bars in an axial direction thereof. The rotor core comprises at least one magnet insertion hole arranged on an inner peripheral side from the slots, and at least one permanent magnet embedded in the at least one magnet insertion hole. When a pole center axis is denoted as a d-axis and an axis deviating from the pole center axis by an electrical angle 90° is denoted as a q-axis, a flux content generated by the cage winding during start-up becomes maximal in the vicinity of and on one of the d-axis and the q-axis.

Abstract: There is provided a self-starting permanent magnet synchronous motor in which a center axis of magnetic poles of a rotor is assumed to be a d axis, an axis deviated from the magnetic pole center axis by an electric angle of 90 degrees is assumed to be a q axis, at least two or more starting bars which are arranged near the d axis are arranged on a bore side of the bars near the q axis and are arranged in parallel with the q axis, so that a stable starting torque can be generated irrespective of a generating position of a stator magnetic flux which changes due to applying timing of a power source and a phase of a voltage, and a vibration/noises at the time of a stationary operation can be reduced.

Abstract: The inventive self-initiated permanent magnet synchronous motor has a rotor that has two-pole permanent magnets, as well as magnetic substances in a peripheral direction between the magnetic poles of the permanent magnets. The present invention provides a high-efficiency, high-torque permanent magnet synchronous motor with an improved power factor, its rotor, and a compressor using the permanent magnet synchronous motor, without a reduction in the maximum torque and an increase in costs.

Abstract: A self-starting type permanent magnet synchronous motor comprises a stator and a rotor. The rotor comprises a rotor core having a plurality of slots provided in an outer periphery thereof and a cage winding comprising conductive bars embedded in the slots and conductive end rings that short-circuit the conductive bars on both end faces of the bars in an axial direction thereof. The rotor core comprises at least one magnet insertion hole arranged on an inner peripheral side from the slots, and at least one permanent magnet embedded in the at least one magnet insertion hole. When a pole center axis is denoted as a d-axis and an axis deviating from the pole center axis by an electrical angle 90° is denoted as a q-axis, a flux content generated by the cage winding during start-up becomes maximal in the vicinity of and on one of the d-axis and the q-axis.

Abstract: In a method of manufacturing a self-start synchronous motor for preventing deterioration of permanent magnets used in a rotor, and also for enhancing the efficiency of the self-start synchronous motor, the self-start synchronous motor comprising a stator having a stator core and windings wound around the stator core, and a rotor having an outer diameter slightly smaller than an inner diameter of the stator and arranged inside of the stator. The rotor is provided with a rotor core, a plurality of conductor bars embedded in the outer peripheral portion of the rotor core over an entire periphery thereof, end rings provided on opposite end sides of the conductor bars and constituting a squirrel cage conductor in cooperation with the conductor bars, and a plurality of permanent magnets embedded in the rotor core and arranged at a position inner than that of an inner peripheral surface of the conductor bars.

Abstract: The invention provides a motor comprising a stator and a rotor. The stator core includes a laminated stator core made of laminated stator core plates in which straight cut surfaces are formed on a circular outer peripheral surface of the laminated stator core plates. The straight cut surfaces of the laminated stator core plates are circumferentially displaced every predetermined laminated stator core plates so that the straight cut surfaces are uniformly distributed in an axial and a circumferential direction of the laminated stator core. Therefore, a flow passage for lubricating oil is ensured, while local magnetic saturation of the stator core is dissolved and a cogging torque and an induced voltage waveform distortion rate are improved.

Abstract: A permanent magnet synchronous motor includes a rotor having cage windings and permanent magnets placed on an inner peripheral side of these cage winding bars, where the permanent magnets are placed and polarized so that a ratio ?/? between a circumferential pitch angle ? of magnetic flux distribution of the permanent magnets and a magnet pole pitch angle ? is between 0.67 and 0.91.

Abstract: A self-starting permanent magnet synchronous motor which demonstrates satisfactory acceleration performance even at a reduced supply voltage or with an increased load torque, and a compressor using the same. The motor comprises a stator having a stator winding and a rotor having a cage winding and a permanent magnet on the rotor core. The torque component generated by the cage winding is maximal at 1 in the slip range of 0 to 1.

Abstract: The inventive self-initiated permanent magnet synchronous motor has a rotor that has two-pole permanent magnets, as well as magnetic substances in a peripheral direction between the magnetic poles of the permanent magnets. The present invention provides a high-efficiency, high-torque permanent magnet synchronous motor with an improved power factor, its rotor, and a compressor using the permanent magnet synchronous motor, without a reduction in the maximum torque and an increase in costs.

