862results about "Synchronous machine details" patented technology

An electric rotary machine is disclosed which can adjust relative angles of sub-rotors continuously and regardless of torque direction without generating an attractive force between the field magnets of the sub-rotors. The electric rotary machine includes: a stator having a winding; a dual rotor which is rotatably disposed with a gap from the stator and divided axially along a shaft into a first rotor and a second rotor each having field magnets with different polarities arranged alternately in a rotation direction; a mechanism for varying the axial position of the second rotor relative to the first rotor continuously; and a non-magnetic member located between the first rotor and the second rotor.

Electric rotary current machine that includes a casing and a stator fitted within the casing. The stator has at least one stator winding. At least two mechanically separate rotors are rotatably mountable within the casing and have a same axis of rotation. In this way, each rotor has electromagnetic interaction with the stator when the stator is electromagnetically active. The rotor speeds are the same or different. A motor control is arranged to control a supply to at least one of said at least one stator winding by superposition of at least two rotary field components, one for each rotor.

A high power low RPM direct current electric motor is disclosed whereby the high power output is achieved in one of two ways or both. In the first case, the need for cooling is reduced simultaneously along with an increase in the utilization of the magnetic field present in the motor permanent magnets. This is achieved by wrapping the electromagnet core with windings that are capable of demagnetizing the rotor permanent magnets under stall conditions. Interlocking motor circuitry is provided which prevents the full activation of these motor windings until motor RPM values reach a safe level. This increases motor power while decreasing resistive losses in electromagnet windings. In the second case, the rotary portion consists of a large diameter relatively flat rotor containing permanent magnets and having built in vanes for moving air over the electromagnet stator windings providing forced air cooling.

A synchronous AC motor has a stator with stator poles arranged as a plurality of circumferentially extending stator pole groups, with each stator pole group having a pair of corresponding circumferentially extending loop-configuration stator windings disposed adjacent on either side or a single such winding disposed adjacent at one side, adjacent stator pole groups being mutually circumferentially displaced by a fixed amount corresponding to a specific electrical phase angle. A rotating magnetic field is produced by applying respective polyphase AC voltages to the windings, such that currents of mutually opposite direction flow in each pair.

A variable reluctance motor and methods for control. The motor may include N motor phases, where N equals three or more. Each motor phase may include a coil to generate a magnetic flux, a stator and a rotor. A flux-carrying element for the rotor and/or stator may be made entirely of SMC. The stators and rotors of the N motor phases may be arranged relative to each other so that when the stator and rotor teeth of a selected phase are aligned, the stator and rotor teeth in each of the other motor phases are offset from each other, e.g., by an integer multiple of 1/N of a pitch of the stator or rotor teeth. A fill factor of the coil relative to the space in which it is housed may be at least 60%, and up to 90% or more. The stator and rotor flux-carrying elements together may include at most three separable parts.

In a magnet-exciting rotating electric machine system, a rotor surface has magnetic salient poles and island-shaped magnetic poles alternately in circumferential direction, and the island-shaped magnetic poles are constituted so that magnetic flux coming from an external source does not flow through. A magnetic excitation part magnetizes the island-shaped magnetic poles and the magnetic salient poles collectively in the same direction, and then control a flux amount flowing through an armature. The armature has armature coils that face the magnetic salient pole and the island-shaped magnetic pole simultaneously so that driving torque fluctuation or power generation voltage waveform distortion is controlled. The magnetic excitation part changes magnetization state of a field magnet irreversibly, or changes an excitation current to an excitation coil to control a flux crossing the armature.

A rotary electrical machine such as a motor vehicle alternator comprises a stator and a rotor. The stator has at least one armature winding in at least one pair of stator slots. The rotor includes means for selectively establishing closed magnetic circuits which pass around the turns of the armature winding or windings. The means for setting up closed magnetic circuits comprise at least two permanent excitation magnets which set up two magnetic fluxes having components in opposite directions according to the direction of displacement of the rotor; and, between each pair of successive magnets, at least one excitation winding having two wires and being arranged to produce in an adjustably way two flux components which are such as to oppose the fluxes set up in the magnets of the pair. The wires of the excitation windings are located in rotor slots, each of which lies between two successive rotor poles.

