134results about How to "Reduce thrust fluctuation" patented technology

The invention discloses a modular primary permanent magnetic linear motor and a motor module consisting of the modular primary permanent magnetic linear motor. The modular primary permanent magnetic linear motor comprises a primary and a secondary, wherein the primary comprises m or 2m primary modules; each primary module comprises two U-shaped magneto-conducting materials and a permanent magnet between the U-shaped magneto-conducting materials; and taum, taus, tauul, tauu, wmt and wst satisfy the following relational expressions that tm is equal to or approximate to ktaus, tauul is equal to or approximate to (j+0.5) taus, tauul is equal to taum-tauul, and wmt is less than or equal to wst. Relative displacement between two primary modules which belong to the same phase is lambda1 which is equal to (n+/-0.5)taus or lambda1 which is equal to ntaus, and relative displacement between two primary modules which belong to different phases is lambda2 which is equal to (i+/-1/m)taus or lambda2 which is equal to [i+/-(0.5-1/m)]taus. The motor and the motor module have the advantages of symmetric counter potential, relatively low sine and positioning force, small thrust ripple and the like, and are applied to the places where a long secondary structure linear motor is applied.

The invention discloses a modular complementary type primary permanent magnet linear motor and a motor module formed thereby. The primary permanent magnet linear motor comprises a primary level and a secondary level; the primary level and the secondary level are respectively in a salient-pole structure, and an air gap is formed between the two levels; the primary level comprises a rotor module which comprises a first module and a second module; a first non-magnetic material is arranged between the first module and the second module; the first module and the second module both comprise two salient-pole magnetic materials and a permanent magnet arranged between the two salient-pole magnetic materials; the salient-pole magnetic material is provided with m numbered primary teeth, and a central armature winding is arranged on the primary teeth; the relative displacement between the first module and the second module is calculated as follows: lambda2=(k+/-0.5) tau s; the relative displacement between the adjacent two salient-pole magnetic materials is calculated as follows: lambda1=m*tau m; and the ratio of the primary polar distance to the secondary polar distance is as follows: tau m: tau s=(m+/-1):m. The invention has the advantages of symmetric back electromotive force, relatively small positioning force, low thrust fluctuation and the like and is applicable to the application occasion of a linear motor with a long-stator structure.

The invention relates to a permanent magnet linear voice coil motor with high thrust-weight ratio for a direct drive valve, comprising an inner stator, an outer stator, a magnetic steel component, a moving coil winding, a moving coil support and an end cover. The permanent magnet linear voice coil motor is characterized in that the magnetic steel component is two circular magnetic steel components which are bonded on the inner wall of the outer stator by a high-strength adhesive; the inner and the outer stators are both bonded on the end cover by adopting the high-strength adhesive; a spigot is processed on the end cover for realizing the mechanical positioning of the inner and the outer stators with the end cover; two annular air gaps are formed between the inner and the outer stators and the two annular magnetic steel components; the moving coil winding adopts two sets of windings, the numbers of turns of the two sets of windings are equivalent, and the winding directions are opposite, each set of winding is respectively arranged in the two annular air gaps constituted by the inner and the outer stators and the two annular magnetic steel components; the moving coil winding adopts a copper clad aluminum enameled wire, the wire winding method of the moving coil winding adopts the multi-layer flat winding; the moving coil support adopts a nylon rod with light weight, high strength and high temperature resistance; and a through hole is formed on the end cover.

The invention discloses a composite winding ironless linear permanent magnet synchronous motor and relates to a coreless linear permanent magnet synchronous motor, and solves a problem that when applied in the field of ultra-precision motion control, a linear secondary permanent magnet synchronous motor with double secondary coreless structure has large thrust fluctuation, low power density and large secondary eddy current loss. The composite winding ironless linear permanent magnet synchronous motor comprises a primary side and a secondary side. The primary side comprises a primary substrateand two primary windings. The two primary windings are arranged on the left and right sides of the primary substrate respectively. The windings in corresponding phases of the two primary windings areconnected in series. In the direction of motion, the windings in the corresponding phases of the two primary windings have a phase difference. The secondary side is a U-shaped bilateral structure andis arranged on both sides of the primary side. Two air gaps are arranged between the primary and secondary sides. The composite winding ironless linear permanent magnet synchronous motor is mainly applied to the field of ultra-precision motion control.

