5results about How to "Increased reluctance" patented technology

The utility model discloses a PEEP valve for a breathing machine and an anaesthesia machine. The PEEP valve comprises a thrust driving assembly and an air path assembly. The thrust driving assembly comprises an upper cover, a second printed circuit board, a coil support, a coil, an inner magnet yoke, an outer magnet yoke, a permanent magnet, a first printed circuit board, a flexible circuit board and a push rod. The inner magnet yoke and the permanent magnet are located in the outer magnet yoke and are coaxial; the coil is wound on the outer ring of the coil bracket; the push rod is fixed in the center of the coil bracket; the coil support is located on the inner magnet yoke, the push rod penetrates through the permanent magnet and a center hole of the inner magnet yoke, the two ends of the flexible circuit board are connected with the first printed circuit board and the second printed circuit board respectively, the first printed circuit board is fixed to the coil support, and the second printed circuit board is fixedly connected to the upper cover. The top of the push rod penetrates through the center through hole of the upper cover and is in clearance fit with the center through hole. The permanent magnet synchronous motor is high in efficiency, long in service life, strong in manufacturability and high in thrust linearity.

The invention provides a rotor structure and a motor. The rotor structure comprises a rotor body and a plurality of magnetic bodies. The rotor body comprises a rotor yoke part and a plurality of rotor salient poles, the rotor salient poles are arranged on the outer circumferential surface of the rotor yoke part, and the plurality of rotor salient poles are arranged at intervals along the circumferential direction of the rotor yoke part; a mounting groove is formed between every two adjacent rotor salient poles; the magnetic bodies are arranged in the mounting grooves, and the plurality of magnetic bodies and the plurality of rotor salient poles are alternately arranged; grooves are formed in the side faces, making contact with the magnetic bodies, of the rotor salient poles. The motor comprises the rotor structure. The grooves are formed in the side faces, making contact with the magnetic bodies, of the salient poles of the rotor, magnetic leakage can be reduced, the sine degree of air gap flux density can be improved, the use amount of the magnetic bodies is reduced, meanwhile, counter electromotive force is effectively improved, the harmonic content of the counter electromotive force is reduced, and the operation performance of the motor can be improved, such as torque pulsation and noise reduction.

The invention relates to an adjustable damping valve device, comprising an actuator with an excitation coil and a valve armature, wherein the valve armature is movably supported in a sleeve-like yoke body, wherein the yoke body has a pole disc on the bottom side, which is arranged position-fixed relative to the valve housing, wherein an emergency operation valve body is switched between an emergency operation state and a normal operation state depending on the power supply of the excitation coil, wherein the emergency operation valve body is switched by a force caused by the magnetic flux of the excitation coil through the yoke body and the pole disc, wherein a magnetic resistance is arranged between the pole disc and the valve housing, wherein the magnetic resistance is generated by an additional magnetic field outside the magnetic field of the excitation coil.

The invention relates to the technical field of permanent magnet brushless direct current motors, in particular to a tangential built-in brushless direct current motor rotor structure which comprises a rotating shaft sleeved with a first punching sheet and a second punching sheet. The first punching sheet comprises an inner punching sheet unit used for sleeving the rotating shaft and a plurality of outer punching sheet units arranged along the circumferential direction of the inner punching sheet unit at intervals, and gaps between the outer punching sheet units form permanent magnet grooves used for installing permanent magnets; the second punching sheet structure is the same as the first punching sheet structure, and the difference is that the outer punching sheet unit of the second punching sheet and the outer punching sheet unit of the first punching sheet are in a mirror image structure; through the first punching sheets and the second punching sheets of the outer punching sheet units which are arranged in a mirror image manner, a novel segmented rotor optimization structure is designed, the amplitudes of the torque at the wave crests and the wave troughs in the circumferential direction are reduced, the magnetic field waveform of the motor is optimized, and the effect of weakening the cogging torque is achieved; meanwhile, through an air magnetic isolation structure, magnetic flux leakage path magnetic resistance is increased, and the magnetic flux leakage coefficient is reduced.

The present invention provides a motor rotor and a permanent magnet motor. The motor rotor comprises a rotor core (1), the rotor core (1) is provided with a plurality of permanent magnet slots (2) along the circumferential direction, permanent magnets (3) are provided in the permanent magnet slots (2), magnetic isolation slots (4) are provided inside the permanent magnet slots (2), the width of the magnetic isolation slots (4) decreases along the radial direction close to the central axis of the rotor core (1), a first magnetic isolation hole in the shape of a strip is provided between two adjacent magnetic isolation slots (4), a magnetic isolation bridge is formed between the first magnetic isolation hole and the magnetic isolation slots (4), and a preset angle is formed between the magnetic isolation bridge and the center line of the magnetic pole. According to the motor rotor of the present invention, the magnetic isolation effect can be effectively improved, the magnetic leakage inside the motor rotor can be reduced, the magnetization saturation of the motor rotor can be improved, and the motor performance can be improved.