10results about How to "Reduce thrust fluctuation" patented technology

The utility model discloses a magnetism gathering type linear motor, comprising a stator comprising a stator yoke portion extending along the X-axis direction and a plurality of stator tooth portions arranged on the stator yoke portion at intervals along the X-axis direction; the mover is arranged opposite to the stator in the Y-axis direction, and the mover comprises a mover yoke part and an iron core monomer connected with the mover yoke part; each single iron core comprises an iron core end part and first permanent magnets and second permanent magnets which are arranged on the iron core end part, the magnetizing directions of the first permanent magnets and the second permanent magnets are not parallel, the first permanent magnets and the second permanent magnets are alternately arranged along the X-axis direction, the number of the first permanent magnets is N, the number of the second permanent magnets is N-1, and N is greater than or equal to 2; the stator tooth part comprises a stator top wall adjacent to the iron core single body and two first stator side walls connected to the two sides of the stator top wall in the X-axis direction, and a chamfer structure is formed between the stator top wall and the first stator side walls. By adopting the structure, the magnetic gathering effect is obvious, and the cogging force of the motor is effectively reduced.

The invention discloses a thrust fluctuation suppression method for a polygonal permanent magnet synchronous linear motor, belongs to the field of permanent magnet motors, and aims at solving the problems that three-phase windings of an existing polygonal permanent magnet synchronous linear motor are asymmetric, and thrust fluctuation is large. Armature windings in different primary modules act with permanent magnets of secondary modules to achieve symmetry, and the method comprises the steps that the armature windings of the four primary modules are independently wound in the respective modules, and then the armature windings of each phase of the four primary modules are connected in series or in parallel to form a phase winding; wherein the armature windings of the two primary modules corresponding to the two long sides of the secondary are arranged in any two of A-B-C, B-C-A and C-A-B; the two short edges are arranged in the same way corresponding to the two short edges of the secondary side and are arranged in the remaining way; and the lamination thickness of the two adjacent primary armatures is twice. The armature winding arrangement mode is that the initial position of the A-B-C primary module is 2k tau, the initial position of the B-C-A is 2k tau-(2tau / 3 * 2P), and the initial position of the C-A-B is 2k tau-(tau / 3 * 2P).

The present invention provides a low thrust fluctuation modular primary winding segmented permanent magnet linear motor, including a secondary component and a primary component, at least one pair of secondary components are provided, and a permanent magnet with alternating polarity is pasted on the secondary core; the primary component adopts a multi-module segmented structure, characterized in that: each primary component is provided with matching sub-laps and mother-laps at both ends, two adjacent primary components are assembled and combined by sub-laps and mother-laps, and the width of the end coils at the matching positions of the sub-laps and mother-laps in the primary component is less than or equal to the width of the coils at the middle position. The primary component of the present invention adopts a splicing design of the primary component sub-laps and mother-laps, which can reduce the influence of the gap caused by the processing and assembly of the primary winding, and reduce the thrust fluctuation caused by the gap compared to the traditional motor, thereby achieving a significant reduction in the speed fluctuation of the mover and an improvement in the position control accuracy.

The invention provides a motor secondary assembly and a linear motor, the motor secondary assembly comprises a permanent magnet fixing plate and a permanent magnet assembly, and the permanent magnet fixing plate is provided with a permanent magnet mounting surface; the permanent magnet assembly comprises a first magnetic section and a second magnetic section, and the first magnetic section is provided with a first matching surface; the second magnetic section is arranged at the end part of at least one end of the first magnetic section in the first direction, the second magnetic section is arranged close to the first end of the permanent magnet fixing plate in the first direction, and the second magnetic section is provided with a second matching surface; and in the second direction, the distance between at least one part of the first matching surface and the permanent magnet mounting surface is L1, the distance between the second matching surface and the permanent magnet mounting surface is L2, and L1 is greater than L2. According to the motor secondary assembly provided by the invention, the size of the end part of the motor secondary assembly is reduced, so that the distortion of an air-gap magnetic field is weakened, the end part effect force generated by non-uniform magnetic field distribution can be effectively reduced, and the thrust fluctuation of the motor in the operation process is reduced.

The invention provides a secondary assembly for a linear motor, the linear motor, an electromagnetic suspension and a vehicle, and the secondary assembly comprises a first permanent magnet, and the magnetizing direction of the first permanent magnet is parallel to the first direction; the permanent magnet fixing plate is provided with a permanent magnet mounting surface, and the first permanent magnet is arranged on the permanent magnet mounting surface; the first permanent magnet comprises a first end face, a second end face and a first connecting face, the first end face and the second end face are sequentially arranged at intervals in the first direction, the first connecting face is arranged on the side away from the permanent magnet installation face, and the first permanent magnet further comprises a second connecting face which is arranged on the side close to the permanent magnet installation face. According to the scheme, the first connecting surface and the second connecting surface can be respectively arranged on the first permanent magnet, so that an easy demagnetization area of the permanent magnet is effectively removed, the irreversible demagnetization risk of the permanent magnet is reduced, and the thrust fluctuation of the linear motor is further reduced.

