32results about How to "Wide tuning range" patented technology

The present invention provides an unsymmetrical, crossly mixed excitation synchronous motor pertaining to the technology field of electric motor for variable-speed driving. The technology problem to be solved is: a new type mixed excitation synchronous motor which has been improved to have a higher efficiency, a bigger low-speed starting torque and a wider timing range. The motor in the present invention adopts a structure with an internal stator and an external stator. A stator back yoke (15) for magnetic guiding in the axes direction of a stator is provided out of a stator, adopting a unique tile shaped structure which is easy to process. The external stator is identical to the traditional stator of the electric motor, and the ring shaped field copper (7) is fixed on the end cover (14) of the electric motor to form an internal stator through a field yoke bracket (12). The thickness of the Claw-Pole (5) of the N pole is identical to that of the Claw-Pole (11) of the S pole, and the permanent-magnet pole (1) and the magnet core pole (2) of the N pole are adhered on the surface of the Claw-Pole of the N pole, and are separated by an air gap (9) for separating the magnet; the permanent-magnet pole (8) and the magnet core pole (10) of the S pole are adhered on the surface of the Claw-Pole of the S pole, and are separated by an air gap (9) for separating the magnet.

The invention discloses a double-end hybrid excitation stator-partition-type flux switching motor. The inner surface of a stator yoke of an external stator is provided with armature teeth and excitation teeth alternately at intervals in circumference direction; each armature tooth is wound by an armature winding, and each excitation tooth is wound by an external DC excitation winding; a stator core of an internal stator is uniformly provided with inner stator slots, the number of which is same with that of the armature teeth, in the circumference direction; the inner side of each inner stator slot is embedded by a non-rare-earth ferrite permanent magnet; the outer side of each inner stator slot is placed by an internal DC excitation winding; a stator core between every two inner stator slots is embedded by a rare-earth neodymium-iron-boron permanent magnet; the external diameter of each rare-earth neodymium-iron-boron permanent magnet is equal to the internal diameter of the non-rare-earth ferrite permanent magnet; and the internal diameter of the rare-earth neodymium-iron-boron permanent magnet is equal to the internal diameter of each inner stator slot. The flux switching motor adopts internal and external stator double-end excitation and realizes flexible control of an air-gap magnetic field, has a broader magnetically-adjusting range and ensures higher torque density and power density of the motor.

The invention discloses a double-end hybrid excitation stator-partition-type flux switching motor. The inner surface of a stator yoke of an external stator is provided with armature teeth and excitation teeth alternately at intervals in circumference direction; each armature tooth is wound by an armature winding, and each excitation tooth is wound by an external DC excitation winding; a stator core of an internal stator is uniformly provided with inner stator slots, the number of which is same with that of the armature teeth, in the circumference direction; the inner side of each inner stator slot is embedded by a non-rare-earth ferrite permanent magnet; the outer side of each inner stator slot is placed by an internal DC excitation winding; a stator core between every two inner stator slots is embedded by a rare-earth neodymium-iron-boron permanent magnet; the external diameter of each rare-earth neodymium-iron-boron permanent magnet is equal to the internal diameter of the non-rare-earth ferrite permanent magnet; and the internal diameter of the rare-earth neodymium-iron-boron permanent magnet is equal to the internal diameter of each inner stator slot. The flux switching motor adopts internal and external stator double-end excitation and realizes flexible control of an air-gap magnetic field, has a broader magnetically-adjusting range and ensures higher torque density and power density of the motor.

The invention discloses a stator partition type hybrid excitation motor with a built-in magnetic adjustment ring structure, which includes an outer stator, a rotor and an inner stator, the outer stator (1) and the rotor (2) are separated by an air gap, and the inner stator ( 3) and the rotor (2) are separated by an air gap; the outer stator (1) is evenly provided with 12 outer stator teeth along the circumferential direction, and the armature winding (4) is wound on the outer stator teeth; the inner stator (3) There are 12 inner stator teeth evenly arranged along the circumferential direction, and a centralized excitation winding (5) is wound on the inner stator teeth, and 12 permanent magnets (6) are evenly inserted into the inner stator yoke along the circumferential direction, and each permanent magnet is cut For magnetization, the inside of the inner stator (3) is evenly provided with 6 alternating magnetic bridges (7) connected to the magnetic adjustment ring (8); the intermediate rotor is composed of 7 magnetic adjustment blocks evenly placed. The invention realizes that the output torque can be adjusted up and down according to the requirement of the application occasion, and has superior flexibility.

A preparation method of a photonic crystal high-power laser, by adding an isolation layer between the quantum well light-emitting layer and the lower Bragg reflection layer, and forming an air column into a photonic crystal by laser etching after the epitaxial wafer is grown, and the quantum well light-emitting layer works The generated photons can only pass through the surface of the photonic crystal through the resonant tunneling effect, which can effectively improve the wider tuning range and narrower line width. The lower Bragg emission layer and the upper Bragg reflection layer are integrated in one laser to form two independent gratings. To achieve a wider wavelength tuning range, narrower spectral linewidth, and higher power, the stimulated radiation light has the same frequency, phase, polarization and propagation direction as the external stimulated radiation light. Through stimulated emission, the number of homogeneous photons can be amplified to obtain coherent light with extremely high photon degeneracy. Since the power of lasers is generally low at present, high power can realize wider applications such as long-distance and multi-channel lasers.

