316results about "Shielding from electromagnetic fields" patented technology

A DC motor having a motor housing and a motor controller housed within the motor housing. In a preferred embodiment the heat producing components of the motor controller are in thermal communication with the housing such that the majority of the heat produced by such components will be readily conducted to the environment in which the motor is operating. When incorporated into a trolling motor, the motor housing of the present invention will be submerged so that controller produced heat will be dissipated into the water in which the trolling motor is operated.

The invention discloses a brushless excitation mechanism based on wireless transmission of electric energy. The mechanism comprises a high frequency excitation source, an auxiliary excitation transmitting coil, an auxiliary excitation receiving coil, a rotating rectifier bridge, a soft magnetism optimization layer and a metal shielding layer, wherein the high frequency excitation source and the auxiliary excitation transmitting coil are arranged outside a motor, the auxiliary excitation receiving coil, the rotating rectifier bridge, the soft magnetism optimization layer and the metal shielding layer are arranged in the motor, an electromagnetic field of an excitation system is optimized and shielded through soft magnetism materials and metal materials, an excitation coil of a rotor of the alternating-current motor is supplied with power through the wireless transmission of the electric energy, mechanical connection between the rotor and external terminals is avoided, and brushless excitation of the motor is achieved.

An electric drive for a hand-held power tool. An electric supply line contains two or more stranded wires. An electric motor is electrically connected to the stranded wires. The stranded wires pass at least twice through the eye of a toroidal core. A partition divides the eye into several sectors. Precisely one of the stranded wires passes through each of the sectors. The stranded wires are arranged along the circumference of the eye so as to follow each other cyclically.

A device for preventing bearing damage from currents through a three-phase motor is provided, including a shield for winding and copper wire within each stator slot of a motor. The shield includes an electrically conductive layer which is insulated from the winding and from the laminated stator core of the three-phase motor. The conductive layer is grounded or conductively connected to the laminated stator core of the three-phase motor on only that side on which the three-phase current is fed to the winding of the motor.

The invention discloses a rotor of a permanent magnet synchronous motor (PMSM) and a motor, belongs to the technical field of motors and solves the problem that a conventional device has a lot of higher harmonic magnetic fields. The rotor of the PMSM has a plurality of magnetic steel grooves uniformly distributed in the circumferential direction of a rotor body, permanent magnets are inserted in the magnetic steel grooves, and the adjacent permanent magnets are opposite in polarity. A plurality of slits are arranged in the outer edge of the rotor body at positions corresponding to the magnetic steel grooves, the slits communicate with an air gap between a stator and the rotor, and the inner ends of the slits are on the same arc line; or, a plurality of slits are arranged in the outer edge of the rotor body at the positions corresponding to the magnet steel grooves, the slits communicate with the magnet steel grooves, and the outer ends of the slits are located on the same arc line. The rotor of the PMSM and the motor solve the problem that lots of harmonics exist in the air gap between the inner side wall of the stator and the outer side wall of the rotor, reduce the electromagnetic noise of the motor and ensure air-gap flux density and sinusoidal features.

A heat radiation structure of an electric apparatus provided herein is capable of readily releasing heat of electronic components to the outside and suppressing heat conduction to a rotational position sensor. A metal electromagnetic wave shielding member is fixed to a casing body of a casing. The electromagnetic wave shielding member includes a first portion that is connected to an opposed wall portion of the casing body to face a circuit substrate and a cylindrical second portion that is extending from a peripheral end of the first portion and along a peripheral wall portion of the casing body without being in contact with a housing. A heat conductive member having electrical insulating and heat conductivity properties as well as flexibility is disposed between the circuit substrate and the electromagnetic wave shielding member to closely contact both of the plurality of electronic components and the first portion of the electromagnetic wave shielding member.

The present invention leads to that the rotating position detector is not effected by the outer magnetic field, reduces the interference included in the output of the rotating position detector and prevents the false action of the rotating position detector. The rotating electric machine comprises the following components: a stator (2); a rotor (1) which has a rotation axis (4) and rotates axially with the stator (2); end caps (5) and (6) which support and fix the stator (2) and at the same time support the rotation axis (4) to facilitate the rotation; a rotating position detecting part (11) which is arranged on the rotation axis (4) at the side opposite to the load and detects the rotating position of the rotor (1); and a power part (18) which is arranged at the external circumferential side of the rotating position detecting part (11) and is provided with a switching element (9). In the rotating electric motor the rotating position detecting part (11) is arranged with a shielding component (12) which covers the external circumference to shield the magnetic field generated by the switching element (9).