The application discloses a variable cycle engine double-loop closed-loop mode switching control method, which comprises the following steps: determining the tail nozzle network model parameters according to the dynamic thermodynamic mechanism analysis of a tail nozzle component, constructing a tail nozzle data-driven network model based on a BP neural network, and combining a component-level dynamic model of a main component in an upstream flow path to obtain a hybrid dynamic model of the variable cycle engine; according to the influence of an adjustable geometry component on performance parameters of the variable cycle engine, designing a double-loop closed-loop control scheme with variable speed and thrust feedback by taking thrust performance as an optimization target, and designing a mode switching control method of the model based on the hybrid dynamic model of the variable cycle engine. The tail nozzle model with a long time consumption in the variable cycle engine is simplified to reduce the time consumption of the whole machine dynamic model calculation, the double-loop closed-loop control scheme with variable speed and thrust and containing the mode switching process is proposed based on the model, and the stability of the variable cycle engine during mode switching can be effectively improved.

The invention discloses a three-section permanent magnet synchronous linear motor and a design and optimization method, and relates to the technical field of motors. An existing permanent magnet synchronous linear motor has remarkable problems in the aspects of thrust fluctuation, insufficient thrust output, low permanent magnet utilization rate, complex optimization process and the like, and the technical problems urgently need to be overcome through new design and optimization methods. According to the technical scheme, the three-section type permanent magnet synchronous linear motor is of a three-section type double-layer consequent pole permanent magnet structure and comprises a three-section type structure and a double-layer magnetic pole structure; the three-section type structure comprises at least two opposite convex iron poles, main magnetic poles are arranged at the top ends of the two opposite convex iron poles, and the auxiliary magnetic poles are arranged on the outer sides of the two main magnetic poles respectively and wrap the convex iron poles; the double-layer magnetic pole structure comprises an epoxy resin seal and a stator winding arranged in the epoxy resin seal; and the double-layer magnetic pole structure is arranged between the two opposite convex iron poles. And the method is suitable for being applied to the work of putting the PMSLM into various industrial fields.

The application discloses a high thrust density cylindrical linear motor based on a wave-shaped air gap, which is composed of a wave-shaped stator core, an armature winding, a wave-shaped permanent magnet and a mover core, a wave-shaped air gap is arranged between the stator and the mover in the circumferential direction, the air gap area is increased, the air gap magnetic flux density distribution is adjusted, and the output thrust quality is improved. A wave-shaped permanent magnet excitation structure is arranged on the mover, the stator tooth top is arranged in a wave-shaped distribution same as the permanent magnet excitation structure distribution in the circumferential direction, and the air gap length is ensured to be equal everywhere. The wave-shaped permanent magnet excitation structure is composed of a plurality of pairs of permanent magnets arranged in a wave-shaped distribution in the circumferential direction and stacked in the axial direction, can generate a magnetic aggregation effect, and improve the excitation capacity in the motor. The cylindrical linear motor disclosed by the application has the characteristics of large output thrust, high thrust density and high efficiency, and is suitable for application occasions such as numerical control machine tool machining, electromagnetic launching and automobile suspension systems which require high thrust and high efficiency.

The invention discloses a segmented power supply LPDSLIM current decoupling control method and device, and belongs to the technical field of motor control, and the method comprises the steps: setting a primary current reference value, and calculating a primary current angular frequency and a vector transformation angle based on the primary current reference value and a secondary speed; designing a complex vector controller, and performing closed-loop control on the primary current; self-adaptive damping feedback voltage and counter electromotive force are calculated and compensated, so that a compensated primary voltage reference value is generated; and inputting the primary voltage reference value into SVPWM (Space Vector Pulse Width Modulation) to generate an inverter driving signal so as to control the motor. According to the invention, effective decoupling of current control can be realized, and the method has high parameter robustness.

The invention relates to a control method and device for increasing thrust of a permanent magnet synchronous motor during high-speed operation. The method comprises the following steps: by constructing a double-loop control system for alternately controlling a speed loop and a current loop, periodically updating a power angle of a motor according to a first control period through the speed loop in a high-speed running process of the motor so as to control the motor to run according to the maximum thrust, and controlling the power angle of the motor to run according to the maximum thrust in the first control period; and compensating the power angle of the motor through the current loop according to the second control period so as to control the motor to operate according to the compensation thrust in the first control period. By adopting the method, a strategy of alternate control of a speed loop and a current loop can be adopted, and stable operation of the motor during high-speed movement is realized by compensating the thrust of the motor, increasing the average thrust of the motor and reducing thrust fluctuation while the motor is ensured to reach maximum thrust operation.