The invention provides a low-frequency magnetic metamaterial unit structure body and a combination device thereof. By means of a process of winding multiple turns of metal wires and combining with lumped-parameter electronic elements, the magnetic metamaterial unit structure body is formed in a sub-wavelength wavelength size so that the magnetic metamaterial unit structure body can be subjected toresonance by loading the resonance frequency of the lumped-parameter electronic elements under cooperation with the metal wires with equivalent magnetic conductivity. The low-frequency magnetic metamaterial unit structure body and the combination device thereof solve the technical problem that the supportable power level of existing metamaterials is not high during application and achieve the purpose of applying the metamaterials in wireless power transmission with low frequency and high power more than 100 watts.

The invention relates to an asymmetric structure high-power laser with a Bragg reflector and a preparation method thereof, belonging to the field of lasers. 1‑x In x P transition layer, Al 1‑ x In x P lower confinement layer, (Al 1‑x Ga x ) y In 1‑y P lower waveguide layer, Ga 1‑ x In x P quantum well light-emitting region, (Al 1‑x Ga x ) y In 1‑y P upper waveguide layer, Al 1‑x Ga x As Bragg reflector, Al 1‑x Ga x As upper confinement layer and GaAs capping layer. The invention can obtain a narrower spectral line width, effectively reduce internal loss, reduce heat generation, improve electro-optical conversion efficiency, and improve the stability and life of the device, thereby realizing long-distance, multiple Road and other wider applications.

The present invention provides an unsymmetrical, crossly mixed excitation synchronous motor pertaining to the technology field of electric motor for variable-speed driving. The technology problem to be solved is: a new type mixed excitation synchronous motor which has been improved to have a higher efficiency, a bigger low-speed starting torque and a wider timing range. The motor in the present invention adopts a structure with an internal stator and an external stator. A stator back yoke (15) for magnetic guiding in the axes direction of a stator is provided out of a stator, adopting a unique tile shaped structure which is easy to process. The external stator is identical to the traditional stator of the electric motor, and the ring shaped field copper (7) is fixed on the end cover (14) of the electric motor to form an internal stator through a field yoke bracket (12). The thickness of the Claw-Pole (5) of the N pole is identical to that of the Claw-Pole (11) of the S pole, and the permanent-magnet pole (1) and the magnet core pole (2) of the N pole are adhered on the surface of the Claw-Pole of the N pole, and are separated by an air gap (9) for separating the magnet; the permanent-magnet pole (8) and the magnet core pole (10) of the S pole are adhered on the surface of the Claw-Pole of the S pole, and are separated by an air gap (9) for separating the magnet.

The invention discloses a three-section type variable magnetic circuit series-parallel connection adjustable magnetic flux motor, belongs to the field of permanent magnet motors, and aims at solving the problems of an existing adjustable magnetic flux motor. The motor comprises a stator core, a stator winding, a rotor core and a rotating shaft. The rotor iron core is fixed on the rotating shaft and located in the stator iron core, and the armature winding is arranged on the stator iron core; the series-parallel connection adjustable magnetic pole comprises a first high-coercive-force permanent magnet, a first low-coercive-force permanent magnet, a second low-coercive-force permanent magnet and a second high-coercive-force permanent magnet; a V-shaped permanent magnet groove and a linear permanent magnet groove are arranged below each pole of a rotor iron core, symmetry axes of the two permanent magnet grooves coincide, a pair of first high-coercive-force permanent magnets and a pair of first low-coercive-force permanent magnets which are connected in series are symmetrically installed in the V-shaped permanent magnet grooves close to the air gap side, and a pair of second low-coercive-force permanent magnets are symmetrically installed in the V-shaped permanent magnet grooves away from the air gap side. Second high-coercivity permanent magnets are installed in the linear permanent magnet grooves.

The invention discloses a double-stator hybrid excitation motor with a T-shaped iron core inner stator. The middle rotor is coaxially installed between the outer stator and the inner stator. The inner stator yoke of the inner stator has 12 T-shaped teeth evenly arranged along the circumferential direction. There is an excitation winding on the upper cover. The top of the T-shaped teeth is close to the middle rotor, and an inner stator slot is formed between two adjacent T-shaped teeth. An arc-shaped permanent magnet is fixedly embedded between the tooth tops of each two T-shaped teeth. The permanent magnets are magnetized tangentially and the two adjacent permanent magnets are magnetized in opposite directions. The inner and outer diameters of the permanent magnets are respectively the same as the T-shaped teeth. The inner and outer diameters of the tooth tops of the shaped teeth are equal; the excitation winding is wound on the vertical part of the T-shaped teeth of the inner stator, thereby forming an electric excitation magnetic field in parallel with the permanent magnetic field to avoid the demagnetization effect of the electric excitation magnetic field on the permanent magnet. When DC currents in different directions are passed through the excitation winding, the electric excitation magnetic field interacts with the permanent magnetic field to achieve magnetization increase or weakening adjustment.