Abstract: An alternator includes an exciter field device generating an exciter magnetic field in a first air gap, an exciter armature device configured to rotate with respect to the exciter magnetic field and impart a first voltage in a first set of coils at the first air gap, a main stator device including a second set of coils, and a rotor field device configured to be energized by the first current in the first set of coils and generate a main magnetic field that imparts a second voltage on the main stator device at a second air gap. The main stator device and the exciter field device lie in on a common plane normal to an axis of rotation, and the exciter armature device is inwardly spaced from the exciter field device, main stator device, and the rotor field device.

Abstract: A motor for an air compressor is provided. The motor includes a stator including a first coil to generate a magnetic flux for driving the motor and a second coil positioned in a space the same as a space for the first coil to increase an inductance, and a rotator to mutually interact with the stator to rotate.

Abstract: A motor is provided, which has a larger torque and a high power factor in lower rotation speeds and a high power factor and a field weakened characteristic in a higher rotation speed range. The motor is provided with a long-hole shaped slit arranged between a rotor magnetic pole and a further rotor magnetic pole located adjacently to the rotor magnetic pole in a circumferential direction, a permanent magnet arranged in the slit, and a non-magnetic member arranged closely to the permanent magnet in a direction of magnetic fluxes. For large torque, this configuration reduces variations in rotor field magnetic fluxes, due to torque current components. In the rotation speeds, magnetic fluxes from the permanent magnet is suppressed from causing excessive field magnetic fluxes, which balances larger torque with higher power factors and a field weakened characteristic with higher power factors.

Abstract: The invention relates to a magnetic resonance imaging (MRI) system with emergency quench.

Abstract: A coil assembly in which a slack can be formed in a coil wire without increasing assembly cost, and a stepping motor using the same, are provided; the coil assembly includes a bobbin 232 having flange portions 233 and 234 at both ends thereof, multiple terminal pin embedding portions 235a arranged at one flange portion 234, a terminal pin 236 embedded in the terminal pin embedding portion 235a, and a coil 231 of which an end portion of coil wire 237 is entwined around the terminal pin 236, the coil wire 237 wound around the bobbin 232, in which a concave portion 238 which concaves to a radial direction of the bobbin 232 and penetrates to an axial direction of the bobbin 232 is formed between the terminal pin embedding portions 235a, the coil wire 237 exists from a base portion of the terminal pin 236, passes through the concave portion 238, started to be wound around the bobbin 232, and has a slack portion 237a which exists in the concave portion 238.

Abstract: A power relay assembly is provided. A power relay assembly according to an exemplary embodiment of the present invention comprises: an upper case having at least one electric element mounted on one surface thereof; a lower case coupled to the upper case; and at least one bus bar electrically connected to the electric element, disposed between the upper case and the lower case, and including a bottom portion that is in surface contact with at least one of the upper case and the lower case, wherein at least one side of the bottom portion contacts a portion made of a plastic material having heat dissipation and insulation properties in the upper case and the lower case.

Abstract: A cooling device (40) includes a heat exchanger (50), a first flow loop (52) connecting a cold sink (42, 44, 46) and the heat exchanger, and a second flow loop (54) connecting a hot sink (20) and the heat exchanger. A first passive one way valve (62) disposed on the first flow loop is oriented to allow flow in an allowed direction of flow (F1) and to block flow in the opposite direction. A second passive one way valve (64) disposed on the second flow loop is oriented to allow flow in an allowed direction of flow (F2) and to block flow in the opposite direction. The allowed directions of flow produce counter-flow in the heat exchanger. In an illustrative embodiment, the hot sink is comprises a cryogenic magnet coil (20) and the hot sink is a cold head (42, 44) and liquid helium tank (46).

Abstract: A high rotor pole switched reluctance machine (HRSRM) employs an axial and radial mirroring concept and is represented by a first Multiple Rotor Pole (MRP) formula and second Multiple Stator Pole (MSP) formula. A multiple rotor HRSRM comprises at least two rotors each having a plurality of rotor poles and at least two stators having a plurality of stator poles. The at least two rotors and the at least two stators are positioned about a central axis with the stator placed between the rotors. In other embodiments, the number of stators equals the number of rotors and effectively operate as a single stator and rotor. In yet another embodiment, the effective single stator and rotor type high rotor pole switched reluctance machine is realized as single stator and rotor positioned concentrically around a central axis.

Abstract: A magnetic transmitter including at least one magnetoelastic element, a magnetic field source, and an actuator operably coupled to the magnetoelastic element. The magnetoelastic element is oriented parallel to the magnetic field source. The magnetic field source is configured to induce a magnetic flux in the magnetoelastic element, and the actuator is configured to induce harmonic vibration in the magnetoelastic element. The magnetoelastic element is oriented parallel to the magnetic field source. The harmonic vibration of the magnetoelastic element is configured to change a net magnetic dipole of the magnetic transmitter due to magnetostriction.

Abstract: The disclosure relates to the technical field of motor driven, and in particular to a current-controlled motor. The motor includes a rotator assembly, a stator assembly, external connectors and bearings, wherein the stator assembly is in driven connection with the rotator. And the rotator assembly is connected with the bearings which connected with the external connector. Two capacitance structures are formed by the outer surfaces of the two ends of the rotator assembly and the inner surface of the relative position of the external connector with air gap between them.

