Abstract: An apparatus for controlling a speed of a fan motor of an air-conditioner includes a frequency and voltage phase converter for simultaneously varying a voltage phase and frequency of a commercial AC power according to a control signal and applying a voltage varied according to the varied frequency and voltage phase to a fan motor of the air-conditioner; a zero voltage detector for receiving the commercial AC power and detecting a zero voltage of a voltage wave of the commercial AC power; and a microcomputer electrically connected with the zero voltage detector and the frequency and voltage phase converter, generating the control signal providing a predetermined frequency switching pattern according to a frequency command based on a point when the zero voltage is generated, and outputting the control signal to the frequency and voltage phase converter.

Abstract: A single-phase induction motor comprises a stator having a stator coil; an induction cage rotor rotatably inserted into a receiving groove of the stator, having a rotation shaft at a center thereof, having a plurality of first conductor bars at an outer peripheral portion thereof with the same interval in a circumferential direction, having a protrusion portion at an outer circumferential surface thereof, and having a plurality of second conductor bars installed at the protrusion portion in a circumferential direction; and a permanent magnet rotor free-rotatably installed between the stator and the induction cage rotor.

Abstract: A speed control system of a fan motor of an air conditioner is disclosed. A speed control system of a fan motor of an air conditioner comprises: an inverter having a power output terminal connected to a single-phase power input terminal of the fan motor which has a single-phase stator including a main coil and a sub coil, an induction rotor and a permanent magnet rotor installed between the stator and the induction rotor; and a three-phase driving motor connected to the power output terminal of the inverter and driving a compressor of an air conditioner by power received from the inverter.

Abstract: A single phase induction motor includes a stator, an induction cage rotor rotatably installed in a center portion of the stator and having a shaft fixed at its center; and a permanent magnet freely rotatably installed between the stator and the induction cage rotor and having a first magnetization portion and a second magnetization portion.

Abstract: A motor controller is capable of swiftly driving a motor at the initial stage and driving the motor with high efficiency and low power consumption after swiftly driving the motor at the initial stage by including a first capacitor connected in series with a common terminal to which the main coils and the sub-coils of the motor are connected and a PTC thermistor (Positive Temperature Coefficient thermistor) connected in parallel with the first capacitor.

Abstract: A motor controller is capable of swiftly driving a motor at the initial stage and driving the motor with high efficiency and low power consumption after swiftly driving the motor at the initial stage by including a first capacitor connected in series with stator coils of the motor and a PTC thermistor (Positive Temperature Coefficient thermistor) connected in parallel with the first capacitor.

Abstract: The present invention discloses a stator of a motor including a circular stator core formed by stacking a plurality of sheets, a plurality of bobbins fixed to the inner circumferential surface of the stator core at predetermined intervals and rotatably connected to each other, and stator coils wound around the outer circumferential surfaces of the bobbins to be connected to each other, and a method for manufacturing the same. The stator of the motor can reduce an assembly time by omitting a process for wiring the stator coils, and also reduce a number of components and manufacturing expenses by omitting a wiring PCB.

Abstract: A blowing fan includes: a hub connected to a rotational shaft of a motor and receiving a driving force of the motor; and a plurality of blades connected at equal intervals in a circumferential direction of the hub and generating a blowing force, in which a connection between the blades and the hub has an area-reduced form in order to reduce a rigidity of the connection portion. The rigidity between a hub where a rotational shaft is fixed and a blade is weakened to lower a torsional resonant frequency of the rotational shaft. Thus, a noise of a refrigerator is considerably reduced.

Abstract: A driving circuit for improving starting of a hybrid induction motor and its method includes a capacitor for operation electrically connected between a main coil and a auxiliary-coil, and a starting and current cutting-off means electrically connected with the capacitor for operation, applying a high starting current to a motor in starting, and cutting off the starting current when the motor is operated at a synchronous speed after the starting, so that a satisfactory starting characteristic can be obtained by increasing output under a low voltage state in starting, and effective operation can be performed by decreasing output under a normal operation state after the starting is completed.

Abstract: An electric motor includes: a stator having a plurality of first coils with a rotor receiving part formed inside thereof and generating a rotating magnetic field and a plurality of second coils making a pair with the first coils and generating an induction magnetic field induced by the magnetic field of the first coils; a first rotor formed as a hollow permanent magnet, installed in the rotor receiving part and rotated by the magnetic field formed in the first coils and the second coils of the stator; and a second rotor having a rotational shaft fixedly installed at a center of the second rotor, and being installed inside the first rotor so as to be rotated by rotation of the first rotor.

Abstract: Disclosed is a stator of an induction motor, the induction motor comprising: a stator provided with a main winding coil and an auxiliary winding coil at a plurality of slots formed at a body of the stator; an induction rotor rotatably inserted into the stator; and a magnet rotor rotatably inserted between the stator and the induction rotor. Coil spans, intervals between the slots of the stator, are different each other thus to have an increased counter electromotive force induced to the main winding coil at the time of driving, thereby enhancing efficiency of the motor. Also, end lengths of the main winding coil and the auxiliary winding coil become short and the structure becomes simple, thereby reducing a consumption amount of the coil and facilitating a coil winding work.

