35results about How to "Improve sinusoidality" patented technology

The invention belongs to the three-dimensional sensing technology and discloses a method for generating a light field with a sine structure by means of space-time binary encoding. According to the method, a standard sine fringe pattern 1 generated by a computer is equally divided into 2<n> (n>=2) sections according to gray-level distribution, then time and space encoding is conducted on each section by means of two-dimensional error diffusion to obtain 2<n> (n>=2) binary fringe patterns (2, 3, 4, ..., 5), and then linear superposition is conducted on the binary fringe patterns after the binary fringe patterns are projected and acquired through an imaging system, so that a high-quality sine fringe 6 is obtained. The projected binary fringe patterns are not affected by the non-linear response of a digital projector, the high-speed binary pattern switching function of the digital projector is fully utilized, and the speed and precision of three-dimensional surface measurement are improved.

The invention relates to the field of permanent magnet motors, and discloses a built-in permanent magnet motor. The built-in permanent magnet motor comprises a case, a regular polygonal stator iron core, an asymmetric hybrid rotor iron core, permanent magnets, a shaft, windings and insulating frames. The regular polygonal stator iron core is defined by a plurality of T-shaped tooth connection yokes. The contact part of the regular polygonal stator iron core and the case forms a contact area, and a gap between the regular polygonal stator iron core and the case forms a filling area. The asymmetric hybrid rotor iron core comprises a shaft sleeve, a shaft hole, a fan area, connecting bridges and supporting protrusions and contains full-connecting-bridge-type laminations and a half-connecting-bridge-type lamination. The full-connecting-bridge-type laminations are located at the two ends of the asymmetric hybrid rotor iron core, and the half-connecting-bridge-type lamination is clamped by the full-connecting-bridge-type laminations in a wrapped mode in the axial direction. Tooth parts of all the T-shaped tooth connection yokes are wrapped with the insulating frames. The windings are wound around the insulating frames. According to the built-in permanent magnet motor, the production technology of the motor can be simplified, and the structural strength of the motor can also be improved.

The invention discloses an ultrahigh-power servomotor, which belongs to the field of servomotors. The ultrahigh-power servomotor comprises a stator and a rotor; the rotor is located in the stator; the central axis of the stator is superposed with the central axis of the rotor; a double-layer winding is wound in stator slots on the stator, so that the electromotive force of the motor is close to the sine-shaped winding; the distribution pattern of the winding on the stator is short-distance distribution; the rotor comprises a rotor shaft and steel magnets; the steel magnets are fixed on the periphery of the rotor shaft; the rotor shaft at which the steel magnets are fixed is of a non-cylindrical structure; the steel magnets are non-uniform-thickness steel magnets; the cross section of each steel magnet is shaped like a reaphook, and the magnetization method is parallel magnetization. The sinusoidality of the electromotive force of the ultrahigh-power servomotor disclosed by the invention is high, and the ultrahigh-power servomotor can realize low inertia, high rotational speed, short-time peak overload and other performance indexes under the condition of high specific power.

The invention discloses a high-power-density hub motor structure. The high-power-density hub motor structure comprises an outer rotor, a stator, an inner rotor and a hub which are coaxially arranged, the outer rotor and the inner rotor are connected through a fixing support, the outer rotor comprises an outer rotor iron core and a plurality of V-shaped magnetic steel grooves evenly formed in the outer rotor iron core in the circumferential direction, and a linear magnetic steel groove is formed between every two adjacent V-shaped magnetic steel grooves; a permanent magnet is embedded in each magnetic steel groove, the periphery of the outer rotor iron core is fixed with a hub; inner stator teeth and outer stator teeth are arranged on the stator, and an inner stator slot and an outer stator slot are respectively arranged between the adjacent inner stator teeth and between the adjacent outer stator teeth; the inner stator slot and the outer stator slot are respectively provided with two set of concentrated windings, the two sets of concentrated windings are connected in series; and the end part of each inner stator tooth and the end part of each outer stator tooth are each provided with at least one small slot, and therefore, a plurality of inner modulation teeth and outer modulation teeth can be formed. According to the high-power-density hub motor structure of the invention, the output torque and the power density of the motor can be improved under the condition that the stack length and the outer diameter of the hub are not changed.