An electric motor (10) has a field pole formed by a field current passing through a field winding (50). A voltage booting converter (120) converts output voltage of a battery (B) and outputs the voltage between a power source line (107) and a grounding line (105). Field winding (50) is electrically connected onto an electric current channel between battery (B) and power source line (107) and formed so that voltage switched by a switching element (Q1) is applied to both ends. A controller (100) controls the field current so as to adjust density of magnetic flux between a rotor and a stator by performing switching control on switching element (Q1) and a switching element (Q3) connected in parallel to field winding (50) and converts the output voltage of battery (B) into voltage in accordance with a voltage command value.

An electrical machine includes a stator and a rotor. The stator includes on its internal face at least one induction winding housed in a pair of recesses and a series of housings for excitation means. The rotor does not have windings and includes teeth for establishing variable magnetic fluxes in the induction winding. The excitation brings into play permanent magnets adapted to establish a closed circumferential magnetic flux in the stator and excitation windings locally establishing an adjustable magnetic flux in the reverse circumferential direction. The rotor teeth are adapted to effect a flux commutation in the stator and the, or each, permanent magnet occupies an angular position located between the angular positions of the two arms of a common induction winding. In this way an alternating magnetic flux is produced in the induction winding or windings during the rotation of the rotor.

A flat linear oscillation motor comprises an upper cover, a base matched with the upper cover to form a holding space, a coil which contained in the holding space and positioned on the base, an elastic supporting piece connected with the base and a permanent-magnet that is hung in the holding space by the elastic supporting piece; wherein, the base is provided with a plurality of side walls and a bottom wall being vertical to the side walls, the coil is arranged on the bottom wall and positioned in the center under the permanent-magnet, a gap is arranged between the coil and the permanent-magnet, the magnetic pole of the permanent-magnet just faces the coil, and the polarization direction of the magnetic pole of the permanent-magnet facing the coil is opposite, the elastic supporting piece is provided with a fixing part connected with the base, an elastic arm that extends out from and faces the fixing part and has the elastic deformation direction to be parallel to the bottom wall of the base, and a jointing part that extends out from the elastic arm and is connected with the permanent-magnet to lead the permanent-magnet to move along the direction being parallel to the bottom wall.

An electromagnetic apparatus has a rotating element acting as a transfer bridge between two active energetic suppliers, the rotating element providing a ferromagnetic core with plural solenoid coils having induced electric energy from external permanent magnets; the core transferring energy by induction to the inner stator's wound active permanent magnet, the energy collector and inductor acting as a generator.

Permanent-magnet (PM) rotors, rotor components, and machines using PM rotors, where the PM rotors have internally coupled PM bulks and/or are configured to have a non-uniform air gap between the rotor and a stator.

A synchronous electric machine having a fixed stator, a multi-phase stator winding and having a rotor which has poles, excited in a predefined sequence, over its circumference, the number of poles being changeable as a function of the intensity and the direction of a field current in at least one field coil of the rotor. For improving the efficiency of the machine and for reducing the number of field coils and the entire coil cross section it is provided that the rotor has a laminated core, laminated in the axial direction, which has grooves on the circumference for accommodating the at least one field coil and that the at least one field coil is situated on the circumference of the rotor with a step size which corresponds to the pole pitch of the lower number of poles.

The invention relates to the generator technology and in particular to a two-rotor axial magnetic flux switching type mixed excitation synchronous generator which has high efficiency, direct driving and variable speed and constant frequency; the generator comprises a stator and rotors; the stator is assembled to be round by 6a H-shaped unit stator cores, a is positive integer, an armature windingadopts a concentrated winding which is circumferentially wound on a stator tooth adjacent to the H-shaped unit stator core, permanent magnets are arrayed between the adjacent H-shaped unit stator cores in a staggering way, the permanent magnet charges the magnetism tangentially, an exciting winding is axially wound on the surface of the permanent magnet, so as to generate circumferential magneticfield by direct current in the exciting winding and enhance or weaken the permanent magnet field; the rotor comprises a rotor magnet yoke and a rotor pole fixed at the inner side of the rotor magnet yoke, the rotor and the stator are arranged axially. The invention is a novel mixed excitation synchronous generator which has high efficiency, direct driving and wide voltage regulating range.