Abstract: A cooling structure is provided that cools a rotor in a motor. The motor includes a shaft that is rotatably supported on a case and a rotor having a rotor core to which a plurality of magnets are provided on an outer periphery of the shaft and which is disposed to face a stator. Flow passages are formed on the shaft and the rotor and cooling oil passes through a core flow passage inside the rotor core from an introduction flow passage on a first side in an axial direction of the shaft and flows to the introduction flow passage on a second side in the axial direction of the shaft. An inlet communicating with the introduction flow passage and an outlet communicating with the introduction flow passage are formed in the case.

Abstract: A superconducting magnet apparatus includes a first superconducting coil centered around an axis extending in a direction intersecting with a vertical direction and a refrigerant circulation circuit through which refrigerant circulates. The refrigerant circulation circuit includes a first cooling pipe path in thermal contact with the first superconducting coil, an upper pipe path arranged above the first cooling pipe path, a lower pipe path arranged below the first cooling pipe path, and a connection pipe path that connects the upper pipe path and the lower pipe path to each other. The first cooling pipe path includes a first storage portion where refrigerant is stored.

Abstract: A switch device may include a rotatable knob provided to be rotatable around a first axis and capable of swinging around a second axis in parallel with the first axis. The switch device may also include a magnet disposed coaxially with the second axis and configured to rotate in conjunction with rotation of the rotatable knob. The switch device may also have a magnetic sensor provided on a fixed-side member and disposed to face an outer periphery of the magnet. The switch device may further include a gear train configured to transmit the rotation of the rotatable knob to the magnet.

Abstract: A magnet (7) for use in an apparatus (1) for performing magnetic resonance imaging (MRI) of a patient's head is an asymmetric magnet (7) comprising a plurality of coils (45, 46, 47) that are aligned along a cylindrical axis (29) to provide a magnetic field on the cylindrical axis (29). The magnet (7) has a patient end (23) arranged to be positioned adjacent or against a patient's shoulders with the patient's shoulders outside the magnet (7). The magnet has a recess (27) for receipt of the patient's head and extending into the magnet (7) from the patient end (23). The magnet (7) is configured to provide an imaging volume (35) that is positioned along the cylindrical axis (29) of the magnet (7) in the recess (27), and at least a major part of the imaging volume (35) has a substantially linear non-zero magnetic field gradient along the cylindrical axis (29).

Abstract: The present invention is an electrical machine comprising a stator and a rotor (10). The rotor is formed with a rotor body comprising a stack of laminations placed on a rotor shaft. The rotor includes at least one cavity with at least one arm for retaining at least one balancing weight.

Abstract: An acoustic noise mitigation system for an electric machine includes one or more suspension members. The suspension members may include arcuate members that are positioned between a machine housing and a stator. During operation of the electric machine, the electromagnetic force frequency that is generated by the stator relative to a rotating rotor is able to be absorbed by the suspension members. As a result, acoustic noise generated by the electric machine is reduced.

Abstract: A rotary position sensor comprising a rotatable patterned ring magnet, which in one embodiment is mounted on the output shaft of an actuator, and includes a plurality of pairs of North and South Pole sections extending around the circumference of the ring magnet in an alternating relationship and defining a plurality of circumferentially extending magnetic field switch points spaced predetermined distances on the ring magnet corresponding to a plurality of predetermined unique positions of the ring magnet adapted for sensing by a switch such as Hall Effect switch. In one embodiment, the ring magnet includes a plurality of pairs of North and South Pole sections and switch points on the ring magnet of different predetermined lengths and predetermined locations respectively corresponding to a plurality of predetermined ring magnet positions to be sensed.

Abstract: A multi-phase electric machine having plurality of windings are mounted on the stator core that define a plurality of phases wherein, for each phase, the windings include at least two parallel windings, each winding comprising a pair of continuous wires. For each pole, the parallel windings fill one or more central slots and two outer slots. Each winding fills each central slot twice the number of times that the winding fills each outer slot to thereby define a slot fill ratio of 2:1 between central slots and outer slots and wherein each wire of the wire pair forming a winding fills the slots in a ratio that differs from the slot fill ratio. Each of the parallel windings includes a phase shift end loop that shift the windings from one outer slot to the other outer slot.

Abstract: A magnetic motor comprising a rotating flywheel coupled to rotate a drive output shaft within a support cage. Multiple permanent magnets extend directionally from the flywheel. Pairs of positionally fixed electro-magnets extend from the cage effacing platforms for sequential selective magnetic interaction with permanent magnets rotatable driving the flywheel and the drive output shaft.

Abstract: A programmable pushbutton breaker switch having a pushbutton, a plurality of amperage indicating light emitting diodes (LEDs), a plurality of breaker circuits, and a plurality of LED light pipes in an interior of the pushbutton. Each of the LEDs is associated with a specific breaker circuit and with a specific light pipe. Light from a specific LED passes through a specific LED light pipe and produces an indicator light on the top of the pushbutton. The indicator light identifies an amperage amount, shown on the top of the pushbutton, of a specific breaker circuit. A programming switch inside the programmable pushbutton breaker switch allows the operation of the pushbutton to select a desired breaker amperage amount from a plurality of breaker amperage amounts shown on the top of the pushbutton and to set and store the desired amperage amounts in the programmable pushbutton breaker switch.