The invention relates to an internal heat radiation composite magnetic flux switching permanent magnet motor including two stators, two rotors, armature windings, permanent magnets, a magnet insulation ring, and radiating holes. In one aspect, internal and external rotors don't have permanent magnets and any excitation windings, so that the motor has the characteristic of firm structure; and in another aspect, the two rotors are provided with the permanent magnets and the armature windings and are connected through the magnet insulation ring, and the heat of the motor can be radiated from the inside through the radiating holes. A permanent magnet magnetic flux switching motor is kept in structure, the advantages of good robustness and high speed running can be achieved. The heat radiation of the side of the motor can be realized without additionally increasing the size of the motor, so that the motor can be high in reliability and good in overloading capability, and is suitable for the conditions requiring small size and high reliability and having bad heat radiation.

The invention discloses a magnetic field modulation permanent magnet linear motor capable of improving winding utilization rate and an optimization design method thereof, and belongs to the field of a permanent magnetism motor. The permanent magnet linear motor comprises a single primary side and double secondary sides. An air gap is arranged between the single primary side and each of the double secondary sides. The single primary side is formed by three unit modules. Each unit module is slotted in the sides close to the air gaps to form four primary teeth and two primary slots. The tooth end of each primary tooth is provided with a plurality of virtual slots and virtual teeth in the motor motion direction, wherein the number of the virtual teeth is larger by one than that of the virtual slots, and each virtual slot is embedded by a magnetic concentrating unit formed by three permanent magnets. Three phases of windings in the primary slots are wounded on yoke portions of the three primary unit modules respectively; and each phase of winding can cut magnetic force lines generated by the permanent magnets on the four primary teeth in the corresponding module simultaneously. The permanent magnet linear motor improves winding utilization rate, reduces half of the winding use amount and reduces copper consumption under the condition of ensuring that performance indexes of no-load counter potential, thrust output, permanent magnet use amount and fault-tolerant capability and the like are not influenced.

The invention discloses a coreless permanent magnet synchronous linear motor with double-layer reversely tilting windings. Mover coils in the permanent magnet synchronous linear motor are set as double-layer coil windings: upper-layer coil windings and alower-layer coil windings. The upper-layer coil windings and the lower-layer coil windings are set in planes where the upper-layer coil windings and lower-layer coil windings are in a tilting mode. Each pair of windings at upper and lower corresponding positions in the upper-layer coil windings and the lower-layer coil windings symmetrically tilt towards opposite directions by taking a center line as a symmetric center, thereby forming a double-layer reversely tilting winding form. According to the coreless permanent magnet synchronous linear motor with the double-layer reversely tilting winding, thrust ripples of the motor are clearly reduced, thrust density of the motor is improved, motor operation is relatively stable, motor processing precision is improved, and the motor is widely applied to precision machining.

The invention provides a unit-motor modularized permanent magnetism synchronous linear motor, and belongs to the technical field of a motor. The unit-motor modularized permanent magnetism synchronous linear motor is formed by a plurality of unit motors, wherein each unit motor includes a primary assembly and a secondary assembly, wherein the primary assembly is formed by a primary iron core and armature windings; grooves are formed in the primary iron core, and the armature windings are arranged in the grooves; the secondary assembly is formed by a permanent magnet and a secondary iron core; an air gap is located between the primary assembly and the secondary assembly; a magnetic modulation structure is arranged between two adjacent unit motors; the width of the magnetic modulation structure is that S=(k+1/3)Tau (k is an integer and Tau is the polar distance of the motor); the arranging sequences of the windings in the grooves of two adjacent unit motors are different; and the winding directions of the windings on the two unit motors are opposite. The structure is conductive to inhibition of end portion effect, and can improve asymmetry of three-phase windings of the permanent magnetism synchronous linear motor and reduce thrust ripple.

