Abstract: There is a method of fault clearance for a voltage source converter that interconnects a DC network and an AC network. The voltage source converter is connected to the DC network via one or more DC circuit interruption devices. The method comprises the steps of: (a) detecting a fault in the DC network; (b) carrying out a primary protection sequence, wherein the step of carrying out the primary protection sequence involves carrying out a first sub-sequence that includes the steps of: i. opening the or each DC circuit interruption device, ii. setting a DC power order of the voltage source converter to zero, iii. controlling the voltage source converter to exchange re-circuit breaker active power with the AC network.

Abstract: Techniques for improving electro-static discharge (ESD) performance in integrated circuits (IC's). In an aspect, one or more protective diodes are provided between various nodes of the IC. For example, protective diode(s) may be provided between the drain and gate of an amplifier input transistor, and/or between the drain and ground, etc. In certain exemplary embodiments, the amplifier may be a cascode amplifier. Further aspects for effectively dealing with ESD phenomena are described.

Abstract: Provided is an inverter system capable of more economically and efficiently performing photovoltaic power generation by automatically switching an integrated operation and an independent operation of inverters according to voltage values and current values of photovoltaic panels without a separate communication function. The inverter system for photovoltaic power generation according to an exemplary embodiment of the present disclosure is an inverter system which changes direct current power output from a first photovoltaic panel and a second photovoltaic panel to alternating current power and includes: a first inverter and a second inverter, in which all of the outputs of the first and second photovoltaic panels are applied to the first inverter, or the output of the first photovoltaic panel is applied to the first inverter, and the output of the second photovoltaic panel is applied to the second inverter according to output values of the first and second photovoltaic panels.

Abstract: A method for optimizing the yield of a photovoltaic array with an inverter is provided. The method includes: a) cyclically measuring a current (Igiv) and a DC link voltage (U) when controlling the inverter by a MPP method (Maximum Power Point) and storing a measured current value, b) lowering the DC link voltage (U) to a value that exceeds by no more than 100% a minimum DC link voltage (Umin) admissible for operation of the inverter, c) measuring a current (Ired) with a reduced DC link voltage and comparing it with a previously stored value at a given time for the current (Igiv), d) if a prescribed threshold for a difference between the two currents (Ired, Igiv) is exceeded, a searching process for a global MPP (Maximum Power Point) is initiated, e) otherwise, operation is continued at a power maximum (MPP) with a last-stored current value for the current (Igiv).

Abstract: A disturbance, for example, a frequency variation, is generated in at least a portion of the power distribution network. The disturbance may be generated, for example, by an uninterruptible power supply (UPS) or some other component of the power distribution network, such as a switch. At least one node of the network experiencing the disturbance is identified and a topology of the power distribution network is determined responsive to identifying the at least one node. The at least one node may be identified by detecting a voltage-related artifact corresponding to the disturbance. A phase-locked loop (PLL)—based circuit may be used for fast artifact detection. Groups of devices in the network may be identified from the artifacts, and combinatorial optimization techniques may be used to determine connectivity within such groups.

Abstract: A single-wire electric transmission line system that includes a power sources having first and second poles and a phase shifting device, coupled to one of the poles of the power source, in such a manner that the phase shifting device shifts the phase of a first signal propagating through the pole such that the shifted phase of the first signal will be essentially identical to the phase of a second signal propagating through the other pole. The shifted first signal is added to the second signal with essentially the same phase of second signal, whenever both poles are connected together to form a single-wire, through which the resulting added signal propagates.

Abstract: We describe a photovoltaic power conditioning unit for delivering power from multiple photovoltaic panels to an ac mains power supply output, comprising: a dc input for receiving power from multiple photovoltaic panels; an ac output for delivering ac power to the ac supply; a bank of electrolytic energy storage capacitors for storing energy from the dc source for delivery to the ac supply; a dc-to-ac converter coupled to the ac output and having an input coupled to the bank for converting energy stored in the bank to ac power for the ac supply; and further comprising: a plurality of sense and control circuits, one for each capacitor in the bank, wherein each circuit is coupled in series with a capacitor, and is configured to disconnect the associated capacitor from the bank upon detection of a current flow through the associated capacitor of greater than a threshold current value.

