343 results about "Neutral line" patented technology

A multi-phase LLC resonant converter circuit (10) includes: first to third LLC resonant converters each including a series circuit (S1 to S3) of a first switch and a second switch that are connected in parallel to a DC power supply, a high-frequency transformer (T1 to T3) including a primary-side winding and a secondary-side winding, a resonant circuit including a resonant reactor (Lr1 to Lr3) connected between a connection point of the first switch and the second switch and one end of the primary-side winding, a resonant capacitor (Cr1 to Cr3) in which one end is connected to the other end of the primary-side winding, and a divided resonant capacitor (Cn1 to Cn3) in which one end is connected to a connection point of the primary-side winding and the resonant capacitor; a first neutral line (N1) that connects the other end of the resonant capacitor; a neutral line reactor (Ln) connected between the first neutral line and a power supply line of the DC power supply; and a second neutral line (N2) that connects the other end of the divided resonant capacitor.

The invention belongs to the technical field of power electronics of power supply or power distribution, and provides a control method of a three-phase four-wire inverter, a controller and an inversion control system. A first control component is generated by using a phase angle, an inversion side three-phase current sampling value and a proportional integral compensator; a second control component and a third control component are generated by using a power grid voltage angular frequency, a neutral line current sampling value, a repetitive controller and a proportional resonance controller, the three control components are combined to control an inverter power switch tube, a proportional integral compensator is still adopted, the algorithm is simple, parameters are easy to design, and the reliability is high. And meanwhile, a repetitive-proportional resonance (RC-PR) composite controller is utilized to realize suppression of neutral line fundamental wave and harmonic current, and the method has faster dynamic response to load abrupt change, so that optimization of dynamic performance and steady-state performance is realized.

The invention discloses an electricity stealing behavior detection method and system based on an intelligent electric energy meter, and the method comprises the following steps: constructing a phase locking reference frame at the end of the intelligent electric energy meter, synchronously collecting a voltage phase and a current phase through high-precision time, generating a direction discrimination baseline, setting a zero-power crossing point and a direction overturning threshold value, and carrying out the detection of an electricity stealing behavior. Outputting a direction baseline consistency index as a direction identification reference; according to the invention, through phase locking, high-precision synchronization, neutral line drift analysis, multi-table data alignment and phase disturbance verification, accurate identification and causal confirmation of a current backward flow behavior are realized, a disturbance user is reversely positioned in combination with a disturbance fingerprint, an intervention instruction is output, and an identification-verification-positioning-control closed loop mechanism is constructed. And the anti-electricity-stealing capability and the metering accuracy of the intelligent electric energy meter in a complex power supply environment are obviously improved.

The invention discloses a power supply circuit and electrical equipment. The power supply circuit comprises a three-phase power supply and three rectification and inversion modules, wherein each rectification and inversion module comprises a first input end, a second input end and an output end; the first input ends of the three rectification inversion modules are respectively connected to three phase lines in a three-phase power supply in a one-to-one correspondence manner; second input ends of the three rectification inversion modules are connected to a neutral line in the three-phase power supply; the output ends of the three rectification inversion modules are respectively connected to three loads in a one-to-one correspondence manner; and the rectifying and inverting module is used for sequentially rectifying and inverting the input voltage and then supplying power to corresponding loads. According to the invention, the three-phase power supply is divided into three independent single-phase power supply paths for three loads, single-phase rectification is carried out on each phase independently, the voltage level is reduced, a low-voltage-level device can be selected, and the cost is reduced; the three-phase load is balanced, the harmonic dispersion is realized, and the harmonic pollution is reduced; fault area isolation is realized, and maintenance difficulty and maintenance cost are reduced.

The invention discloses a waveform classification optimization method and system for hidden danger early warning of a power secondary circuit. The method comprises the following steps: obtaining three-phase current recording file window data; classifying and labeling the three-phase current recording file window data based on a preset numerical value judgment principle to obtain labeled target three-phase current recording file window data; converting window data of the target three-phase current recording file into two-dimensional images through a GASF (Geometric Amplitude Shift Function) and a GASF (Geometric Amplitude Shift Function), and combining the two-dimensional images into at least one image unit; inputting the at least one image unit into a preset VGG16 convolutional neural network for iterative training to obtain a current secondary circuit neutral line fault diagnosis model; and inputting the real-time fault recording time sequence data into the current secondary circuit neutral line fault diagnosis model, and outputting to obtain a waveform classification result at a three-phase current circuit neutral line. The problem that efficient and accurate online detection and judgment are difficult to realize at present when the neutral line of the current secondary circuit is virtually connected or broken is solved.