The invention discloses a fault-tolerate primary permanent magnetic vernier linear motor, which is applied to the field of high-reliability linear driving and comprises a primary winding, a secondary winding and an armature winding; the secondary winding is a simple salient pole structure with ladder-shaped teeth and is longer than the primary winding, an air gap exists between the primary and secondary windings, armature teeth with even number are uniformly distributed on the primary winding, a set of concentrated winding is wound on each armature tooth, a fault-tolerate tooth is arranged between adjacent two armature teeth, a permanent magnet with the magnetizing direction being parallel to the central symmetrical axis of the armature is attached to the lower face of each armature tooth, the permanent magnets are uniformly distributed on each armature tooth, the magnetizing direction of each permanent magnet is in N-S and S-N alternative arrangement, and the magnetizing directions of the permanent magnets on all armature tooth are same in arranging sequence; and the height of the fault-tolerate tooth is equal to the sum of the heights of the armature tooth with the face being attached to the permanent magnetic and the permanent magnet. The fault-tolerate primary permanent magnetic vernier linear motor is simple in structure, large in pushing force, small in pushing force pulse, high in reliability and strong in the running property of the motor with the fault and fault-tolerate property.

The invention provides a poly-phase alternating-current linear motor system for ring windings and belongs to the field of motors. The problems that due to the fact that traditional integer groove single-layer windings are adopted in a three-phase linear permanent magnet synchronous motor, the structure is complex, cost is high, the magnetomotive force and electromotive force harmonic components are large, thrust of the motor is large in ripple, efficiency is low, the lateral bracing span of a rotor is large, and the rotor is large in bracing difficulty are solved. The poly-phase alternating-current linear motor system for the ring windings comprises an m-phase alternating-current linear motor and m/3 three-phase power converters, wherein m=3k; the m-phase alternating-current linear motor comprises a primary level and a secondary level; the primary level comprises a primary iron core and m/3 primary ring windings and each primary ring winding is a three-phase ring winding; the electrical angle phase difference between corresponding phases of every two adjacent primary ring windings is delta and delta is +/- 180 degrees per meter. Three outgoing lines of each primary ring winding are correspondingly connected with alternating-current output ends of one three-phase power converter; a direct-current bus is shared by the m/3 three-phase power converters.

The invention discloses a linear motor with non-uniform teeth and without magnetic track, and relates to the technical field of a permanent-magnet linear motor. The linear motor comprises two parts comprising a rotor and a stator, wherein the rotor comprises a rotor yoke, rotor teeth, rotor tooth end parts, windings and permanent magnets, the stator comprises a stator yoke and stator teeth, the rotor teeth connected with the rotor yoke are arranged in a space in a non-uniform way, the permanent magnets are arranged at the rotor tooth end parts, the windings are arranged in grooves formed by the rotor teeth, and the stator teeth are connected to the stator yoke. The permanent magnets are not needed to be arranged on the stator, the linear motor is low in cost and is simple to install and transmit, and the motor is long in lifetime, small in electromagnetic interference and small in potential risk and has wide application prospect.

The invention provides a unit motor modular consequent pole permanent magnet synchronous linear motor and belongs to the motor technical field. The unit motor modular consequent pole permanent magnet synchronous linear motor is composed of a plurality of unit motors; each unit motor includes a primary assembly and a secondary assembly; the primary assembly is composed of a primary iron core and an armature winding, wherein the primary iron core is slotted, and the armature winding is arranged in the slots of the primary iron core; the secondary assembly is composed of permanent magnets, iron poles and a yoke plate, wherein the iron poles and yoke plate are integrally modeled; an air gap is left between the primary assembly and the secondary assembly; a magnetic adjusting structure is arranged between two adjacent unit motors; the width of the magnetic adjusting structure can be expressed as an equation that S=(k+2/3)tau, wherein k is an integer, and tau is the pole pitch of the motors; and the arrangement sequences of the windings in the slots of the two adjacent motor units are different. With the structure adopted, the suppression of an end portion effect can be benefitted, the asymmetry of the three-phase windings of the permanent magnet synchronous linear motor can be improved, and thrust ripples can be decreased.