Abstract: Disclosed herein are the energy storage system of an Uninterruptible Power Supply (UPS) equipped with the battery and a method of driving the same. The energy storage system includes a commercial power source unit configured to supply a first power source to a load, and the battery configured to supply a second power source to the load. And the system monitors a power failure state in the commercial power source unit, determines a charging state of the battery, and controls the commercial power source unit and the battery in response to output of monitoring or determination, so that the first power source or the second power source is supplied to the load. A power reservation ratio for the use of power can be increased by reducing power used during daytime.

Abstract: Systems for reducing power usage and/or wastage use sensors to gather information about a circuit and its usage. Triggers are identified based on the information from the sensors, and subsequently used to control power delivery by reversibly effectuating energization and deactivation of particular circuits through smart nodes.

Abstract: There is provided a filter for receiving a rectangular or stepped source voltage to be filtered and for providing an output voltage, the filter including means arranged to determine the output voltage in dependence on the frequency components of the source voltage within the filter passband, and independent of output current drawn.

Abstract: A method and apparatus for controlling energy supply to energy consuming devices are provided. The method includes acquiring a first amount of energy to be used in at least one energy consuming device, determining the amount of energy stored in an energy storage, and optionally transmitting an energy supply request message to an energy supplier based on the amount of energy to be consumed in an energy consuming device and the amount of stored energy.

Abstract: The invention provides a solar photovoltaic three-phase micro-inverter, comprising DC terminals, connected with three DC photovoltaic assemblies for receiving DC; three single-phase inverter circuits, having DC input terminals connected with the DC photovoltaic assemblies via the terminals, for converting the DC to AC; AC terminals, connected with the AC output terminals of the inverter circuits and a three-phase AC power grid, for outputting the AC generated by the inverter circuits; wherein DC input terminals of each inverter circuit are connected in parallel with each other, and AC output terminals are connected with one phase of the three-phase AC power grid and a neutral wire via the AC terminals. The invention further provides a solar photovoltaic generation system. The invention connects DC sides of three single-phase inverter circuits in parallel, which can simply eliminate ripple power at DC side input terminals in a three-phase micro-inverter.

Abstract: A distributed energy conversion system may include one or more DC power sources and two or more inverters to convert DC power from the power sources to AC power. The AC power from the two or more inverters may be combined to provide a single AC output. A module may include one or more photovoltaic cells and two or more inverters. An integrated circuit may include power electronics to convert DC input power to AC output power and processing circuitry to control the power electronics. The AC output power may be synchronized with an AC power distribution system.

Abstract: Provided is a power system that can arbitrarily set output power while stabilizing output voltages. Connection terminals 13 and 23 of lower power sources 1 and 2 are connected to external connection terminals 41 in parallel. Voltage measurement section 31 measures voltage values of external connection terminals 41 as measured voltage values. Power converters 12 and 22 measure power supply capacities of lower power sources 1 and 2, respectively. Output instruction section 32 adjusts power or currents flowing through connection terminals 13 and 23 based on the measured voltage values and the power supply capacities so that the measured voltage values are included in a predetermined voltage range.

Abstract: A static converter with parallel architecture or series architecture comprises a plurality of switching cells, arranged in parallel or in series, and controlled in a decentralized manner by associated control modules, strung together according to a loop by a series of communication links. Each control module comprises a single and different local unit for generating the triangular carrier of the module which controls the positioning of its interleaving phase as a function only of the signals of the triangular carriers of the two adjacent modules. Each control module comprises a local unit for balancing the currents of branches and/or a unit for internal regulation of the output voltage of AVP type, or a local unit for balancing the cell voltages and/or a unit for internal regulation of the input current or output current of the ACP type.

Abstract: The present disclosure provides an electric power supplying apparatus including: an electric storage device; and a control portion configured to control processing for mixing an output from the electric storage device, and an electric power of an external electric power system with each other in accordance with at least one of a peak shift command, a load electric power, and a remaining capacity of the electric storage device, wherein an alternating current electric power is formed in the mixing processing. When the electric power supplying apparatus further includes an electric power generating apparatus, processing for mixing an output from the electric power generating apparatus, an output from the electric storage device, and an electric power of the external electric power system with one another, is controlled.

Abstract: A wireless power transmission system, and an apparatus and method for controlling power in the wireless power transmission system are provided. The method includes determining a resonance frequency of the wireless power transmission system in which a wireless power transmission efficiency is greater than or equal to a predetermined value. The method further includes generating an operation power based on the wireless power transmission efficiency, the operation power being used to operate a target device. The method further includes transmitting the operation power to the target device. The method further includes controlling an amount of the operation power received by the target device to be within a predetermined range.