The invention provides an inverter and a grid-connected and off-grid switching device and method thereof, and the device comprises a grid-connected switch which is disposed between an AC side grid-connected port of the inverter and a power grid; the off-grid switch is arranged between the alternating current side off-grid port of the inverter and the load; the grounding switch is configured to be used for controlling connection and disconnection between a neutral line of the inverter and a protective ground line; the control module is configured to control the grid-connected switch and the off-grid switch to be switched on and control the grounding switch to be switched off when the inverter is in a grid-connected state; and when the inverter is in the off-grid state, the grid-connected switch is controlled to be switched off, and the off-grid switch and the grounding switch are controlled to be switched on. The device ensures that the grounding switch and the grid-connected switch are not in a conducting state at the same time, and the safety of the inverter is ensured.

One aspect of the invention relates to a bidirectional on-board charger 2 for a vehicle 1, comprising:a bidirectional AC-to-DC converter 8 designed to supply power to an electrical power supply socket 6 for an external electrical device;means for detecting an electrical insulation fault 9, connected to a phase line 12 and to a neutral line 13 of said electrical power supply socket 6; a switch 16 arranged on said phase line 12; a switching means 18 designed to control the switch 16 between a first position P1 in which the means 9 are connected to the socket 6 and a second position P2; a resistor 20 which, when the switch 16 is in the second position P2, is electrically connected to the switch 16 and to a ground 10 of the vehicle.

The invention relates to the field of three-level inversion twin-trawling systems, and particularly discloses a harmonic current suppression method, system and product of a three-phase three-level inversion twin-trawling system, and the method specifically comprises the following steps: S1, a bus voltage balance control step; s101, acquiring a bus voltage error value; s102, acquiring a bus voltage error correction value; s2, a neutral current harmonic suppression step; s201, acquiring a common-mode current flowing through a node connected with the power side and the load side; s202, acquiring a higher harmonic component in the common-mode current; s203, obtaining a higher harmonic component suppression correction value; and S3, superposing the corrected value and a three-phase voltage output modulation wave to obtain a three-phase inverter circuit modulation signal of a power side in the three-phase three-level inverter twin trawling system. The harmonic suppression algorithm of the output current can be provided based on the single-power three-phase dragging system, the cost can be reduced, and the current distortion can be reduced, so that the real current output condition can be simulated.

The invention relates to the technical field of energy storage converters, in particular to a three-level inverter DPWM and SVPWM smooth switching method and system, a medium and equipment, and the method comprises the steps: determining a current modulation mode which comprises the SVPWM and the DPWM; a first modulation coefficient and a second modulation coefficient are set, the first modulation coefficient corresponds to the weight of the SVPWM common-mode voltage, the second modulation coefficient corresponds to the weight of the DPWM common-mode voltage, and the sum of the first modulation coefficient and the second modulation coefficient is constantly 1; determining values of a first modulation coefficient and a second modulation coefficient based on the current modulation mode in response to a switching instruction of switching from the current modulation mode to a target modulation mode; and combining the three-phase SPWM modulation wave, the first modulation coefficient, the SVPWM common-mode voltage, the second modulation coefficient and the DPWM common-mode voltage to generate a total modulation wave. According to the invention, non-stop switching of SVPWM and DPWM is realized, fast and stable neutral-point voltage and smooth transition of neutral-line current and three-phase current are ensured when two modulation modes are switched, and the smooth transition requirement of mode switching is met.

The invention relates to the technical field of power systems, and discloses a null line disconnection detection method and device, and the method comprises the steps: calculating a three-phase voltage unbalance degree according to a negative sequence voltage and a zero sequence voltage; judging whether the three-phase voltage unbalance degree exceeds a first preset threshold value or not; if the three-phase voltage unbalance degree exceeds the first preset threshold value, whether the difference value between the third harmonic content and the second harmonic content in the three-phase voltage exceeds a second preset threshold value or not continues to be judged; and if the difference value between the third harmonic content and the second harmonic content exceeds a second preset threshold value, determining that the zero line is disconnected. As the null line is disconnected, the third harmonic is obviously increased, and the second harmonic is slightly changed, the neutral line fault and other disturbances can be effectively distinguished through the difference between the third harmonic and the second harmonic. The zero-sequence component and the negative-sequence component are coupled, the three-phase voltage unbalance degree is calculated, the unbalance state of a three-phase system is represented more comprehensively and accurately, and the harmonic characteristic difference of each split-phase voltage is combined and can be effectively applied to neutral line fault detection.