Abstract: A line start reluctance synchronous motor comprises: a single phase stator arranged at an inner circumferential surface of a motor body and on which a main coil and a sub coil are wound; a magnet unit free-rotatably arranged along an inner circumferential surface of the stator in order to maintain an air gap with the stator; and a cage rotor provided with a rotation shaft at a center portion thereof to be rotatable along an inner circumferential surface of the magnet unit, provided with a cage bar at a peripheral portion thereof, and provided with magnetic barriers having the same pole numbers as the magnet unit.

Abstract: Disclosed is a stator of an induction motor, the induction motor comprising: a stator provided with a main winding coil and an auxiliary winding coil at a plurality of slots formed at a body of the stator; an induction rotor rotatably inserted into the stator; and a magnet rotor rotatably inserted between the stator and the induction rotor. Coil spans, intervals between the slots of the stator, are different each other thus to have an increased counter electromotive force induced to the main winding coil at the time of driving, thereby enhancing efficiency of the motor. Also, end lengths of the main winding coil and the auxiliary winding coil become short and the structure becomes simple, thereby reducing a consumption amount of the coil and facilitating a coil winding work.

Abstract: Disclosed is a magnetizing apparatus of an induction motor comprising: an outer magnetizer arranged at an outer circumferential surface of a magnetic substance that forms a magnet of an induction motor, for magnetizing the outer circumferential surface of the magnetic substance; an inner magnetizer arranged at an inner circumferential surface of the magnetic substance, for magnetizing the inner circumferential surface of the magnetic substance; and a magnetizing power supplier for supplying a magnetizing power source to the outer magnetizer and the inner magnetizer. The outer and inner circumferential surfaces of the magnetic substance are simultaneously magnetized, so that a magnetized area of the magnetic substance is increased, a magnetic force of the magnet is increased, and a motor efficiency is enhanced.

Abstract: A driving circuit for improving starting of a hybrid induction motor and its method includes a capacitor for operation electrically connected between a main coil and a auxiliary-coil, and a starting and current cutting-off means electrically connected with the capacitor for operation, applying a high starting current to a motor in starting, and cutting off the starting current when the motor is operated at a synchronous speed after the starting, so that a satisfactory starting characteristic can be obtained by increasing output under a low voltage state in starting, and effective operation can be performed by decreasing output under a normal operation state after the starting is completed.

Abstract: A skeleton type brushless motor comprises: a rotor in which a rotational shaft is pressed and fixed; a stator including a first stator core and a second stator core in which rotor receiving parts for receiving the rotor are formed, a coil winding unit coupled to the stator cores, and a coil wound on the coil winding unit; and the first and second stator cores are separated and faces each other centering around the rotational shaft of the rotor, whereby a leakage flux is reduced and maneuverability and efficiency are increased.

Abstract: A single phase induction motor comprises: a stator installed at an inner circumferential surface of a motor body, the stator on which a plurality of coils are wound; a rotor rotatably installed at a center portion of the stator and provided with a rotation shaft at a center thereof; and a magnet unit freely and rotatably installed between the stator and the rotor with an air gap.

Abstract: An electric motor, more particularly, a rotor structure of an electric motor comprises: a stator including a plurality of teeth and coil wound on the teeth to form rotary magnetic flux by applied electric source; a rotary shaft; and a rotor rotatably installed in the stator, the rotor including a shaft insertion hole so that the rotary shaft can be inserted therethrough and fixed, wherein, the rotor includes a plurality of permanent magnet insertion slots of ‘V’ or ‘U’ shape formed in radial direction as centering around the shaft insertion hole, and permanent magnets are inserted and fixed into the permanent magnet insertion slots respectively, and a plurality of air gap expanding portions, on which air gaps from the teeth of the stator are expanded, are formed on an outer circumferential surface of the rotor.

Abstract: An electric motor, more particularly, a rotor structure of an electric motor comprises: a stator including a plurality of teeth and coil wound on the teeth to form rotary magnetic flux by applied electric source; a rotary shaft; and a rotor rotatably installed in the stator, the rotor including a shaft insertion hole so that the rotary shaft can be inserted therethrough and fixed, wherein, the rotor includes a plurality of permanent magnet insertion slots of ‘V’ or ‘U’ shape formed in radial direction as centering around the shaft insertion hole, and permanent magnets are inserted and fixed into the permanent magnet insertion slots respectively, and a plurality of air gap expanding portions, on which air gaps from the teeth of the stator are expanded, are formed on an outer circumferential surface of the rotor.

Abstract: An electric motor includes: a stator having a plurality of first coils with a rotor receiving part formed inside thereof and generating a rotating magnetic field and a plurality of second coils making a pair with the first coils and generating an induction magnetic field induced by the magnetic field of the first coils; a first rotor formed as a hollow permanent magnet, installed in the rotor receiving part and rotated by the magnetic field formed in the first coils and the second coils of the stator; and a second rotor having a rotational shaft fixedly installed at a center of the second rotor, and being installed inside the first rotor so as to be rotated by rotation of the first rotor.