Abstract: There is provided a power transmitting apparatus including: a power supply, a power transmitting inductor, a mutual coupling adjusting unit and a control unit, in which the power supply supplies AC power, the power transmitting inductor transfers the AC power to a power receiving apparatus through magnetic coupling with a power receiving inductor in the power receiving apparatus, the mutual coupling adjusting unit adjusts a relative position between the power transmitting inductor and the power receiving inductor, and the control unit controls the mutual coupling adjusting unit, based on a mutual coupling coefficient between the power transmitting inductor and the power receiving inductor.

Abstract: A method and a system for self-regulating wireless power transmitted to a wireless power receiver (WPR) are provided. An auto-tuning network is operably coupled within the WPR. The auto-tuning network includes an impedance network that dynamically increases, decreases, or maintains an amount of the received wirelessly transmitted power by detecting changes in a rectifier load disposed in the WPR and/or in a rectifier output voltage in the WPR. The auto-tuning network self-regulates the wireless power received from a wireless power transmitter (WPT) obviating the need for conventional communication messages. The WPT is hence free from a modulator/demodulator block and an out-of-band communication block and operates over a limited operating range to enable a simpler design for passing electromagnetic compliance regulations.

Abstract: A wireless electrical power system provides access to high voltage and/or low voltage electrical power at portable articles that are positionable at different locations within a work area, and substantially without the use of exposed cabling. The power system includes a portable article that is positionable at two or more locations within a work area. The work area is defined by a plurality of surfaces, at least one of which incorporates a wireless electrical power transmitter. The portable article incorporates a wireless electrical power receiver that is configured to receive electrical power from the wireless power transmitter when the wireless power receiver is sufficiently close to the wireless power transmitter. The portable article further includes an electrical power outlet that provides users in the work area with access to the electrical power.

Abstract: A method for determining the self-discharge current of a lithium-ion battery provided with a positive electrode, a negative electrode, and an electrolyte arranged between the positive and negative electrodes includes charging the battery until a metal lithium layer is formed between the electrolyte and the negative electrode, measuring the open-circuit voltage of the battery at two moments, and determining the self-discharge current from the variation of the voltage measured between the two moments.

Abstract: A charging device for commonly charging multiple digital electronic devices has a housing, a charge control unit and multiple outlet strips. The charge control unit is mounted inside the housing and has multiple relays. The outlet strips are electrically connected to the charge control unit with each outlet strip electrically connected to one of the relays. A charging method corresponding to the charging device is performed by the charge control unit without the need of users' configuration during a charge cycle. The charge method automatically determines if the outlet strips can simultaneously supply power to charge during each charge schedule of the charge cycle. At least one outlet strip supplies power to charge during each charge schedule, and each outlet strip supplies power to charge once, thereby achieving optimization for the charging process with automatic determination and enhancing charging efficiency and users' operational convenience.

Abstract: Systems and methods of pre-charging battery cells that can reliably pre-charge battery cells included in a plurality of series-connected battery modules. The systems and methods can monitor a value of a pre-charge current provided to the plurality of series-connected battery modules, as well as monitor a voltage level of the battery cells within each battery module. The systems and methods can further switchingly interrupt the pre-charge current within each battery module once it has reached a predetermined threshold current value or the battery cells within the battery module have been charged to a UVP level, causing a flyback current to flow into the battery cells of each battery module that have not yet been charged to the UVP level. Once the battery cells within each battery module have been charged to the UVP level, the systems and methods can provide a full-charge current to the plurality of series-connected battery modules.

Abstract: An electricity distribution system includes an electricity supply control unit that receives information on power consumption, estimates the current and the future power consumption, and controls the supply of electricity to the electric device; an information display unit that displays information on a power use situation of an electric device electrically connected with the electricity supply control unit; and a battery server that accumulates power, in which the electricity supply control unit communicates the information on the power consumption with a new electric device when the new electric device is electrically connected, and when the amount of available power is exceeded by supplying electricity to the electric device, does not supply electricity to the electric device, makes the information display unit display that the amount of available power is exceeded by supplying electricity to the information display unit, and determines whether to use the power accumulated in the battery server.