The invention provides a switch combination detection method of an optical storage system and the optical storage system, the optical storage system is electrically connected with a power grid, the optical storage system comprises a photovoltaic management unit, an energy storage management unit and an inverter, the inverter comprises an inverter circuit, a controller and a switch combination, the switch combination comprises a plurality of groups of switch devices, each group of switching devices comprises two switching devices which are connected in series, the inverter circuit comprises at least one phase line and a neutral line, and a group of switching devices is arranged in each of the at least one phase line and the neutral line. The control signal is used for controlling switching devices in the switch combination to be switched on or switched off; after the switch combination responds to the control signal to complete switching-on or switching-off of the switching device, voltage of the input end and the output end of the switch combination is obtained; and judging whether the voltages of the input end and the output end of the switch combination meet a preset voltage condition, and judging whether the switch combination has a fault according to a judgment result.

A system and a method for locating faults in an electric grid. The system includes a network management module to receive information about physical topology of the electric grid and define a network topology as a block grid with known dimensions based thereon. Two or more traveling wave fault recording units installed at predefined locations in the block grid are employed to detect and record the arrival time of traveling waves generated by a fault, which traverse through neutral wires, ground wires, or cables. The system includes a processing module to determine fault location based on the recorded arrival times from the traveling wave fault recording units and their predefined location coordinates in the block grid, using arithmetic and / or heuristic techniques.

A grid-connected distribution box is provided, comprising: a housing having an internal space; a first terminal block module disposed in the internal space and having a control board and a secondary input terminal, the control board being configured to control power distribution and the secondary input terminal being connected to at least one secondary power source; and a second terminal block module disposed to partially overlap the first terminal block module and having a neutral terminal connected to a neutral line.

A ground fault circuit interrupter (GFCI) device includes a ground fault detection module for detecting a ground fault in a neutral line of a plurality of current carrying lines and generating a ground fault signal in response thereto, including a neutral line detection coil having a magnetic core made of a silicon steel and through which the current carrying lines pass; a leakage current detection module for detecting the ground fault signal and detecting a leakage current signal on the current carrying lines, and generating a zero sequence current fault signal in response to either signal; and a drive module for receiving the zero sequence current fault signal and driving a switch module to disconnect the electrical connection of the current carrying lines in response thereto. The GFCI device can avoid false tripping when high frequency currents flow through the current carrying lines, improving user experience and enhancing safety.

The utility model relates to a three-phase four-wire electric energy metering combined junction box, which comprises a base, a detachable anti-theft cover arranged on the base, a bottom plate sealed at the bottom of the base, and a neutral line connecting group, at least three current connecting groups and at least four fuse connecting groups arranged at the bottom of the base and arranged between the base and the bottom plate, the neutral line connecting group is located at the top end of one side of the bottom of the base, and the fuse connecting groups and the current connecting groups are alternately arranged at adjacent positions of one side of the neutral line connecting group and extend to the top end of the other side of the base. According to the utility model, the key components such as the neutral line connecting group, the current connecting group and the fuse connecting group are integrated between the base and the bottom plate, so that the compactness of the structure is realized, the design of the detachable anti-theft cover effectively prevents unauthorized access and tampering, and the safety of equipment is enhanced; the anti-theft cover made of a transparent material enables a user to visually observe the internal state of the junction box, thereby facilitating daily maintenance and troubleshooting.

The invention provides a circuit and an EMI filter. Exemplary embodiments of a circuit for integrating and / or combining an electromagnetic interference (EMI) filter with a power line without using a capacitor are disclosed. In an exemplary embodiment, a circuit includes a common mode inductor including a first inductor and a second inductor. The first inductor is configured to be operable to provide a first impedance along a live line of the circuit. The second inductor is configured to be operable to provide a second impedance along a neutral line of the circuit. The circuit also includes a third inductor configured to be operable to provide a third impedance along a ground of the circuit.