A rotating electrical machine, such as an aircraft starter-generator, that includes an exciter that has its stator windings supplied with electrical power from a power supply. One or more switches are electrically coupled between the exciter stator winding and the power supply and are configured and controlled so that a capacitance may be selectively placed electrically in series with the exciter stator windings.

The invention provides an apparatus integrating an underwater motor and a thruster, comprising a motor casing and end covers respectively arranged at two ends of the motor casing. The clearance between the end cover and the motor casing is sealed; a stator core embedded with a three-phase winding is fixed on the inner side of the motor casing; a rotor provided with a fixing shaft at one end and a transmission shaft at the other end is arranged through a bearing inside the motor casing and the transmission shaft is extended out of the end cover and a screw propeller is fixed on the transmission shaft; the sintered NeFeB is stuck onto the rotor; a locating sensor is arranged on the stator core; a controller is arranged inside the motor casing and the three-phase winding and a controller arranged on the stator are respectively connected with the controller through lead; a control cable of the controller is derived out from the end cover of one end; and an air deflector is fixed through a bracket on the motor casing. The adoption of the high-grade sintered NeFeB as alnico largely reduces the motor volume and weight so as to lead the integral structure to become compact and enhance the total efficiency.

The present invention deals with a transverse flux machine of the switched reluctance variety. The transverse flux machine consists of multiple phases where each phase is spaced axially along the shaft. Axial spacing provides many benefits including a decreased weight and a capability to use simple wound bobbin coils for the windings. An embedded cooling loop is provided within the coils themselves. This cooling loop provides internal temperature regulation for the windings and allows for a higher efficiency among other benefits.

A rotary electrical machine has at least one stator and a rotor. The stator includes at least one armature winding received in at least one pair of slots. The rotor includes flux switching arrangement, which is adapted for selectively establishing closed magnetic circuits which pass around the turns of the armature winding. The arrangement for switching the flux comprises at least one permanent magnet adapted to establish a magnetic flux which is looped on itself in one circumferential direction of the rotor, together with at least one excitation winding for establishing an adjustable magnetic flux locally in a circumferential direction opposite to the direction of the flux produced by the magnets.

The present invention discloses a hybrid excitation motor. The comprises a stator and a rotor which are coaxially sleeved with each other; grooves are formed in the inner wall of the stator which sleeves the rotor or the rotor which sleeves the stator along the circumferential direction of the inner wall; grooves are formed in the outer surface of the rotor which is sleeved with the stator or the stator which is sleeved with the rotor; a direct-current excitation winding and an alternating-current armature winding are arranged in the stator grooves; each stator tooth is provided with protrusions which protrude out from the corresponding groove and are located at side surfaces of two sides of the groove; each protrusion is provided with a permanent magnet; the polarities of the two permanent magnets arranged at the two side surfaces of each stator tooth are the same; and the polarities of the permanent magnets of two adjacent teeth are opposite. When the motor of the invention operates at a low speed, current in the direct-current winding is positive, a total excitation magnetic field can be enhanced, and the overload capacity of the motor can be improved; and when the motor operates at a high speed, the current in the direct-current winding is negative, the total magnetic field can be weakened, and the flux weakening ability of the motor can be improved. The excitation motor of the invention has the advantages of low risk of irreversible demagnetization of the permanent magnets, small magnetic resistance of excitation magnetic fields, strong flux adjustment ability of the excitation windings and reliable and stable operation. According to the motor of the invention, slip rings and electric brushes are not needed, and therefore, problems such as the problem of sparks can be avoided.

