49results about How to "Suppression of thrust fluctuations" patented technology

The invention discloses a dual-mover modular permanent magnet linear motor capable of differential operation. The motor comprises an upper-layer rotor module, a lower-layer rotor module and a stator module; the stator module is arranged between the upper-layer rotor module and the lower-layer rotor module; the upper-layer rotor module includes a plurality of first E-shaped iron cores, and the opening direction of the first E-shaped iron cores faces the stator module; a magnetic isolation block is arranged between two adjacent first E-shaped iron cores; the lower-layer rotor module comprises aplurality of second E-shaped iron cores, the second E-shaped iron cores have the same structure as the first E-shaped iron cores, the opening direction of the second E-shaped iron cores faces the stator module, and a magnetic isolation block is arranged between two adjacent second E-shaped iron cores; the first E-shaped iron cores and the second E-shaped iron cores are both provided with windings;and the stator module comprises a permanent magnet group and a stator core. The modular structure of the invention facilitates expansion of the thrust range of the motor, weakens the thrust fluctuation of the motor, simplifies the maintenance difficulty of the motor and shortens the maintenance period.

The invention discloses a short-circuit fault-tolerant vector control method of an embedded mixed magnetic material fault-tolerant cylindrical linear motor, which includes establishing a five-phase embedded mixed magnetic material fault-tolerant cylindrical linear motor model; using the non-faulty phase current of the motor to compensate the short-circuit fault phase It leads to the lack of normal thrust of this phase and suppresses the thrust fluctuation caused by the short-circuit current of this phase; the expected phase voltage is obtained by adopting a series of coordinate transformation and voltage feedforward compensation strategies, and the CPWM modulation method based on zero-sequence voltage harmonic injection is used to realize the motor Fault-tolerant vector control after phase short-circuit fault. The invention can not only suppress the thrust fluctuation of the motor under the condition of phase short-circuit fault-tolerant operation, but more importantly, its dynamic performance, steady-state performance and normal performance are consistent, the switching frequency of the voltage source inverter is constant, and the CPU The overhead is small; when any one-phase short-circuit fault occurs, the natural coordinate system only needs to rotate a certain angle counterclockwise to realize fault-tolerant operation of the motor.

The invention discloses a double-side staggered-tooth tau / 2 low-thrust-ripple permanent magnet synchronous linear motor. A first primary assembly and a second primary assembly are both composed of anarmature winding and a primary iron core, each primary iron core is of a tooth groove structure, and the armature windings are wound on teeth; the first primary assembly and the second primary assembly are located on the two sides of a secondary assembly and form air gaps with the secondary assembly respectively; the secondary assembly comprises a yoke plate and a plurality of permanent magnets, each pair of poles comprises four permanent magnets, the first permanent magnet and the second permanent magnet of each pair of poles are located on the same side of the yoke plate, the third permanentmagnet and the fourth permanent magnet of each pair of poles are located on the same side of the yoke plate, the positions of the first permanent magnets and the third permanent magnets are opposite,the positions of the second permanent magnets and the fourth permanent magnets are opposite, the magnetizing directions of the first permanent magnets and the third permanent magnets are the same, the magnetizing directions of the second permanent magnets and the fourth permanent magnets are the same, and the magnetizing directions of the first permanent magnets and the second permanent magnets are opposite; the displacement of the first primary assembly and the second primary assembly in the transverse direction is S which is equal to tau / 2, and tau is the polar distance of the motor. By means of the structure, the thrust ripple of the motor can be reduced, and meanwhile unilateral magnetic tension and fluctuation of the unilateral magnetic tension are reduced.

The invention discloses a five-phase permanent-magnet embedded fault-tolerant linear-motor adjacent two-phase fault-tolerant vector control method. According to principles that traveling wave magnetomotive forces before and after a two-phase open-circuit fault are invariant and a non-fault-phase current sum is zero, a condition that non-adjacent two-phase current amplitudes are equal is taken as a constraint condition so as to derive and popularize a Clark transformation matrix; matrix transposition is used to estimate a counter potential; and an inner model controller, a first-order inertia feedforward voltage compensator and a counter potential observer are used to change a nonlinear strong coupling system of the motor under a fault state into a first-order inertia system. According to a principle that a synthesized magnetomotive force of a non-fault-phase short circuit compensation current and a short circuit fault phase current is zero, a short circuit compensation voltage is calculated. The voltage is superposed with an output voltage of a vector control device. By using the method of the invention, a motor thrust fluctuation caused by adjacent two phase faults of the motor is restrained, dynamic performance and stable state performance are consistent with the performance under a normal state, and a switch frequency of a voltage source inverter is constant.

The invention discloses a thrust fluctuation compensating secondary of an annular winding permanent magnet linear synchronous motor, which is composed of a plurality of plate-shaped secondary assemblies and forms a multi-faceted air gap structure with a primary armature with annular winding; the primary The cross section of the armature is rectangular, and the permanent magnet in the secondary assembly corresponding to its length interacts with the primary armature current to generate electromagnetic thrust. shift to achieve compensation for the electromagnetic thrust fluctuation component. The present invention can realize more stable electromagnetic thrust output while ensuring the improvement of thrust density and structural compactness.

The invention proposes a high-thrust-density electromagnetic actuator for a nano-satellite deployer, which is mainly composed of a stator and a mover. The stator mainly includes: a stator frame, a magnetic yoke, a magnetic ring and a lock nut; the mover mainly includes: a coil Skeleton and coil. The invention forms upper and lower double permanent magnetic branch magnetic fluxes on the single-layer magnetic pole, realizes the shunting of the permanent magnetic flux, effectively relieves the magnetic saturation of the magnetic yoke, reduces the thickness of the magnetic yoke, and has a single-layer magnetic pole and single-layer coil configuration. The axial size and volume mass of the actuator are reduced; the double permanent magnet branch circuit improves the air gap magnetic field distribution, reduces the thrust fluctuation and increases the thrust density. The invention has the characteristics of small size, light weight, high thrust density and stable thrust, and is very suitable for the deployer to release the nano-satellite on-orbit speed.

The invention provides an asymmetric magnetic barrier permanent magnet assisted reluctance synchronous linear motor, which belongs to the technical field of motors. It includes a primary component and a secondary component; the primary component includes a primary core and an armature winding; the primary core is slotted to form a primary core yoke, a primary core tooth and a slot; the armature winding is arranged in the slot, and the winding adopts a concentrated winding structure. The secondary component includes a secondary core and a permanent magnet; there is an air gap structure between the primary component and the secondary component, the secondary core has km+1 slots, k is a positive integer greater than or equal to 2, m is the number of phases, including km ‑One middle slot and two end slots, of which the two end slots are half slots; this structure uses the reluctance thrust to partially replace the permanent magnet thrust, which is beneficial to reduce costs, and the asymmetric magnetic barrier structure is beneficial to reduce the cogging of the motor force to increase the thrust density.