Abstract: An inverter control device 200 includes a current control unit 210 that outputs a voltage commands (Vd*, Vq*), a modulation wave control unit 220 that generates a modulation wave based on the voltage commands (Vd*, Vq*), a pulse generation unit 230 that generates a PWM pulse for controlling an inverter 100 using a modulation wave and a carrier wave of a predetermined frequency, and a pulse shift unit 250 that corrects the phase of the PWM pulse such that the PWM pulse is output in a phase corresponding to a harmonic of a predetermined order of the modulation wave in the near-zero-cross region including the zero-cross point at which the modulation wave changes across 0.

Abstract: A drive apparatus of a synchronous motor includes: a current detecting unit that detects a phase current flowing to the synchronous motor; and a magnetic pole position estimating unit that estimates a magnetic pole position of a rotor of the synchronous motor, based on the phase current detected by the current detecting unit. The magnetic pole position estimating unit includes a first peak-to-peak detector that detects a first peak-to-peak value representing a difference between a maximum value and a minimum value of the phase current, a quadrature component detector that detects a quadrature component of the phase current, and a second peak-to-peak detector that detects a second peak-to-peak value representing a difference between a maximum value and a minimum value of the quadrature component.

Abstract: A motor control device includes a PWM control unit, a carrier frequency setting unit, and a carrier frequency switching calculation unit. The PWM unite generates a signal to drive an inverter by pulse width modulation. The carrier frequency setting unit sets a carrier frequency used for pulse width modulation according to a number of rotations of a motor. The carrier frequency switching calculation unit calculates a frequency switching speed of the carrier frequency and is configured to perform a calculation method. The calculation method includes setting at least one of an emergency mode, a response priority mode, or a fluctuation suppression priority mode in response to various operating conditions.

Abstract: A drive device of a synchronous motor includes a power converter that drives the synchronous motor by sequentially applying positive and negative voltages to respective phases of the synchronous motor; a current detection unit that detects a phase current; and a magnetic pole position estimation unit estimating a magnetic pole position of a rotor based on the phase current. The magnetic pole position estimation unit acquires maximum and minimum values of the phase current while the synchronous motor is stopped, calculates a first magnetic pole position from a subtracted value of an absolute value of the maximum and minimum values, calculates a second magnetic pole position from an added value of the absolute value of the maximum and minimum values, discriminates a polarity of a magnet of the rotor, and estimates an initial magnetic pole position of the rotor from the polarity and the second magnetic pole position.

Abstract: An inverter control device 200 includes a PWM control unit 220 that generates a PWM pulse for controlling an inverter 100, and a pulse edge control unit 250 that performs pulse edge control for correcting (shifting) a phase of a pulse edge of the PWM pulse generated by the PWM control unit 220. The PWM control unit 220 generates a PWM pulse by using a modulation rate based on a voltage command (Vd*, Vq*). The pulse edge control unit 250 corrects the PWM pulse so that a phase difference between a zero cross point where the modulation wave changes across 0 and a pulse edge of the PWM pulse falls within a predetermined range.

Abstract: A random value integration unit 175 outputs a random value output from a random value generation unit 174 in a diffusion width Rand output from a diffusion width generation unit 173 by a product of an output of the random value generation unit 174 and an output of the diffusion width generation unit 173. A triangular wave signal generation unit 176 generates a triangular wave signal corresponding to a second carrier frequency fc2 which is obtained by adding the random value output from the random value integration unit 175 to a first carrier frequency fc1 which is an output of a carrier frequency setting unit 171. That is, a frequency obtained by increasing the diffusion width of the first carrier frequency fc1 is used as the second carrier frequency fc2, and the second carrier frequency is used as the carrier frequency.

Abstract: An inverter control device 200 includes a current control unit 210 that outputs a voltage commands (Vd*, Vq*), a modulation wave control unit 220 that generates a modulation wave based on the voltage commands (Vd*, Vq*), a pulse generation unit 230 that generates a PWM pulse for controlling an inverter 100 using a modulation wave and a carrier wave of a predetermined frequency, and a pulse shift unit 250 that corrects the phase of the PWM pulse such that the PWM pulse is output in a phase corresponding to a harmonic of a predetermined order of the modulation wave in the near-zero-cross region including the zero-cross point at which the modulation wave changes across 0.

Abstract: In Steps S54 to S55, when a change rate ??* of a torque command value to a motor 10 is equal to or greater than a predetermined value, a frequency switching speed ?fc of a carrier frequency fc is set based on the number of rotations N of the motor 10 so that a response frequency ?fc of a frequency switching speed ?fc of the carrier frequency fc becomes faster than a response frequency ?ACR of a current control unit 70. In Steps S54 and S56, when the change rate ??* of the torque command value to the motor 10 is less than a predetermined value, the frequency switching speed ?fc of the carrier frequency fc is set based on a torque command value ?* to the motor 10 and the number of rotations N of the motor 10 regardless of the response frequency ?ACR of the current control unit 70.

Abstract: A random value integration unit 175 outputs a random value output from a random value generation unit 174 in a diffusion width Rand output from a diffusion width generation unit 173 by a product of an output of the random value generation unit 174 and an output of the diffusion width generation unit 173. A triangular wave signal generation unit 176 generates a triangular wave signal corresponding to a second carrier frequency fc2 which is obtained by adding the random value output from the random value integration unit 175 to a first carrier frequency fc1 which is an output of a carrier frequency setting unit 171. That is, a frequency obtained by increasing the diffusion width of the first carrier frequency fc1 is used as the second carrier frequency fc2, and the second carrier frequency is used as the carrier frequency.

