35results about How to "Improve weak magnetic properties" patented technology

The invention relates to the motor technology field and especially relates to a mechanical adjustable magnet type rotation motor. The motor comprises a rotor iron core, a rotating shaft, a movable magnetic yoke and a mechanical solenoid-valve adjustable-magnetic device. A front salient pole and a rear salient pole are embedded into the rotor iron core. The movable magnetic yoke is located between the front salient pole and the rear salient pole. The mechanical solenoid-valve adjustable-magnetic device is connected to the movable magnetic yoke and makes the movable magnetic yoke axially moves along the rotating shaft. The mechanical solenoid-valve adjustable-magnetic device makes the movable magnetic yoke axially moves along the rotating shaft so that on and off of a leakage flux path which is newly added in a permanent magnetic flux are realized. Further an effective magnetic flux of a motor air gap is indirectly controlled so that the motor possesses a good adjustable flux capability and high rotating speed operation is realized. When a traditional permanent magnetism motor carries out flux weakening speed expansion, a large straight shaft is needed to carry out demagnetizing current. By using the rotation motor, the above problem is avoided. The motor is guaranteed to possess high efficiency and a high power factor. Permanent magnet steel has no demagnetization risks so that reliability of the motor is increased.

The invention discloses a multi-working mode dual-stator magnetic field modulation motor, which comprises an inner stator, a rotor, an outer stator, a permanent magnet, a first set of windings, a second set of windings; a first layer of air gaps and a second layer of air gaps They are respectively arranged between the inner stator and the rotor, and between the outer stator and the rotor; several stator teeth are arranged on the circumference of the stator, and the ends of the stator teeth have one or more small slots to form modulating teeth. The tooth end is composed of permanent magnets and modulating poles; the rotor is composed of magnetic conductors and non-magnetic conductors arranged alternately; the inner stator slot is embedded with a centralized first set of windings, and the outer stator slot is embedded with a centralized second set of windings; The purpose of the two sets of windings is determined according to the specific working mode. The multi-working mode dual-stator magnetic field modulation motor of the present invention can be applied in the field of transportation to solve the problem that the working performance of the motor cannot meet the actual needs under multiple working conditions due to complex and changeable road conditions.

The invention relates to a stator surface-mounted doubly salient permanent magnet motor with an auxiliary salient pole which has simple and firm structure, and constant power, wide speed-regulation operation range and higher power density; the motor comprises a stator (1) and a rotor (5), the rotor (5) is arranged at the inner part or outer part of the stator (1), the stator (1) and the rotor (5)are in a doubly salient structure, and a concentrated winding (3), a permanent magnet (2) and an auxiliary salient pole (4) are arranged on the stator (1), wherein, each concentrated winding coil of any one phase of the concentrated winding (3) is arranged in an iron core groove of the stator (1), and the coils of each a phase winding are connected serially or in parallel; the permanent magnet (2) is arranged on the salient pole of the stator (1), the outer surface of each stator tooth, facing to air gap, is mounted with two permanent magnets (2), and the polarity of two magnetic steels, below the same tooth, is the same, and the magnetism of the magnetic steel, below the adjacent stator tooth, is opposite.

The invention discloses a stator permanent magnet type double-rotor magnetic field modulation motor and a design method thereof. The stator permanent magnet type double-rotor magnetic field modulationmotor comprises a stator, an inner rotor and an outer rotor. The stator is arranged between the two rotors. Permanent magnets are embedded in the yoke part of the stator in the radial manner. The magnetizing direction of the permanent magnets is tangential to the circumference, and the N poles and the S poles of the permanent magnets are alternately arranged. The difference between the positionsof the inner rotor and the outer rotor is half of the polar distance of the two rotors, while the rotating directions and the rotating speeds of the two rotors are the same. The armature winding of the motor adopts the concentrated winding mode. According to the invention, two motors with double salient pole structures are combined, and the magnetic chains of the same phase coil are complementary.The single-coil magnetic chain of the motor is unipolar, and the magnetic chain of the synthetic winding is bipolar. The structure of the motor has the magnetic field modulation effect, so that the motor has higher counter electromotive force and torque performance compared with a conventional salient pole structure motor. After the armature is loaded, the generated armature magnetic field does not pass through the permanent magnet. Therefore, the permanent magnet is prevented from demagnetizing due to over-large current. The rotors of the motor are formed by laminating silicon steel sheets with salient pole structures only, so that the good robustness is achieved.

The invention discloses a permanent magnet fault-tolerant motor based on an alternate tooth winding and an unequal stator tooth pitch. The stator has Ns / 3 fault-tolerant teeth and 2Ns / 3 armature teeth. The Ns / 3 fault-tolerant teeth are uniformly distributed along the inner circumference or the outer circumference of the stator. Two armature teeth are uniformly arranged between two adjacent fault-tolerant teeth and comprise an armature tooth 1 and an armature tooth 2. A large tooth slot is formed between the armature tooth 1 and the armature tooth 2. A small tooth slot is formed between each fault-tolerant tooth and the adjacent armature teeth 1 and 2. The volume of the large tooth slot is larger than the volume of the small tooth slot. An armature coil is wound around each armature tooth.The power direction of the armature coil on the armature tooth 1 is opposite to the power direction of the armature coil on the armature tooth 2. For a fractional slot motor with a high winding factorof Ns'=2p'+ / -1, by using a combination of the alternate tooth winding and the unequal stator tooth pitch, phase-to-phase isolation is achieved, thereby improving the fault tolerance of the motor, andincreasing the self-inductance in each phase so as to improve the short-circuit current suppression capability and weak magnetic capability.