Abstract: A system including a remote server connected over a network to a battery charger is configured to track usage of rechargeable batteries. Values of various sensed parameters of a battery, such as temperature, charge, current, and water level are stored with the battery and uploaded to the remote server, either wirelessly or through the network, and either directly from the battery or by way of the battery charger when the battery is coupled to the battery charger. The remote server operates to determine the condition, value and warranty of the battery based on the sensed parameters and on the user history of the battery. Alerts and warnings can be forwarded to the user and/or an enterprise manager or shop manager in the case of enterprise vehicles such as warehouses operating multiple electric forklifts, or rental car agencies, so that multiple rechargeable batteries can be readily tracked, monitored and maintained.

Abstract: A battery pack cooling and charging device includes a charging module for a battery pack, a cooling fan, a power source module and a cooling fan control module. The cooling fan control module is capable of controlling the cooling fan for cooling and is connected with the cooling fan. During the charging operation, a rotational speed of the cooling fan for cooling the battery pack and a charging module is changed by detecting parameters such as fan operation time, a battery pack internal resistance, a charging module temperature, and a battery pack voltage. The rotational speed of the cooling fan is reasonably adjusted, thus noise of the cooling fan is reduced and energy consumption is reduced according to different phases of the charging process by regarding one parameter or combinations of parameters as conditions for changing the rotational speed of the fan.

Abstract: There is provided a control system including a plurality of first apparatuses, and at least one second apparatus that is connected to each first apparatus. The first apparatuses include a plurality of conversion units, and each include a control unit controlling an on/off state of each conversion unit by referring to a table. The second apparatus includes a power storage unit and a charging control unit controlling charging of the power storage unit. The conversion units each convert a first voltage supplied from a power generating apparatus to a second voltage according to a magnitude of the first voltage. The second voltage output from at least one of the conversion units is supplied to the second apparatus. The charging control unit controls charging of the power storage unit in accordance with a variation in the second voltage.

Abstract: Degradation of a battery is prevented or the degree of the degradation is reduced, and charge and discharge performance of the battery is maximized and maintained for a long time. A reaction product, which is formed on an electrode surface and causes various malfunctions and degradation of a battery such as a lithium-ion secondary battery, is dissolved by application of electrical stimulus, specifically, by applying a signal to supply a current reverse to a current with which the reaction product is formed (reverse pulse current).

Abstract: A battery system including a battery unit including a plurality of battery cells, and a control device including a power supply boot-up unit. The power supply boot-up unit is configured to receive a voltage from the plurality of battery cells, and supply a control signal in response to the voltage supplied by the plurality of battery cells.

Abstract: Systems, methods, and apparatus are disclosed for wirelessly charging an electric vehicle. In one aspect, a method of wirelessly charging an electric vehicle is provided. The method includes, obtaining a request from the electric vehicle for a level of charging power to be delivered from a power transmitter to the electric vehicle via a charging field. The method further includes controlling a current or voltage of the power transmitter based on a power efficiency factor and the requested level of charging power.

Abstract: A charging assembly and a charging control method are provided for charging a battery pack according to an actual voltage of a battery in a battery pack. The charging assembly includes a battery pack having a battery with a rated charging current, a charger having a charging module for outputting an output voltage and an output current, and a charging circuit between the charging module and the battery. A method of operation includes: detecting the output current and the output voltage; calculating an actual voltage value on the battery; and determining whether to decrease or keep the output current or increase the output current of the charging module.

Abstract: A system for charging a capacitor used to power measurement-while-drilling equipment includes a power bus, which is electrically connected to the capacitor; a first pair of battery terminals; switching circuitry for electrically connecting the power bus to and disconnecting the power bus from the first pair of battery terminals; and a controller, for controlling the switching circuitry, which is configured to charge the capacitor by applying a first pulse width modulated control signal to control the switching circuitry. The first pulse width modulated control signal has a duty cycle selected such that the voltage of the first battery remains above a first minimum operating voltage while the capacitor is being charged.

Abstract: ECU executes program including the steps of turning on an overcharge tentative determination flag and performing limitation on Win in a case where a rising rate ?TB is higher than or equal to ?TB(0), and a current average value IBs is a value on a side of charging, and the steps of turning off the overcharge tentative determination flag and cancelling the limitation on Win in a case where the rising rate ?TB is lower than or equal to ?TB(1), or the current average value IBs exhibits a value on a side of discharging, and the steps of determining that a battery is in the overcharging state and executing a fail safe process in a case where the integrated value IBs of current from a time point at which the overcharge tentative determination flag is switched from an off-state to an on-state becomes greater than or equal to IBs(0).