A rotation angle detection device detects a rotation angle of a motor having a shaft passing through a heat-dissipation plate. The rotation angle detection device includes: a permanent magnet attached to a base end of the shaft; a board that is disposed above the heat-dissipation plate and on which a drive circuit of the motor and a control circuit of the drive circuit are mounted; a magnetic sensor that is provided on the board so as to face the permanent magnet; and a magnetic shielding member that has a tubular shape and is disposed between the heat-dissipation plate and the board to surround the permanent magnet in plan view.

An electric motor control system and methods of manufacture are provided. The system includes a power supply module including a printed circuit board (PCB) and a plurality of power processing components configured to convert an input voltage into an output voltage. The system also includes a motor management module including an encapsulated, heat-sharing package for housing a plurality of moisture-sensitive driver components configured to convert the output voltage from the power supply module and provide output voltages for application to windings of the electric motor.

The invention discloses a pump structure capable of enabling liquid molecules in a pump not to be leaked during operation through air jacking sealing and including an immersion pump and an application method of the pump structure. According to the structure, firstly, at least a rotor (2) is surrounded by a narrow metallic seal isolator (4) or a wide metallic seal isolator (5) in a stereoscopic manner, and a motor shaft seal (7), a charging connector mechanism (P) and a pressure display device connector (K) are arranged at the bottom of the narrow metallic seal isolator (4) or the wide metallic seal isolator (5); secondly, the periphery and the bottom for forming a liquid pump (9) are surrounded by a nondetachable metallic seal structure (10) in a stereoscopic manner; and all joint gaps of a full-sealed metallic seal isolation cavity of the pump structure are achieved through a welding process. Due to the fact that the underwater one-time working and idling duration cumulative time of the pump structure depends on the service life (about 30 years) of a motor and the infinite diving depth, and the extremely high cost performance is achieved, conditions are created for the pump structure to become an upgrade product of an immersible pump, and the structure is probably more suitable for a common water pump.

A rotary electric machine having a stator and a rotor, in addition to an electric control device and a connection device which comprises at least one coupling element for electrically connecting the control device to one or several electrical lines and a mass element provided to connect to an electric mass potential. In order to improve the machine with respect to electromagnetic interference, the stator is connected to the mass element by a contact bridge which has a first securing section and a second securing section in addition to a bridge element arranged between the securing sections and includes a single-piece spring steel sheet which is at least partially sinuous.

Provided is a motor controller of an electric reel, which does not give a trouble to outer equipment disposed close to the motor controller. In the motor of the electric reel, a varistor 66 for reducing noises is built. The varister 66 is built in the motor 12, and connected to a terminal of the motor in parallel. A PWM-driving circuit 45 for PWM-driving the motor 12 is connected to a choke coil for reducing noises. The choke coil 65 is disposed in the PWM-driving circuit 45 and connected in parallel to the motor 12. The choke coil 65 and the varister 66 are noise-reducing elements for reducing the noises of the motor 12.

The invention discloses a stator iron core, a stator and a motor. The stator iron core is arranged on the periphery of the rotor and includes a plurality of stator individuals arranged in the circumferential direction in a spaced manner. Each stator individual includes a yoke part formed through stacking a plurality of yoke part punching sheets together; two main tooth parts clamped at the two circumferential ends of the yoke part and formed by stacking a plurality of tooth part punching sheets perpendicular to the yoke part punching sheets together, wherein each main tooth part is therein provided with an extension part extending along the axial direction of the yoke part and having at least one end protruding from the main tooth part, and a closed-mouth groove penetrating through the main tooth part in the stacking direction of the tooth part punching sheets; a main tooth boot part formed through stacking a plurality of main tooth boot punching sheets perpendicular to the tooth part punching sheets together and provided with a clip tongue through arranging an open groove whose opening direction is parallel with the stacking direction of the tooth part punching sheets, wherein the clip tongue is clamped in the closed-mouth groove from one side of the closed-mouth groove; an end tooth boot part formed through stacking a plurality of end tooth boot punching sheets together and clamped on the extension part. According to the embodiment of the invention, the magnetic concentrating capability of the stator iron core is enhanced and the cost is reduced.

Aspects of the present invention provide an improved cable having a reduced cross section while continuing to provide high voltage (noisy) power signals alongside low voltage (noise-susceptible) data signals. The improved cable can be used for power delivery and communications between a motor and a drive in an industrial control system. The reduced cross section advantageously improves handling. By providing separate groups between a group delivering the power signals and a group providing the data signals, thereby enforcing a physical separation, and by twisting together individual conductors of the group delivering the power signals with the group providing the data signals and the groups providing the separation, the reduced cross section can be achieved while continuing to minimize noise and interference onto the data signals due to the power signals.