544 results about "Synchronous reluctance motor" patented technology

A fault tolerant control system for a multi-phase permanent magnet assisted synchronous reluctance motor utilizes vector control to provide safe operation under various phase loss fault conditions. Specifically, the vector control of the present invention utilizes a fault tolerant algorithm that receives a torque input and an electrical current feedback signal from the motor. Thus, in the presence of a fault condition, the vector control applies the optimal torque angle to the motor, while reducing the phase currents to an optimized value to lessen the saturation effect in the motor, so as to ensure that the motor delivers maximum torque output in the presence of such faults. As such, the control system allows the motor to operate safely with high reliability, which is highly desirable, such as in electric vehicles and the aerospace industry.

Disclosed is a method and device for controlling the startup of a synchronous reluctance motor. The device includes: a voltage injector which generates injection voltages to estimate an initial position of the rotor; a motor drive voltage generator which converts stationary-coordinate-system voltages including the injection voltages to three-phase motor drive voltages and applies the three-phase motor drive voltages to the motor; a current extractor which extracts response current components i_α-inj, i_β-inj in respect to the injection voltages from two-phase stationary-coordinate-system currents converted from three-phase currents detected upon rotation of the motor; and a position/speed estimator which extracts response current components related to a rotor position from the response current components i_α-inj, i_β-inj in respect to the injection voltages to calculate a rotor position error (e), and estimates the speed and position {tilde over (ω)},{tilde over (θ)} of the rotor from the calculated rotor position error (e).

A discrete rotor position estimation method for a synchronized reluctance motor is provided. A d.c.-link voltage V_dc and a phase current I_ph are sensed. A flux-linkage λ_ph of an active phase is calculated from the sensed d.c.-link voltage V_dc and the sensed phase current I_ph. The calculated flux-linkage λ_ph is compared with a reference flux-linkage λ_r. The reference flux-linkage λ_r corresponds to a reference angle θ_r which lies between angles corresponding to aligned rotor position and non-aligned rotor position in the synchronized reluctance motor. An estimated rotor position θ_cal is obtained only once when the calculated flux-linkage λ_ph is greater than the reference flux-linkage λ_r.

A rotor of a flux barrier type synchronous reluctance motor comprises: a rotation shaft; a rotor core formed as a plurality of steel plates are laminated to one another, the steel plate having a shaft hole for inserting the rotation shaft, a plurality of flux barrier groups spaced from one another in a circumferential direction and having a plurality of flux barriers spaced from one another in a radial direction, and a coupling hole penetratingly-formed between the adjacent two flux barrier groups; and a coupling member inserted into the coupling hole and fixing the steel plate. Accordingly, a fabrication cost and an entire weight of the motor are decreased, and a fabrication process is facilitated with a shortened fabrication time. Also, a large coupling intensity is obtained and a magnetic saturation does not occur, thereby preventing a function degradation of the motor.

The invention relates to a displacement estimation method of a bearing-free synchronous reluctance motor, comprising the following steps: constructing a band-pass filter BPF: sending coordinate- transformed suspension winding three-phase detection current into the band-pass filter BPF; extracting suspension winding high frequency induction current ix_i and iy_i through the BPF; then constructing a multiplication demodulator: taking the ix_i and iy_i as a first input signal of the multiplication demodulator; constructing a phase shifter, taking pulsation high-frequency voltage signal ud_i having gone through phase shift as a second input signal of the multiplication demodulator; obtaining I' and I signal after demodulation computation is carried out on the two input signals by the multiplication demodulator; then filtering high-frequency component of the I' and I' signal by a low-pass filter LPF, finally obtaining current components comprising rator radial displacement; afterwards multiplying corresponding scale factor to obtain estimated value of the radial displacement of a controller electric machine rator. With the method and the device for controlling the displacement-free sensor, the displacement sensor is not needed and a DSP is adopted to control an electrical machine with the assistance of a software.