Abstract: A wireless power transmitting device including a signal processing unit, a wireless transceiver, and a controller. The controller is configured to control a detection signal for detecting an external device to be transmitted via a wireless power transmitter, and if an authentication request signal is received from the external device in response to the detection signal, control an authentication response signal including an ID (Identification) assigned to the external device, and further, if a power profile signal including power amount information of the external terminal and change information indicating whether the power amount information is changed is received from the external terminal, control an allocation signal including wireless power allocation information indicating an allocated slot, determined based on the power amount information, to the external terminal.

Abstract: Various embodiments relate to a method, machine-readable medium, and a system for preventing demagnetization of a magnetically sensitive object comprising detecting, by a first identification sensor at a wireless charging transceiver, a foreign object; determining, by a processor using information from the first identification sensor, whether the foreign object is magnetically sensitive; and responsive to a determination that the foreign object is magnetically sensitive, preventing the wireless charging transceiver from operating.

Abstract: A method and an apparatus for controlling wireless power transmission are provided. An apparatus for controlling wireless power transmission includes a controller configured to determine an output voltage of a power factor correction unit based on charging information of a battery, the power factor correction unit configured to correct an input voltage into the determined output voltage, and output a variable voltage, and a resonance unit configured to transmit power converted from the variable voltage to a wireless power reception apparatus.

Abstract: Some embodiments provide a system for charging devices. The system includes a master device and a slave device. Some embodiments provide a method for charging devices in a system that includes a slave device and a master device. The slave device includes (1) an antenna to receive a radio frequency (RF) beam and (2) a power generation module connected to the antenna that converts RF energy received by the slave antenna to power. The master device includes (1) a directional antenna to direct RF power to the antenna of the slave device and (2) a module that provides power to the directional antenna of the master device.

Abstract: A near field communication and wireless charging device includes a coil, a tuning module, a near field communication module, a wireless charging module, and a power storage device. The coil is configured to receive electromagnetic waves. The tuning module is electrically connected to the coil. The near field communication module includes an attenuator and a near field communication control circuit. The attenuator is configured to attenuate the energy of electromagnetic waves transmitted from the tuning module. The near field communication control circuit is electrically connected to the attenuator. The power storage device is electrically connected to the wireless charging module. Electromagnetic waves are magnetically coupling to the coil, and the coil transmits signals of the electromagnetic waves to the near field communication module through the tuning module, or transmits the energy of the electromagnetic waves to the power storage device through the tuning module and the wireless charging module.

Abstract: A device for the inductive transmission of electrical energy, having at least one induction coil which is connected, or connectible, to a consumer and/or to a rechargeable battery, and having a communications device, which encompasses at least one control unit and is configured to modulate the load of the induction coil. It is provided that the communications device has a DC converter, whose output is connected or connectible to the consumer/the battery, and whose input is connected to the induction coil, the control unit controlling the DC converter for a load modulation.

Abstract: A wireless charger includes a base having a base opening and an interior cavity defined by upper and lower shells and an inner sidewall extending between the upper and lower shells to define the base opening. An aperture is formed through the inner sidewall between the interior cavity and the base opening and a hinge is connected to the base within the interior cavity and extends through the aperture. The charger further includes a wireless charging assembly pivotably attached to the base by the hinge and moveable between a down position in which the wireless charging assembly is disposed within the base opening and an up position in which the wireless charging assembly extends outside the base. The charging assembly is configured to wirelessly transmit power across the charging surface to a power receiving unit of a portable electronic device.

Abstract: A charging system includes a transmission line, a power adaptor, and an electronic device. The transmission line includes a first terminal and a second terminal. The power adaptor is coupled to the first terminal and generates a charging voltage and a first voltage signal. The charging voltage is at a first voltage level. The electronic device is coupled to the second terminal and receives the first voltage signal. When the first voltage signal is larger than a first preset voltage signal, the electronic device outputs a second voltage signal to the power adaptor. When the second voltage signal is larger than a second preset voltage signal, the power adaptor adjusts the charging voltage into a second voltage level.