The present invention provides a permanent magnet/reluctance dual-rotor low-speed and high-torque synchronous motor and a control system thereof. The synchronous motor is mainly formed by an outer rotor (1), an inner rotor (2) and a stator (3). The stator (3) is arranged between the outer rotor (1) and the inner rotor (2). The method estimates the position of a reluctance rotor to obtain the position of the whole rotor to achieve sensorless control. The provided sensorless vector control method does not need coordinate transformation, is simple in structure and can overcome the problems of thecomplexity of the vector control and the high dependence on the motor parameters.

The invention discloses a circuit control method and device. The method includes the steps that the duty ratio of a boost power factor correction circuit in an intermittent mode is calculated with average current equivalence of the boost power factor correction circuit in the intermittent mode in a switching period as ideal input current; the duty ratio serves as a first feed-forward wave; when the circuit is in the intermittent mode and an actual load is not larger than a set load threshold, the first feed-forward wave with the amplitude at the voltage zero-crossing position much smaller than that of a second feed-forward wave is selected as a feed-forward wave of the circuit, feed-forward control is conducted on the circuit according to the selected feed-forward wave, wherein the second feed-forward wave is 1-Uin/UBus, so when the boost power factor correction circuit is in the intermittent mode and the load is small, the feed-forward wave of the circuit is much smaller than 1 at the voltage zero-crossing position, that is, the duty ratio is not full, the voltage of a bus cannot be increased, and the effects of improving the sinusoidal property of current, reducing the input current harmonic content, improving PF and the like can be achieved.

The invention provides a hybrid permanent magnet rotor for an electric vehicle, belonging to the technical field of electric vehicle motors. The rotor is an inner rotor structure, comprising a first permanent magnet, a second permanent magnet, a third permanent magnet, a non-magnetic conductive fixed core, a rotor iron core and a tightening ring, and the rotor iron core is fixed on the periphery of the non-magnetic conductive fixed core; The first permanent magnet, the second permanent magnet and the third permanent magnet are the same in number and even in number, and are combined into a shape. The outer side of the rotor is provided with a tightening ring to prevent deformation of the rotor. Compared with the existing permanent magnet synchronous motor rotor, it saves part of the scarcerare earth permanent magnet, has higher magnetic field strength, higher mechanical strength, effective use of reluctance torque, and higher output power.

The invention relates to a stator and a motor using the same. The stator comprises a stator magnetic core and a stator winding wound on the stator magnetic core, and the stator magnetic core comprises: an annular stator magnet yoke; stator teeth which extend from the stator magnet yoke in the radial direction, wherein the stator teeth are evenly distributed in the circumferential direction of the stator magnet yoke at intervals, and wire grooves used for containing wires of the stator winding are formed between the adjacent stator teeth. The plurality of stator teeth at least comprise a first type of stator teeth with a first length and a second type of stator teeth with a second length, and the second length is greater than the first length; and the first type of stator teeth and the second type of stator teeth are alternately arranged along the circumferential direction according to a preset rule. According to the embodiment of the invention, the sinusoidal property of the magnetomotive force generated by the winding can be improved, the harmonic electromagnetic force is weakened, and the electromagnetic performance of the motor is improved.

The invention discloses a novel stator structure of an axial magnetic flux motor, which comprises more than three coil monomers which are annularly distributed in a stator and have the same specification, every N adjacent coil monomers form a coil unit, three coil units are arranged in the stator, the included angle between any two adjacent coil units is theta, and theta is greater than or equal to 1. The value range of theta is 2-35 degrees, and the coil monomers in each coil unit are annularly and uniformly distributed in an array at the angle of 360-3*theta. The invention provides a non-uniformly distributed stator structure of an axial magnetic flux motor, which is simultaneously suitable for an axial magnetic flux motor with an iron core and an axial magnetic flux motor without an iron core, can effectively reduce higher harmonics of counter electromotive force of the motor, and improves the sinusoidal property of the output voltage waveform of the motor.