Abstract: To appropriately limit a current output from an inverter to a motor according to a state of a cooling mechanism that cools the motor and the inverter. A motor control unit includes a current command unit configured to calculate current command values (Id*, Iq*) for determining a current to be output to a motor on the basis of an input torque command, a motor lock determination unit configured to determine whether the motor is in a locked state on the basis of a motor rotation speed Nrpm indicating a rotation state of the motor, and a torque command limitation unit configured to limit the current to be output to the motor by limiting the torque command on the basis of a cooling water temperature Tc indicating a state of the cooling mechanism in a case where the motor lock determination unit determines that the motor is in the locked state.

Abstract: Described herein is a roof member or a ceiling member, which is capable of reducing cooling and heating energy consumption by reducing influent and effluent heat amounts between indoor and outdoor environments in such a situation that the indoor temperature is kept constant by use of cooling and heating equipment independently of the outdoor air temperature changes. The disclosed member for roofing or ceiling includes an outdoor-side heat insulating layer (A); an indoor-side heat insulating layer (B); and a heat storage layer between the outdoor-side heat insulating layer (A) and the indoor-side heat insulating layer (B).

Abstract: Described herein is an exterior wall member capable of reducing cooling and heating energy consumption by reducing influent and effluent heat amounts between indoor and outdoor environments in such a situation that the indoor temperature is kept constant by use of cooling and heating equipment independently of the outdoor air temperature changes, and to provide a construction including the exterior wall member. The disclosed exterior wall member includes an outdoor-side heat insulating layer (A); an indoor-side heat insulating layer (B); and a heat storage layer between the outdoor-side heat insulating layer (A) and the indoor-side heat insulating layer (B).

Abstract: Described herein is a roof member or a ceiling member, which is capable of reducing cooling and heating energy consumption by reducing influent and effluent heat amounts between indoor and outdoor environments in such a situation that the indoor temperature is kept constant by use of cooling and heating equipment independently of the outdoor air temperature changes. The disclosed member for roofing or ceiling includes an outdoor-side heat insulating layer (A); an indoor-side heat insulating layer (B); and a heat storage layer between the outdoor-side heat insulating layer (A) and the indoor-side heat insulating layer (B).

Abstract: Described herein is an exterior wall member capable of reducing cooling and heating energy consumption by reducing influent and effluent heat amounts between indoor and outdoor environments in such a situation that the indoor temperature is kept constant by use of cooling and heating equipment independently of the outdoor air temperature changes, and to provide a construction including the exterior wall member. The disclosed exterior wall member includes an outdoor-side heat insulating layer (A); an indoor-side heat insulating layer (B); and a heat storage layer between the outdoor-side heat insulating layer (A) and the indoor-side heat insulating layer (B).

Abstract: To appropriately limit a current output from an inverter to a motor according to a state of a cooling mechanism that cools the motor and the inverter. A motor control unit includes a current command unit configured to calculate current command values (Id*, Iq*) for determining a current to be output to a motor on the basis of an input torque command, a motor lock determination unit configured to determine whether the motor is in a locked state on the basis of a motor rotation speed Nrpm indicating a rotation state of the motor, and a torque command limitation unit configured to limit the current to be output to the motor by limiting the torque command on the basis of a cooling water temperature Tc indicating a state of the cooling mechanism in a case where the motor lock determination unit determines that the motor is in the locked state.

Abstract: An object of the invention is to correct a variation of a gain of a current sensor without causing an increase in size and a high cost of an inverter control device. An inverter control device according to the invention includes a 3-phase/dq-axis conversion unit which converts the output current detected by a current sensor into a dq-axis current and a gain adjustment unit which adjusts a detection gain of the current sensor for each phase. In a case where a current value of a secondary harmonic component contained in the dq-axis current is equal to or more than a predetermined threshold, the gain adjustment unit corrects the gain of the current sensor such that the current value of the secondary harmonic component becomes less than the threshold.

Abstract: A light-emitting panel of the present invention has a LED, a surface light-emitting member, a light source holder, and a holder supporting portion. The surface light-emitting member has a rectangular plate shape and at least one surface of front and back surfaces is surface-emitted by entering light from the light source into an incident edge. The light source holder holds the LED such that a light exit of the light source is arranged toward the incident edge. The holder supporting portion is fixed to the surface light-emitting member and hold detachably the light source holder. The light-emitting panel of the present invention can reduce effects of the light source due to thermal expansion of the surface light-emitting member, and easily replace the light source.

Abstract: An object of the invention is to correct a variation of a gain of a current sensor without causing an increase in size and a high cost of an inverter control device. An inverter control device according to the invention includes a 3-phase/dq-axis conversion unit which converts the output current detected by a current sensor into a dq-axis current and a gain adjustment unit which adjusts a detection gain of the current sensor for each phase. In a case where a current value of a secondary harmonic component contained in the dq-axis current is equal to or more than a predetermined threshold, the gain adjustment unit corrects the gain of the current sensor such that the current value of the secondary harmonic component becomes less than the threshold.

Abstract: A resin composition is provided for a sliding member. The composition contains an amorphous resin, flake graphite, and a carbon fiber. The content of the flake graphite is 5 to 40 parts by mass relative to 100 parts by mass of the amorphous resin, and the content of the carbon fiber is 5 to 60 parts by mass relative to 100 parts by mass of the amorphous resin.

Abstract: A surface lighting assembly emitting light from a surface by making light from a light source incident to an incident end surface of a light guide plate is provided. The surface lighting assembly has a laminated body overlapping a diffuser sheet and an opaque plate on a surface of the light guide plate, a frame member arranging along an end edge of the laminated body, and a fastening member fixing the laminated body and the frame member in the thickness direction. The frame member is formed with U-shaped in cross section. In the first and second side surfaces, through holes are formed so as to insert the fastening member and guide it along the longitudinal direction of the frame member.