Abstract: There is provided an energy collection system comprising a first switching station electrically connected to a first set of one or more transformation units for receiving a first electrical power generated thereby; a second switching station electrically connected to a second set of one or more transformation units for receiving a second electrical power generated thereby; a sub-transmission station having a first primary electrical connection with the first switching station and a second primary electrical connection with the second switching station for receiving the first and second electrical powers; and a secondary electrical connection between the first and second switching stations; wherein the secondary electrical connection and the first and second primary electrical connections form, alone or using further connections, a closed-loop electrical circuit between the first switching station, the second switching station and the sub-transmission station.

Abstract: A system is provided for powering an optical network terminal, including a power adapter connected to the optical network terminal and configured to power the optical network terminal; and a battery tray, connected to the power adapter, configured to supply auxiliary power to the optical network terminal through the power adapter from one or more batteries contained within the battery tray, wherein the battery tray is configured to allow removal and replacement, at the customer premise, of the one or more batteries.

Abstract: A device includes a connection receiving power from a power source under normal conditions and circuitry configured to determine, based on an input from the connection, when the power from the power source is absent; output, when the power source is absent, a test signal at the connection; and generate a detection signal based on current flow generated following the output of the test signal, wherein the detection signal indicates a position of a switch connecting the circuitry to the connection and the generated detection signal indicates the switch is closed when the current flow is above a threshold. The circuitry is configured such that when the power from the power source is absent, the switch is closed, and plural devices are connected on the supply side of the switch, the plurality of devices on the supply side appear as a substantially open circuit to the test signal.

Abstract: Embodiments are directed to detecting and identifying a type of a wireless power device in a wireless power transfer field. According to one aspect, a method for identifying a type of an object within a power transfer region of a wireless power transmitter configured to transfer power to a device including a wireless power receiver is provided. The method includes monitoring a change in a power drawn by the wireless power transmitter. The method further includes receiving, from the wireless power receiver, a signal indicative of a change in power received by the wireless power receiver. The method further includes identifying the type of the object based on the monitored change in the power drawn and the received signal.

Abstract: One example discloses an inductive power supply device, comprises: an inductive coupler including a resonant circuit having a first resonant state in response to an object at a first distance from the inductive power supply, and a second resonant state in response to the object at a second distance from the inductive power supply; a driver circuit coupled to send a first power-level to the inductive coupler when in a charge-object state and to send a second power-level to the inductive coupler when in a detect-object state, wherein the second power-level is less than the first power-level; and an object detector coupled to detect the first and second resonant states and place the driver circuit in the charge-object state in response to the first resonant state, and place the driver circuit in the detect-object state in response to the second resonant state.

Abstract: A motor stator manufacturing method includes: prefabricating separate detachable coil sets and coil wire ends thereof; arranging connection points on a printed circuit board on which to assemble or reassemble the separate detachable coil sets; selectively connecting or reconnecting the coil wire ends with the connection points of the printed circuit board to form or change into a predetermined design of various motor stator types; and mounting the separate detachable coil sets in a stator seat to form or change into the AC motor stator type.

Abstract: An electrical machine has a stator-rotor configuration in which the rotor has at least two poles. The poles are configured to rotate in an angle and to electromagnetically interact with one or more teeth that is a part of a stator adjoined in a fixed position to the electrical machine. The configuration forms a gap in the lateral direction between the poles and the teeth. At least one of the poles is formed of a permanent magnet material and a magnetic flux intensifier is arranged relative to at least one of the poles and one of the teeth. The magnetic flux intensifier is configured to concentrate the magnetic field lines between a pole and the teeth.

Abstract: A motor includes a first rotor and a second rotor which are disposed at opposite sides of a stator, and each of the first rotor and the second rotor includes a plurality of modules, each including a pair of permanent magnets and a connection unit which connects ends of the permanent magnets.

Abstract: Provided is a rotor for a rotating electrical machine which is capable of minimizing increases in eddy current losses via a magnet, while making insulating film processing of the surface of the magnet unnecessary. The rotor for the rotating electrical machine includes: a rotor core having a magnet insertion hole extending inside; a magnet inserted in the magnet insertion hole; and an insulating filler which is filled between the inner wall of the magnet insertion hole and the magnet so as to secure the magnet. The magnet is secured by the filler in such a manner that the surface of the magnet inside the magnet insertion hole is in an inclined position with respect to the extending direction of the inner wall of the magnet insertion hole.