The utility model discloses a direct current motor neutral line detection device, which relates to the technical field of direct current motor maintenance and comprises a bottom shell, a display is mounted at the bottom end of the inner side of the bottom shell, a direct current power supply detection module is mounted at the bottom end of the inner side of the bottom shell, and a time control circuit detection module is mounted at the bottom end of the inner side of the bottom shell. With the adoption of the structure, the direct-current power supply detection module, the time control circuit detection module, the display and the voltage detection module are matched with one another to carry out relative detection, when the motor is in a static state, instantaneous direct-current voltage is applied to an excitation loop, and the excitation loop is excited by utilizing the induced electromotive force direction. The electric brush is converted into direct-current positive and negative voltage through the electronic technology, the direct-current positive and negative voltage is displayed on the liquid crystal screen through the displayer, and if the electric brush is located on the neutral line, the voltage value is zero volt, and if the electric brush is not located on the neutral line, the position of the brush carrier is adjusted till the voltage value is zero volt.

A method, electronic device, and readable storage medium for rapid optimization of neutral bus arrester parameters are disclosed. Based on the main circuit topology of a symmetrical bipolar flexible DC system composed of a half-bridge submodule MMC converter, the method establishes equivalent circuits for different fault conditions, including DC pole-to-ground faults, single-phase-to-ground faults in the valve-side windings connected to the transformer delta connection, and neutral line open-circuit faults. It obtains the energy absorbed by the neutral bus arrester and, based on the relationship between the energy absorbed by the neutral bus arrester and its protection level, optimizes the energy absorption of the arrester under different fault conditions with the goal of balancing the energy absorbed. This allows for rapid optimization of the neutral bus arrester parameters, offering advantages of speed, economy, and efficiency.

This invention provides a fault early warning method for low-voltage power distribution systems in smart factories, belonging to the field of low-voltage power distribution fault early warning technology. Based on the low-voltage power distribution system topology, it deploys synchronous current and voltage acquisition terminals and ambient temperature sensors to acquire real-time current waveforms, voltage sag events, neutral current values, and ambient temperature for each circuit. The real-time current waveforms are decomposed into harmonic sequences using Fourier transform, generating a harmonic spectrum distribution matrix. A joint probability table of voltage sag and neutral overcurrent events is constructed by correlating timestamps. Combining the harmonic amplitude growth trend with the characteristics of coupled events whose joint occurrence probability exceeds a set threshold, a candidate circuit set for insulation degradation risk is screened, and temperature field inversion calculation is performed to generate a conductor surface temperature rise distribution map. This method can quantify the temporal coupling relationship between the two types of events, narrowing the fault investigation scope, reducing false alarms and missed detections, accurately reflecting the insulation degradation state of the circuits, and achieving accurate fault early warning for low-voltage power distribution systems.

The invention discloses a station AC system residual current monitoring method and system, and the method comprises the steps that a cloud server receives current signals transmitted by a monitoring field mobile terminal, and the current signals comprise current signals of three phase lines and a neutral line; correcting the current signal based on the deviation variation trend of the historical measurement result of the residual current sensing equipment; performing vector synthesis based on the corrected current signals of the four lines to obtain a residual current signal; and extracting a feature vector based on the current residual current signal, and analyzing whether a fault occurs and the type of the fault based on the feature vector. According to the invention, the mobile terminal and the cloud end are combined to realize residual current monitoring, the accuracy and efficiency of residual current monitoring analysis are improved, and the cloud end is utilized to analyze the fault of the residual current signal to realize the monitoring of the electrical safety of the line.

The present application provides a neutral wire joining method that can suppress damage or deformation of a neutral busbar even when the neutral busbar is gripped by multiple gripping devices. The present application provides a neutral wire joining method that joins a first U-phase neutral wire, a first V-phase neutral wire, and a first W-phase neutral wire to a neutral busbar by welding in a state where the first U-phase neutral wire and the neutral busbar are gripped by a first gripping device, the first V-phase neutral wire and the neutral busbar are gripped by a second gripping device, and the first W-phase neutral wire and the neutral busbar are gripped by a third gripping device, the neutral wire joining method including a step of providing a predetermined gap between a reference jig branch portion and a support jig and a neutral busbar to position the neutral busbar.