The invention relates to a support vector machine inverse system composite controller based on a bearingless synchronous reluctance motor. Two expandable current hysteresis loop PWM (Pulse-Width Modulation) inverters and a bearingless synchronous reluctance motor to be controlled are used as a whole to form a composite object to be controlled; a support vector machine inverse system controller is constructed according to a mathematical model of the object to be controlled and is connected in series before the composite object to be controlled of the bearingless synchronous reluctance motor so as to realize the decoupling control between the electromagnetic torque and the radial levitation force of the motor as well as the radial levitation force in two vertical directions; on the basis, a rotating speed closed loop linear controller and two rotor position closed loop linear controllers are respectively designed for the rotating speed of the motor and the rotor positions to form a linear closed loop controller; an finally the linear closed loop controller, the support vector machine inverse system controller and two expandable current hysteresis loop PWM inverters commonly form the support vector machine inverse system composite controller for dynamically decoupling control on the bearingless synchronous reluctance motor. The control speed, the control precision and the dynamic and static performances of the system can pass parameters for adjusting the linear closed loop controller.

The invention discloses a 2-magnetic-pole controller-free self-starting permanent magnet auxiliary synchronous reluctance motor, and relates to the field of the synchronous reluctance motor. At current, the reluctance motor can be only in operation by being equipped with a special controller, and needs a large number of rare earth permanent magnet material, so that the cost is high. The 2-magnetic-pole controller-free self-starting permanent magnet auxiliary synchronous reluctance motor comprises a machine base, a front end cover, a back end cover, a front bearing, a front bearing inner cover,a back bearing, a back bearing inner cover, a line stator, a rotor iron core, a rotary shaft, a bottom foot, a fan blade and a fan cover; the rotor iron core is formed by multiple iron core stampingsheets with two magnetic poles in an overlaying manner; rotary shaft holes are formed in the centers of the iron core stamping sheets; the two magnetic poles both comprise radially arranged reluctancegrooves of the same number; a fan-shaped permanent magnet is arranged in the middle of each reluctance groove; and an aluminum cast mouse cage is arranged on the periphery, on the outer sides of thereluctance grooves of the iron core stamping sheets, of the rotor iron core. By virtue of a combination of a permanent magnet synchronous motor and the synchronous reluctance motor in the technical scheme, and by combination of the aluminum cast mouse cage, use of a permanent magnet material is reduced, and high operation also can be realized without a controller, so that the motor cost is obviously lowered.

A control apparatus of a synchronous reluctance motor includes a torque current correction unit (16) that generates a torque current command tracing a load torque so as to make the output torque of the motor coincide with the load torque. the control apparatus may further include a position and speed estimation unit (13) that estimates the position and speed based on three phase voltage equation to improve control performance in a voltage saturation state.

The invention provides a permanent magnet auxiliary synchronous reluctance motor and a mounting method thereof. The permanent magnet auxiliary synchronous reluctance motor comprises a stator and a rotor, wherein the stator comprises a stator iron core and a concentrated winding, and the stator iron core comprises a plurality of convex magnetic poles; the convex magnetic poles comprise magnetic pole teeth and tooth boots, and the widths of the tooth boots are larger than the widths Lc of the magnetic pole teeth; the rotor comprises a rotor iron core and a plurality of permanent magnet groups, and a plurality of permanent magnet slot groups are uniformly distributed on the rotor iron cores; each permanent magnet slot group comprises at least two layers of permanent magnet slots, and each permanent magnet group comprises a permanent magnet arranged in a corresponding permanent magnet slot; the permanent magnets in each permanent magnet slot group have the same polarity, and the polarities of two adjacent permanent magnet groups are opposite; and a relation between a minimum interlayer distance g between two adjacent layers of permanent magnets in each permanent magnet group and the widths T of the tooth boots is disclosed in the specification. According to the permanent magnet auxiliary synchronous reluctance motor, the reluctance torque is maximally utilized, so that the efficiency of the motor reaches a higher level.

A method and an arrangement of determining inductances of a synchronous reluctance machine are provided. The method includes supplying a voltage pulse in the quadrature-axis or direct-axis direction of rotor, sampling currents generated by the supplied voltage pulse, and calculating values of flux at the sampling instants from the value of the supplied voltage pulse, the sampled current values and a value of the stator resistance. The method also includes calculating synchronous inductance of the machine by dividing the calculated flux values by the corresponding sampled currents, and/or calculating transient inductance of the machine as a derivative of the flux with respect to current, and storing the calculated values as a function of current.

