4results about How to "Reduce magnetic saturation" patented technology

This invention relates to a current measuring device and a current measuring method, which reduces the influence of magnetic saturation of a magnetic shield and accurately measures the current flowing in a conductor. The current measuring device includes: a magnetic shield having a cutout for capturing the magnetic field generated by the current flowing in the conductor into its internal space; a sensor disposed within the internal space of the magnetic shield and outputting a voltage corresponding to the magnetic field at its location; and a circuit unit that detects the current flowing in the conductor based on the voltage output from the sensor. In this current measuring device, the magnetic shield has a first correction unit, and / or, the magnetic shield or the circuit unit has a second correction unit. The first correction unit corrects for the influence of magnetic flux density saturation of the magnetic shield by the magnetic field measured by the sensor, and the second correction unit corrects the voltage output from the sensor in a manner that reduces the influence of magnetic flux density saturation of the magnetic shield.

The present application relates to a kind of electromagnetic underwater acoustic transducers, including shell, it is arranged in liquid-filled pipeline;Displacement amplifier module is arranged in shell, displacement amplifier module includes drive panel, oil cylinder and radiation panel, radiation panel is retractably arranged below oil cylinder, radiation panel side and liquid in liquid-filled pipeline contact, drive panel is retractably arranged above oil cylinder;Water pressure balancer module is arranged above drive panel;Electromagnetic actuator module is arranged in shell and is outside water pressure balancer module.The present application passes through water pressure balancer module and transmits the hydraulic pressure outside shell to drive panel, so that the drive panel and radiation panel on both sides of oil cylinder keep hydraulic balance, in through electromagnetic actuator module drive keep hydraulic balance after the drive panel and radiation panel movement, make radiation panel emit amplitude opposite, phase same acoustic wave to offset noise, so that transducer can eliminate sound in the pipeline of greater pressure.

The utility model discloses a rotor assembly and a motor, and relates to the technical field of motors, the rotor assembly comprises a rotor yoke, a plurality of radial magnetic shoes and a plurality of circumferential magnetic shoes, and the rotor yoke is configured to be annular and rotates around a rotation axis; the plurality of radial magnetic shoes are connected to the inner side of the rotor yoke and configured to be magnetized in the radial direction of the rotating axis, and the plurality of radial magnetic shoes are arranged at intervals in the circumferential direction of the rotating axis; the plurality of circumferential magnetic shoes are connected to the inner side of the rotor yoke and configured to be magnetized in the circumferential direction of the rotating axis, and the plurality of circumferential magnetic shoes are located between every two adjacent radial magnetic shoes respectively; one side surface, facing the rotating axis, of each radial magnetic shoe comprises a first arc surface, and a first surface and a second surface which are connected to the two sides of the first arc surface in the circumferential direction, the distance between the first surface and the rotating axis is gradually increased in the direction away from the first arc surface, and the distance between the second surface and the rotating axis is gradually increased in the direction away from the first arc surface. The rotor assembly of the utility model can enhance the electromagnetic performance and improve the mute effect.

The application relates to an electric device, comprising a valve assembly and a stator assembly, the valve assembly comprising a magnetic rotor, the magnetic rotor comprising first magnetic poles and second magnetic poles, the first magnetic poles and the second magnetic poles being alternately arranged along a circumferential direction of the magnetic rotor, the stator assembly comprising a winding and a claw pole shell, the winding being located in the claw pole shell, the claw pole shell comprising first tooth poles and second tooth poles, the first tooth poles and the second tooth poles being alternately arranged between an outer periphery of the magnetic rotor and an inner periphery of the winding, the maximum value of an arc of the first tooth pole being defined as alpha, the number of the first magnetic poles being defined as P, and 0.43 <= alpha*P / PI <= 0.57, so that the average torque of the electric device is relatively larger under the same condition, the magnetic leakage problem and the magnetic saturation problem of the tooth pole are reduced, and the driving performance of the electric device is improved.