To reduce the complexity of a stator winding having a transposed parallel part.SOLUTION: A stator 100 includes a stator core and a stator winding 120. The stator winding 120 includes, for each phase, a phase conductor 121 composed of a coil segment 130 having a linear part 131 and a bridge part housed in two stator slots 111 using a rectangular conductor, and a segment connection part 128 connecting them in series, and reaching from a lead wire connection part 141 to a neutral dotted line connection part 142. The phase conductor 121 has a parallel portion 123 and a non-parallel portion 122. The non-parallel portion 122 is laid M times (M is an integer of 2 or more) over the entire circumference in the circumferential direction in every two layers from the outer side in the radial direction, and the parallel portion 123 is laid less than M times.SELECTED DRAWING: Figure 4

The application discloses a kind of station with alternating current system residual current monitoring method and system, the method includes: cloud server receives the current signal sent by monitoring field mobile terminal, the current signal includes the current signal of three phase lines and one neutral line;Based on the deviation change trend of historical measurement results of residual current sensing device, correct current signal;Based on the current signal of four lines after correction, vector synthesis is carried out, and residual current signal is obtained;Based on current residual current signal, extract feature vector, based on feature vector analysis whether fault occurs and the fault type that occurs.The application uses mobile terminal and cloud to jointly realize residual current monitoring, improve the accuracy and efficiency of residual current monitoring analysis, uses the fault analysis of residual current signal by cloud, realizes the monitoring of line electrical safety.

A stator for a rotating electrical machine includes: a stator coil in which four or more sets of coil portions for each phase are connected as a parallel circuit between a neutral line terminal and a power line terminal for each phase; and a stator core that has a plurality of slots and around which the stator coil is wound. Stator coil includes slot insertion portions each inserted in corresponding slot, and a crossover portion exposed from an axial end face of stator core and extending in a circumferential direction so as to connect a pair of slot insertion portions. In each phase, a plurality of slot insertion portions in each set includes a first slot insertion portion directly connected to the power line terminal. First slot insertion portion for each phase is located on radially outermost side in corresponding slot on one side in axial direction of stator core.

The application discloses a method for anti-electricity stealing based on abnormal connection of user single-phase electric meter, and relates to the technical field of electric power metering, which comprises the following steps: installing sampling units on the incoming line side and the outgoing line side of the user single-phase electric meter, synchronously collecting single-phase voltage, current, neutral line current and temperature and humidity signals of the meter box, and generating synchronous electrical data sequences through standardization and time stamp alignment. Single-phase voltage and current fundamental phase angles are calculated based on voltage and current instantaneous value sequences, and a phase angle difference map is constructed. The effective value of the neutral line current is calculated, and an abnormal flag sequence is generated in combination with a normal load reference range. The environmental temperature and humidity abnormal fluctuation period is extracted. The above-processed features are input into a connection mode recognition model to identify suspected electricity stealing connection mode categories, improve the accuracy of meter connection abnormality recognition, and reduce misjudgment. The method can effectively identify meter connection abnormalities and improve the accuracy of electricity stealing identification.

There is provided an assembly for use in electrical power transmission. The assembly includes a building for housing an electrical power transmission component, a charging circuit, a grounding circuit for electrical connection to ground, and at least one transformer located outside the building. The or each transformer including mutually coupled first and second transformer windings, the or each first transformer winding for electrical connection to an AC network, the or each second transformer winding for electrical connection to the electrical power transmission component, the or each transformer further including phase and neutral bushings electrically connected to respective terminals of the corresponding second transformer winding, the or each phase bushing extending into the building for electrical connection to the electrical power transmission component, the charging circuit electrically interconnecting the or each neutral bushing and the grounding circuit.

This application relates to the field of chip technology, providing a power measurement chip for low-voltage distribution networks. The chip includes: an analog sampling module, a sampling distribution module, a power measurement module, and a control module. The analog sampling module includes multiple analog-to-digital converters for acquiring three-phase AC voltage analog signals, three-phase AC current analog signals, and neutral line AC current analog signals, respectively, and outputting digital sampling signal groups. The sampling distribution module samples the digital sampling signal groups output by the analog sampling module, outputting multiple signal groups with different update rates, wherein the sampling rate of the first signal group is synchronized with the AC voltage frequency of the power grid. The power measurement module includes a power quality module, which calculates power quality data based on the first signal group output by the sampling distribution module. This chip can achieve sampling rate synchronization with the AC voltage frequency of the power grid, accurately calculate various power quality data, and is suitable for low-voltage distribution networks.