In a rotating electric machine using permanent magnets and a field control coil, to allow the properties of the rotating electric machine to be readily changed and the rotating electric machine to be adapted to various applications even when it is made of common component parts, the field control coil is adapted to superimpose magnetic flux components of different intensities onto magnetic flux components that are supplied by the magnet poles and iron poles to the teeth, respectively. The magnetic flux components may be differentiated by placing each permanent magnet in a recess defined in an inner circumferential surface of the yoke, and defining each iron pole by a part of the yoke located between an adjacent pair of the permanent magnets in such a manner that the inner circumferential surface of each permanent magnet is lower than the said part of the yoke.

An arc-driven large-bore astronomical telescope is driven by a RE permanent-magnet synchronized arc motor. A control mechanism includes an upper machine and a lower machine; the upper machine is connected with the lower machine through serial communication; the lower machine carries out the real-time control; a motor stator is composed of 15 blocks, each block consists of 9 complete silicon steel plates and two silicon steel plates for reducing the edge effect; an armature winding is arranged according to UVWUVWUVW from right to left; a rotor is composed of 4 blocks and has 120 magnetic steel plates in total, the rotor adopts the torque design for reducing tooth space and is provided with a fastening device; an absolute coder and an incremental coder are simultaneously arranged in the control mechanism signal collecting and comparing links, the former is used for the turnover of a servo motor and the latter is used for testing the position of the servo motor; the signal of the coder is transferred to the DSP module of the lower machine through a singlechip; a drive circuit adopts a digital-driven intelligent power module. The present invention can achieve the needs of long-time, high-precision tracing and observing various celestial bodies and meet the requirements of precision and wide speed regulation in astronomic observation.

A rotor core has permanent magnets. Magnetic flux of the permanent magnet of an even-numbered rotor magnetic pole part is guided in an axial direction by an axial magnetic path member. Magnetic flux of the permanent magnet of an odd-numbered rotor magnetic pole part is guided into a soft magnetic inner cylindrical part. The axial end faces of the inner cylindrical part and the axial magnetic path member protrude from the rotor core in the axial direction and face a stationary magnetic path member with a small gap therebetween. The amount of magnetic flux of the magnet, which the permanent magnet applies to a stator core is adjusted by an excitation current of an excitation coil wound on the stationary magnetic path member.

In a magnet-exciting rotating electric machine system, every magnetic salient pole group to be magnetized in a same polarity is collectively magnetized by a magnetic excitation part. In the magnetic excitation part, a main magnetic flux path in which a magnetic flux circulates through the armature and a bypass magnetic flux path are connected to the field magnet in parallel. Magnetic flux amount in each path is controlled by mechanical displacement. Thereby, the rotating electric machine system and the magnetic flux amount control method in which magnetic field control is easy are provided. Also, means and method are provided so that a power required for the displacement may be made small by adjusting magnetic resistance of the above magnetic flux path.

A motor includes a stator having first and second armatures to form a rotating magnetic field, an inner rotor having first and second permanent magnets, and an outer rotor arranged between the stator and the inner rotor. The outer rotor has a rotor body which supports first and second induction magnetic poles such that they are embedded therein. A phase of the first induction magnetic pole is matched with a phase of the second induction magnetic pole. The first and second induction magnetic poles are assembled to the rotor body such that they are inserted into linear slits formed in the rotor body in the axis direction. Because the first and second induction magnetic poles are aligned in the axis direction, the outer rotor has a simple structure and an increased strength, and also support and assembling of the first and second induction magnetic poles in the outer rotor are facilitated.

The invention relates to a rotating electric machine, especially an alternator or alternator/starter for motor vehicles, including a stator surrounding a rotor (10) equipped with a pack of metal plates, a gap between the stator and the rotor, permanent magnets integrated into the rotor and excitation coils (14) integrated into the rotor, in which the excitation coils are wound around salient poles (1310) cut out in the pack of metal plates of the rotor, and the permanent magnets are accommodated in housings (13110) formed in the pack of plates of the rotor and open towards the periphery of the rotor, characterized in that the housings (13110) are closed axially at each of their ends by a non-magnetic retaining piece (13) equipped with a part intended to come into abutment with the magnets, and in that the retaining piece features recesses for accommodations [sic] of the buns of the excitation coils (14).