The invention discloses a novel magnet-gathering type transverse flux permanent magnet linear motor which comprises stators and a rotor. The rotor is rectangular and is composed of two salient pole iron cores and a connecting board. The two salient pole iron cores are fixed to the two ends of the connecting board respectively and respectively provided with a groove. The groove of each salient pole iron core is provided with a permanent magnet and a winding. Multiple strip-shaped air grooves with equal intervals are evenly formed inside each stator. The salient pole iron cores at the two ends of the rotor are arranged in the two stators respectively. According to the novel magnet-gathering type transverse flux permanent magnet linear motor, a primary level and a secondary level are respectively of a salient pole structure, the independence between phases is good, and the high force density and fault tolerance are integrated; the use rate of stator space is high; the fault tolerance capacity is strong and operation reliability is high; fluctuation of the locating force and the pushing force is small and the control characteristic is flexible; the permanent magnets are placed in the primary-level rotor iron cores, so that the temperature is easy to control, the permanent magnet use amount is small, and the motor can be applied to the field with the high requirement for reliable operation of a system.

The invention discloses a temperature adjusting method and device of a motor, and a motor. The method comprises the steps of: obtaining the temperature of each part to be detected of a motor, whereineach part to be detected corresponds to at least one temperature adjusting part; detecting a difference value between the temperature of each part to be detected and a preset temperature; and controlling the temperature adjusting speed of the temperature adjusting part corresponding to the difference value, wherein the temperature adjusting speed shows the speed for adjusting the temperature of the corresponding part to be detected. The technical problem is solved that a current heat dissipation method cannot ensure the uniform whole temperature of the motor.

The invention discloses a ring winding magnetic field modulation linear motor, which belongs to the field of motors and solves the problems of material waste, complicated insulation process between windings, large motor thrust fluctuation and low frequency caused by the long end part of the traditional linear permanent magnet motor winding and the winding mode of the winding. The ring winding magnetic field modulation linear motor comprises a primary winding and a secondary winding, a gap exists between the primary winding and the secondary winding, by adopting pole-slot match between the primary winding and the secondary winding and the ring winding, non-uniform air gap permeance plays a role of pole changing, the magnetic motive force of the primary winding and the air gap permeance interact mutually, a magnetic field with the same pole number as secondary permanent magnets is generated, the two magnetic fields interact mutually to generate a constant thrust, and thus, the limitation that the pole number of the primary winding and the pole number of the secondary winding of the traditional linear permanent magnet synchronous motor need to be the same is further broken. The pole-pairs number P of the secondary permanent magnets, the slot number Q per side of the primary winding and the pole-pairs number S of the primary winding fundamental magnetic motive force meet the following relationship: P=Q+/-S. The ring winding magnetic field modulation linear motor can be applied to low speed, great acceleration, high output thrust and other situations.

The invention discloses a permanent-magnet linear motor based on an arc-shaped and inner-step shaped hybrid structure of a stator. The motor comprises a stator armature primary side and a Halbach permanent-magnet mover secondary side, the stator armature primary side is located on the outer side of the permanent-magnet mover secondary side, the stator armature primary side is formed by a stator iron core and an armature winding, inner-step shaped structures are adopted by the ends of two sides of the stator iron core, and arc-shaped structures are adopted by inner teeth of the stator iron core; the permanent-magnet mover secondary side is formed by a mover iron core and a permanent magnet adhering to the surface the of the iron core, and a Halbach array structure is adopted by the permanent magnet. By means of the motor, air gap magnetic flux larger than a conventional magnet can be obtained, the motor has a better magnetic shielding effect, and the thickness of a magnetic conductive yoke of the mover can be reduced. The invention provides an analysis model of an arc-shaped tooth structure, and the magnitude of magnetic conductance and a magnetic conductance-position variation curve can be derived by means of the model. The optimal structure of the motor is obtained by adopting a Taguchi optimization algorithm.