The invention discloses a low-voltage power supply cable fault detection method and system. The method comprises the steps of obtaining cable fault data; preprocessing the cable fault data; the pre-processed data are input to a cable fault detection model for classification diagnosis of low-voltage cable faults so as to obtain a detection result, and the cable fault detection model is used for injecting characteristic frequency signals into a low-voltage power supply cable neutral line and collecting multi-source cable fault data through a coupling mutual inductor; performing deep feature extraction and weighted fusion on the preprocessed signal by using a multi-channel one-dimensional convolutional neural network in combination with an attention mechanism, and realizing fault type identification through a full-connection network; and outputting a detection result. According to the method, cable fault diagnosis is carried out by adopting the deep learning model, so that the accuracy of fault identification is improved, and excellent performance is shown in the aspects of processing complexity and nonlinear problems.

Wave gear (1) with a ring-shaped, fixed, internally toothed gear (2), a flexible, externally toothed gear (3) arranged inside the internally toothed gear (2), and a wave generator (4) which is inserted into the externally toothed gear (3), wherein the flexible, externally toothed gear (3) has a flexible, cylindrical body region (301) and an annular membrane (302) extending radially from a rear end (301a) of the cylindrical body region (301), and wherein a toothed region formed in a region of the cylindrical body region (301) near an open region at the front end (301b) is deformed into an elliptical shape by the wave generator (4) over a region extending from a rear end region near the diaphragm (302) to a front end region near the opening, such that the deformation is substantially proportional to the distance from the diaphragm (302), wherein the wave gear (1) has a compound tooth profile which is engaged during positive deformation, wherein: the fixed, internally toothed gear (2) is designed as a spur gear with a module (m); the flexible, externally toothed gear (3) is designed as a spur gear with a module (m); a number of teeth of the flexible, externally toothed gear (3) is smaller by the size 2n, where n is a positive integer, than the number of teeth of the fixed, internally toothed gear (2); the deformation of a principal axis of an elliptical boundary neutral line of the flexible, externally toothed gear (3) in a cross-section which is perpendicular to an axis and is hereinafter referred to as the principal cross-sectional area, and which is selected at a predetermined position of the toothing of the flexible, externally toothed gear (3) in a tooth path direction, is set to 2κmn (κ>1); the engagement of the teeth of the fixed, internally toothed gear (2) and the flexible, externally toothed gear (3) in the main cross-sectional area is approximated by rack engagement in order to calculate a motion position curve (M) of the teeth of the flexible, externally toothed gear (3) in relation to the teeth of the fixed, internally toothed gear (2) in connection with a rotation of the shaft generator (4); characterized by the fact that a curve region (AB) is obtained from a region of the motion position curve (M) extending from the main axis of the deepest engagement position of the two gears (2, 3) to a side where the engagement of the teeth is disengaged, such that the curve region (AB) begins at position (A) of the deepest engagement of the two gears (2, 3), which is the position where the inclination angle is 90°, and reaches a position (B) where the inclination angle of the motion position curve (M) relative to a radial line of the fixed, internally toothed gear (2) is α° (0°<α°<30°); and a main area of ​​the tooth profile (30) of the flexible, externally toothed gear (3) is defined by a first similarity transformation curve (AC) in which the curve area (AB) is enlarged by a multiple of λ, and by a straight line (33) smoothly connected to an endpoint of the first similarity transformation curve (AC); a main region of a tooth profile (20) of the fixed, internally toothed gear (2) by a second similarity transformation curve (AD) in which the curve region (AB) is enlarged by a multiple of (λ+1), and is defined by a straight line (24) smoothly connected to an endpoint of the second similarity transformation curve (AD); and a value of λ is less than a maximum value of λ, where the maximum value of λ is obtained when the curve region (AB) is subjected to a similarity transformation with the factor (λ+1), where the origin of the similarity transformation of the curve region (AB) is placed at the position of the deepest intervention (A), such that a remote end of the second similarity transformation curve (AD) is arranged on the motion position curve (M).

According to an embodiment, a stator (100) comprises a stator core and a stator winding (120). The stator winding (120) comprises, for each phase, a phase conductor (121) comprising coil segments (130) and a segment connection portion (128) connecting the coil segments (130) in series, each coil segment (130) using a flat conductor and having a bridge portion and a straight line portion (131) accommodated in two stator slots (111), the phase conductor (121) leading from a lead wire connection portion (141) to a neutral point wire connection portion (142). The phase conductor (121) has a parallel portion (123) and a non-parallel portion (122). The non-parallel portion (122) is laid over the entire circumference in the circumferential direction M times (M is an integer of 2 or more) in every two layers from the outside in the radial direction, and the parallel portion (123) is laid thereover a number of times less than M.