The invention provides a vehicle built-in permanent magnet synchronous motor controlling method. The method comprises steps of 1, establishing permanent magnet synchronous motor mathematic models including a voltage equation model, an electromagnetic torque equation model and a torque balance equation model; 2, designing a sliding mode surface and a sliding mode control law, so as to achieve sliding mode control of the electromagnetic torque of a motor; 3, based on the electromagnetic torque value Te, performing decomposition to obtain a quadrature-axis current iq and a direct-axis current id; 4, based on iq, id, Udc, quadrature-direct axis voltage references U'q and U'd, obtaining quadrature-direct axis current reference values i<*>[q] and i<*>[d] by decomposition; 5, decomposing i<*>[q] and i<*>[d] to obtain the quadrature-direct axis voltage references U'q and U'd; and 6, based on the U'q and U'd, obtaining two phase stationary voltages U[alpha] and U[beta] by coordinate conversion, taking the U[alpha] and U[beta] as the input, and obtaining three phase reference voltages Ua, Ub and Uc after modulating the models to drive an inverter and the motor to work. The control method can ensure stable operation of the motor under any working condition.

The invention relates to the technical field of drive motors, and specifically provides a motor field weakening control method, device and motor. A field weakening control method, comprising: obtaining an output value of the q-axis voltage and a set value of the q-axis voltage in a field-weakening state; determining a compensation value of a field-weakening current according to the output value and the set value; The value compensates for the field weakening current. The control method of the present invention improves the field weakening effect of the motor by correcting and compensating the field weakening current on the basis of the existing field weakening method, and further increases the motor speed. performance to meet more demand scenarios.

The invention discloses a Halbach array permanent magnet synchronous motor with high flux weakening property. The Halbach array permanent magnet synchronous motor structurally comprises a stator iron core, a three-phase armature winding, an air gap, a rotor iron core, a sectional Halbach array permanent magnet pole, and the like. The Halbach array permanent magnet synchronous motor has the advantages that the problem of difficulty in flux weakening in the traditional surface-mounted permanent magnet synchronous motor is solved; by additionally arranging a rotor iron core convex pole on a direct axis, the length of the air gap of the direct axis is effectively reduced, the reactance of the direct axis of the armature is increased, the flux weakening effect of the armature current is enhanced, and the irreversible demagnetizing of the permanent magnet in the demagnetizing magnetic field is avoided; the surface-mounted magnetic pole adopts the sectional Halbach array structure, so that the distribution of the air gap magnetic field is improved, the problems of overlarge torque fluctuating and the like due to the rotor convex pole are relieved, and the property of the whole motor is improved.

The invention provides a stator assembly and a hybrid excitation motor. The stator assembly comprises a stator core, a winding ring, a magnetic conduction support and an excitation winding which are coaxially arranged, wherein the winding ring, the magnetic conduction support and the excitation winding are all arranged at one end of the stator core, the magnetic conduction support sleeves the winding ring, the winding ring is made of a non-magnetic conduction material, the magnetic conduction support is made of a magnetic conduction material, a winding space is formed between the winding ringand the magnetic conduction support, and the excitation winding is arranged in the winding space. The hybrid excitation motor comprises the stator assembly. Except the hybrid excitation motor has theadvantages of good speed regulation performance, high demagnetization resistant capability, high material utilization ratio and high efficiency of a traditional hybrid excitation motor, the problem ofmagnetic saturation near to an excitation winding can be effectively reduced by the winding ring and the magnetic conduction support in the stator assembly, and the weak magnetic capability of the motor is improved.

The invention discloses a magnetic steel built-in double-U-shaped fractional slot concentrated winding permanent magnet motor. The motor comprises a stator and a rotor 6; the rotor of the motor comprises a rotor core, inner-layer magnets, outer-layer magnets and magnetic steel slots. And the inner-layer magnets and the outer-layer magnets, forming U-shaped structures, are distributed at the rotorcore part; each group of magnets comprises four magnets, wherein the four magnets include two radial magnets and tangential magnets; a magnetic bridge used for enhancing the mechanical strength of therotor is arranged between two adjacent magnets in each group of magnets; and with the width of the magnetic bridges properly set, the mechanical strength of the rotor of the motor can be ensured, andthe motor does not generate large magnetic flux leakage. Whether the magnetic bridges are located between the magnets or between the magnets and the outer circle of the rotor, the width of the magnetic bridges in the outer-layer magnets is greater than the width of the magnetic bridges in the inner-layer magnets. According to the magnetic steel built-in double-U-shaped fractional slot concentrated winding permanent magnet motor of the invention, the number of the layers of the built-in magnets is increased, and therefore, the reluctance torque of the motor is increased; and the segmented rotor is adopted, the pulsating torque and rotor eddy current loss of the motor are reduced.

The invention discloses an optimal field-weakening control method based on the safety of the elastic electric rudder system, which detects the current speed and load torque of the motor, and obtains the output torque, current limit value, d-axis inductance component and q-axis inductance component at the current speed , define the field weakening index J, give the optimal field weakening control index based on the speed, output torque, and load torque, calculate the J value of the d-axis current component at different values, select the maximum value maxJ of the J value, and convert this value to The corresponding d-axis current component and q-axis current component are used as the control output at the current speed. The invention aims at the characteristics of tactical missiles that do not need to be reused, fast maneuvering, complicated working conditions, and short battery life under the same working conditions, and fully utilizes the weak magnetic speed-up ability of the electric steering gear for missiles under the condition of power surplus, and designs the direct-axis current The optimal allocation strategy and numerical calculation scheme are used to improve the magnetic weakening performance of the elastic electric rudder system.