The invention provides a swarm unmanned aerial vehicle system. A plurality of unmanned aerial vehicles participating in task execution are arranged into a plurality of logical groups hierarchically, the formation of the logical groups and the operation of wireless peer node devices in the logical groups do not require the participation of a server, the logical group of the minimum unit forms an adhoc network, the ad hoc network comprises a group leader node and a plurality of group member nodes, the group leader node broadcasts information to each group member node, performs authentication and communication with each group member, and also reports the logical group members of the logical group and related information of each group member to a management node of an upper level; and the group member node receives the broadcast information of the group leader node, and changes own network configuration and channel according to the received broadcast information, and also executes tasks according to the command of the group leader node. By adoption of the system provided by the invention, the unmanned aerial vehicles participating in task execution can cooperatively executes the tasks, thereby enhancing the task execution ability.

An electrical machine is provided. The electrical machine includes a rotor comprising an inner rotor having a plurality of inner rotor poles and an outer rotor having a plurality of outer rotor poles. The electrical machine further comprises a stator configured to modulate a magnetic flux and to transmit torque to inner rotor and the outer rotor, the stator comprising a stator core interposed concentrically between the inner rotor and the outer rotor; a multiple of stator windings disposed in a plurality of stator slots, the stator windings configured to form a multiple of stator poles. The stator further comprises a plurality of stator teeth interposed between the plurality of stator slots, wherein an arithmetic sum or difference of twice number of stator teeth and a number of the stator poles equals a number of rotor poles.

A sintered magnet according to the present invention is a sintered magnet configured from a magnetic powder grain having Nd₂Fe₁₄B as a main component, in which: fluorine, a heavy rare earth element, oxygen, and carbon are segregated in part of grain-boundary regions of said sintered magnetic powder grain; concentration of the carbon is higher than concentration of the fluorine at a grain-boundary triple junction of the grain-boundary region; and concentration of the heavy rare earth element decreases from said grain-boundary triple junction toward an inside of said magnetic powder grain.

An external-rotor type permanent-magnet generator for vehicles: a rotor and a stator are both mounted in a housing which consists of a front end cover and a rear end cover; the stator is firmly arranged on the rear end cover; the permanent-magnet rotor is positioned outside the stator; a centrifugation fan is mounted on the rotor in the rear end of the rotor; the permanent-magnet rotor is composed of a rotor case and a tile-shaped permanent magnet; the front end of the rotor case comprises a vent hole; a centrifugation fan is exposed to mount in the vent hole. During operation, the rotor is driven to rotate via an engine, so that two cooling air circuits will be formed inside the motor: one circuit is a cooling air circuit formed by the centrifugation fan on the rear end of the rotor; the circuit is mainly used to cool the rectification voltage stabilizer; the other circuit is a cooling air circuit that is formed with the rotor centrifugation fan exposed out of the rotor housing; the circuit mainly adapts to cool the rectification voltage stabilizer and the stator. Compared with the prior art, the invention has advantages of high utilization rate of iron core materials, convenient stator coiling, simultaneous effects with the two centrifugation fans, perfect heat radiation effects, low temperature of the stator and the rectification voltage stabilizer, and reliable operation.

A permanent magnet motor operated by the magnetic interaction between two or more permanent magnets, and a control system therefor, is provided. The permanent magnet motor may be a piston motor having a magnetic piston assembly mounted on a crank shaft, and a rotatable cam shaft having a cam magnet corresponding to the piston assembly. When the cam shaft rotates about an axis, the poles of the cam magnet alternatingly face the adjacent magnetic pole of the corresponding piston magnet. The magnetic field interactions between the piston magnet and the cam magnet cause the piston to reciprocate within the cylinder. The permanent magnet motor may also be a rotary motor comprising a rotor having a plurality of rotor magnets, and a stator having a stator magnet. A stator motor drives the stator causing the rotor to rotate in response to alternating interactions between magnetic fields of the stator magnet and rotor magnets. A vehicle comprising a permanent magnet motor is also disclosed.