The invention relates to a three-dimensional imaging method based on an error diffusion dithering algorithm. The method includes the following steps: acquiring a threshold value obtained based on an average gray value and an error compensation parameter in a matrix around a pixel in an error diffusion dithering algorithm; adding an original gray value of a to-be-detected pixel point to a quantization error introduced in the error diffusion process, calculating a temporary gray value of each pixel in a full image, comparing the temporary gray values with the threshold, indicating the pixel output to be 255 under the condition of being larger than the threshold by the temporary gray values, and otherwise, indicating the pixel output to be0; and carrying out defocusing on the output pixel toobtain three-dimensional imaging. On the basis of the threshold optimization method, the three-dimensional structured light imaging is optimized, so that the sinusoidal nature of the defocusing grating is improved effectively and the imaging errors are reduced.

The invention discloses a stator and rotor structure of a surface-mounted permanent magnet motor, which comprises a stator, a rotor, stator water holes, permanent magnets and permanent magnet auxiliary grooves. In order to output high torque and stably operate the motor, the structure adopts an inner rotor and outer stator mechanism, the inner rotor adopts a magnetic pole surface-mounted type, and the magnetic pole adopts two non-uniform permanent magnets, the inner side arc and the outer side arc are located on the same circle with the proportion of 6:5, auxiliary grooves are formed in magnetic poles, excitation windings are placed in inner stator winding grooves, and two round holes are formed in stator teeth to be connected with water pipes to facilitate heat dissipation of the motor. According to the invention, the asymmetric structure of the magnetic poles is used to reduce eddy current loss and optimize the air-gap flux density waveform, reduce magnetic leakage and enhance the sinusoidal property of the air-gap magnetic field; the permanent magnets are used for forming auxiliary slots to reduce cogging torque pulsation; and the purposes of reducing the waveform irregularity and controlling the temperature rise are achieved by using the water holes formed in the stator, so that the motor can operate more safely and stably.

The invention discloses a rotor magnetic-field sine permanent-magnet reluctance synchronous motor rotor structure. The rotor magnetic-field sine permanent-magnet reluctance synchronous motor rotor structure comprises a central rotation shaft and a rotor core, wherein the rotor core sleeves the central rotation shaft, P through groove groups are uniformly formed in positions, encircling the centralrotation shaft, of the rotor core and are same in shape and size, P is rotor magnetic poles, each through groove group comprises a plurality of through grooves, permanent magnets are arranged in thethrough grooves, the polarities of the permanent magnets in the same through groove group are same, the polarities of permanent magnets in two adjacent through groove groups are different, and the lengths of the permanent magnets in the same through groove group are different. By arranging the lengths of the permanent magnets in the same through groove group to be different, the sine performance of a rotor magnetic field can be improved, and the ripple torque is reduced. By the rotor magnetic-field sine permanent-magnet reluctance synchronous motor rotor structure, the harmonic content of an air gap magnetic field can be reduced, the eddy-current loss is reduced, and the running efficiency of the motor is improved.

The invention relates to a radial and axial dual-modular magnetic flux switching motor. The radial and axial dual-modular magnetic flux switching motor comprises a stator and a rotor; the stator comprises an armature winding and at least one stator module arranged in the axial direction, each stator module comprises two stator units, and magnetic isolation rings are embedded between the two stator units of each stator module and between the two adjacent stator units of the two adjacent stator modules; each stator unit comprises a permanent magnet and a plurality of stator iron cores which are arranged in a circumferential manner, and the permanent magnet is embedded between two adjacent stator iron cores; the same armature coil of the armature winding is wound on the magnetic conductive bridge arms of the stator cores at the same positions of all the stator units along the axial direction of the motor; and the rotor comprises rotor modules with the same number as the stator modules, each rotor module comprises two rotor units, and the difference between the central angles of the installation positions of the two rotor units of each rotor module is 180 DEG. The harmonic waveform of the permanent magnet flux linkage of the motor is closer to sine waves, pulsation of output torque of the motor is reduced, and vibration and noise are reduced.