The method discloses a bearingless synchronous reluctance motor torque and suspension force direct controller and a construction method thereof. The bearingless synchronous reluctance motor torque and suspension force direct controller consists of a direct torque controller with a rotating speed and torque double closed loop and a suspension force direct controller with a rotor displacement and suspension force double closed loop, wherein the direct torque controller consists of two proportional plus integral (PI) controllers, a torque winding flux linkage and a torque observer, a reference flux linkage generating module and a space vector pulse width modulation module; and the suspension force direct controller consists of two proportional plus integral plus derivative (PID) controllers, a torque winding flux linkage and torque observer, a suspension force winding flux linkage observer, a suspension force estimation module, a force/ flux linkage conversion module and a space vector pulse width modulation module. By the controller and the construction method, motor torque and radial suspension force are independently controlled, stable suspension and operation of a motor rotor are ensured and high motor operating performance is achieved.

The invention provides a permanent magnet auxiliary synchronized reluctance motor rotor, a motor thereof and an installation method of the motor. The permanent magnet auxiliary synchronized reluctance motor rotor comprises a rotor iron core and a plurality of permanent magnet groups, a plurality of permanent magnet groove groups are uniformly distributed on the rotor iron core with rotor axis serving as a circle centre in a peripheral direction, each permanent magnet groove group comprises a single layer or multilayer of permanent magnet grooves, the number of the permanent magnet groups is identical to that of the permanent magnet groove groups, each permanent magnet group comprises a single layer or multilayer of permanent magnets which are respectively embedded into the permanent magnet grooves of the corresponding permanent magnet groove groups, the permanent magnets in each permanent magnet group have the same polarity, the polarities of the two adjacent permanent magnet groups are opposite, the end portion of at least one layer of permanent magnet groove in the plurality of permanent magnet groove groups is a sharpened end provided with a cutting face, and width T of the sharpened end cutting face of a permanent magnet groove with the sharpened end and middle width W meet the following relation. By means of the motor rotor, the motor thereof and the installation method of the motor, the whole demagnetization resistant capacity and operation reliability of the motor are improved.

The present invention discloses a permanent magnet assisted synchronous reluctance motor rotor which can be used in a high-speed situation. The permanent magnet assisted synchronous reluctance motor rotor comprises a rotor core, magnetic barriers distributed on the rotor core and magnetic steels arranged in the magnetic barriers. Four layers of ship-shaped magnetic barriers are distributed under each pole of the rotor core, and each layer of magnetic barriers is formed by the connection closing of a straight line part which is in the middle and is perpendicular to a d axis direction and oblique straight line parts which are at two ends and are in an alpha angle direction with the d axis. According to the permanent magnet assisted synchronous reluctance motor rotor, the optimal design of the motor rotor is carried out, and thus a motor has the advantages of high efficiency, high torque density, high power factor, strong anti-demagnetization ability and convenient manufacture.

The invention discloses a bearing-free synchronous reluctance motor rotor displacement soft measurement method, which comprises the following steps of: first establishing a back electromotive force model of a suspension winding of a motor, namely, performing coordinate transformation on three-phase detection current and voltage of the suspension winding, transmitting the transformed detection current and voltage into the back electromotive force model to generate back electromotive forces ealpha2 and ebeta2 of a stator; then constructing an expanded flux linkage observer of the suspension winding, namely, acquiring flux linkage observed values Psix and Psiy by taking the back electromotive forces as input signals of the expanded flux linkage observer; and finally constructing an expanded displacement observer, namely, performing the coordinate transformation on the three-phase detection current of a torque winding and the suspension winding by taking the flux linkage observed values Psix and Psiy as a first input signal of the expanded displacement observer, and finally acquiring the rotor displacement observed values alpha and beta under biphase stationary coordinates by taking the transformed detection current as second and third input signals of the expanded displacement observer. A bearing-free synchronous reluctance motor suspension system constructed by the method saves a displacement sensor, can realize a rotor displacement soft measurement technology and the high-speed and stable suspension running of a controlled motor, and has the advantages of simple structure, easily realized algorithm, quick dynamic response and the like.