Abstract: A permanent magnet synchronous motor includes a rotor having cage windings and permanent magnets placed on an inner peripheral side of these cage winding bars, where the permanent magnets are placed and polarized so that a ratio ?/? between a circumferential pitch angle ? of magnetic flux distribution of the permanent magnets and a magnet pole pitch angle ? is between 0.67 and 0.91.

Abstract: In a method of manufacturing a self-start synchronous motor for preventing deterioration of permanent magnets used in a rotor, and also for enhancing the efficiency of the self-start synchronous motor, the self-start synchronous motor comprising a stator having a stator core and windings wound around the stator core, and a rotor having an outer diameter slightly smaller than an inner diameter of the stator and arranged inside of the stator. The rotor is provided with a rotor core, a plurality of conductor bars embedded in the outer peripheral portion of the rotor core over an entire periphery thereof, end rings provided on opposite end sides of the conductor bars and constituting a squirrel cage conductor in cooperation with the conductor bars, and a plurality of permanent magnets embedded in the rotor core and arranged at a position inner than that of an inner peripheral surface of the conductor bars.

Abstract: The invention provides a motor comprising a stator and a rotor. The stator core includes a laminated stator core made of laminated stator core plates in which straight cut surfaces are formed on a circular outer peripheral surface of the laminated stator core plates. The straight cut surfaces of the laminated stator core plates are circumferentially displaced every predetermined laminated stator core plates so that the straight cut surfaces are uniformly distributed in an axial and a circumferential direction of the laminated stator core. Therefore, a flow passage for lubricating oil is ensured, while local magnetic saturation of the stator core is dissolved and a cogging torque and an induced voltage waveform distortion rate are improved.

Abstract: A self-starting synchronous motor and a compressor including the motor are disclosed. The self-starting synchronous motor comprises at least a squirrel-cage conductor buried in the neighborhood of the outer peripheral portion of a rotor core, and a plurality of permanent magnets buried in the periphery inward of the squirrel-cage conductor. The armature winding for the stator is wound in concentrated way, and the two ends of each of the teeth are expanded to form at least a disuniform gap between the stator and the rotor. At least an arcuate permanent magnet is buried in the rotor, and a squirrel-cage conductor is buried also between the magnetic poles.

Abstract: A cooling apparatus has a heat exchanger for performing heat exchange between cooling water and fluid, and a flow rate regulator valve for regulating a flow rate of either the cooling water or the fluid which pass through the heat exchanger. A cooling temperature of the fluid is preset. A temperature of the cooled fluid is detected, and an opening degree of the flow rate regulator valve is changed when there is a difference between the detected temperature and the preset temperature. Simultaneously, either a temperature difference of the cooling water and the fluid or a flow rate of the cooling water is detected. The opening degree of the flow rate regulator valve is corrected or compensated on the basis of a result of the detection, thus enabling suitable temperature control of the fluid in accordance with a variation of the temperature or flow rate of the cooling water.

Abstract: There is disclosed a control system for controlling a refrigerating apparatus in which a control unit is arranged to calculate a super heat amount of a discharge gas of a compressor at the time immediately before starting operation of the compressor, on the basis of a difference between temperatures detected by a discharge gas temperature sensor and a condenser temperature sensor and to control an opening degree of an electronic expansion valve to a completely open state. After starting operation of the compressor, the control unit constantly measures the super heat amount of the discharge gas and controls the valve opening degree to the usual degree when the super heat amount becomes higher than the preset value.

Abstract: A control system for controlling cooling equipment comprising a refrigerant circuit for cooling water by heat exchange, a plurality of cooling modules in a backup relationship with an adjusting apparatus for adjusting the cooling capability of the refrigerant circuit and a controller controlling the adjusting apparatus for adjusting the cooling capability, a control module having a coolant temperature sensor and a controller for calculating a cooling capability control command based on the value detected by the coolant temperature sensor. The controller in one of the cooling modules controls the adjusting apparatus and on the cooling capability control commend transmitted from the controller in the control module.

Abstract: A water chilling apparatus comprising a plurality of chilling modules each having a refrigerating cycle mainly composed of a compressor, a condensor, an evaporator and an expansion mechanism, and a control module having a water pump for feeding, to an object to be chilled, chilling water cooled down by the evaporator of each chilling module, a detector for detecting a temperature of the chilling water and a water temperature controller. A chilling ability of each chilling module in response to a variable frequency is kept at substantially the same level. A capacity of the compressor of each chilling module is variably controlled in a range between an upper limit capacity and a lower limit capacity. The water temperature controller is used to calculate a whole necessary capacity value needed in the compressors of all the chilling modules as a function as a deviation between a set value of the chilling water temperature and a chilling water temperature detected by the detector.