The invention relates to a scroll compressor. When a freezing medium containing hydroflurocarbon (HFC) is used, fatty acid ester oil is used for smoothing. When a freezing medium containing hydrogen chlorofluorocarbon (HCFC) is used, fatty acid mineral oil is used for smoothing. A driving motor is a synchronous reluctance motor which is provided with a rotor comprising a plurality of flat laminated sheets. Each flat laminated sheet is provided with a plurality of magnetic flux barriers extending in directions of a circumference and a radius. An insulation film formed from a crystal plastic film is inserted between a winding and a motor stator, and the winding is formed from metal lines having an enamel coating. The characteristics cause the distortion of the driving motor to be reduced. In addition, the invention reduces wastage caused by the slippage of the driving motor, and reduces the heat wastage caused by the heat generation of the rotor.

The invention discloses a method and a device for inversely controlling the fuzzy compensation of the radial position of a bearing-free synchronous reluctance motor, which is suitable for the suspension operation control of the bearing-free synchronous reluctance motor. The control method comprises: forming a composite controlled object by using an expanded hysteresis loop PWM inverter and the radial position of a controlled motor; reconstructing an inverse system of the composite controlled object; connecting the inverse system before the composite controlled object in series to compound a pseudo linear system consisting of two radial position subsystems; and designing a closed-loop fuzzy compensator for the pseudo linear system to perform decoupling control of the radial position of the controlled motor. The control device comprises the inverse system, the closed-loop fuzzy compensator and the expanded hysteresis loop PWM inverter. The method and the device are used for building a novel decoupling control device of the bearing-free synchronous reluctance motor to realize the high-performance suspension control of the motor and are widely used in alternating current power transmission and servo systems using the bearing-free synchronous reluctance motor as a power device, have a simple control system algorithm, have the advantage of high load disturbance resistance and have high dynamic and static adjustment performance.

In a synchronous reluctance motor having a rotor having a plurality of pairs of an outer side slot formed at an outer periphery side and an inner side slot formed at inner side of the rotor. The distance between the outer periphery of the rotor and the outer side slot is determined to be the width of the stator magnetic pole portion of the stator multiplied by 0.7 to 1.3. A first total magnetic flux amount of an outer side permanent magnet disposed in the outer side slot is determined to be larger than or equal to a second total magnetic flux amount of an inner side permanent magnet disposed in the inner side slot.

A motor rotor assembly that includes multiple motor rotor sections and a rotor bar that extends through the motor rotor sections, such that the rotor bar and the motor rotor sections are configured such that the rotor sections are step-skewed, or continuously skewed, from each other. The assembly may be used in an IPM or Synchronous Reluctance motor; and, the motor rotor sections may be of solid core or laminations. Various assembly components, IPM and Synchronous Reluctance motors, and methods of construction/assembly are also disclosed. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.

The invention provides a permanent magnet auxiliary synchronized reluctance motor rotor, a manufacturing method thereof and a motor with the motor rotor. The permanent magnet auxiliary synchronized reluctance motor rotor comprises a rotor iron core and permanent magnets, a plurality of groups of magnetic pole units are arranged in the rotor iron core, the permanent magnets are arranged in the magnetic pole units, each group of magnetic pole units comprises multilayer permanent magnet grooves which are distributed in a radial direction and used for accommodating the permanent magnets, magnetizers are arranged among the multilayer permanent magnet grooves, and materials of the magnetizers are different from those of the rotor iron core. The motor rotor, the manufacturing method thereof and the motor with the motor rotor have the advantages that a soft magnetic material and a press powder material are combined, the iron core can be configured according to different requirements, the machining difficulty is reduced, and the whole efficiency of the permanent magnet auxiliary synchronized reluctance motor is improved.

A rotor of a synchronous reluctance motor, comprising: a laminated core formed by laminating a plurality of silicon steel sheets, and having a barrier formed at each of regions equally divided on the basis of the center of each silicon steel sheet and a guide pin hole formed between the barriers; end plates fixed to both side of the laminated core; a guide pin inserted into each of the guide pin holes; and a rivet installed by penetrating a hole of each barrier in order to couple the laminated core and the end plates with each other.