Abstract: A sealing device according to at least one embodiment includes not less than three arc-shaped fins arranged in an axial direction. The arc-shaped fins include: a first fin which is one of two outermost fins located on an outermost side in the axial direction; a second fin disposed adjacent to the first fin in the axial direction; and at least one third fin disposed opposite to the first fin across the second fin in the axial direction. It is preferable that the third fin is disposed to be inclined with respect to a radial direction such that a tip end portion is located on a side of the first fin in the axial direction relative to a base end portion, and the third fin has a larger inclination angle than the first fin or the second fin with respect to the radial direction.

Abstract: A DC-AC inverter system using a state observer and a control method thereof are provided. The control method of the DC-AC inverter system includes the following steps. The state observer outputs a filter-capacitor-current estimation value at a next sampling time according to a DC link voltage at a current sampling time and a filter-capacitor-voltage actual value at the current sampling time. The filter-inductor-current estimation value at the next sampling time is compared with the filter-capacitor-current estimation value at the next sampling time to obtain a load current estimation value at the next sampling time. An inductor voltage estimator outputs a filter-inductor-voltage estimation value at the next sampling time according to the load current estimation value at the next sampling time. A feed-forward control is performed according to the filter-inductor-voltage estimation value at the next sampling time.

Abstract: A DC-AC inverter system using a state observer and a control method thereof are provided. The control method of the DC-AC inverter system includes the following steps. The state observer outputs a filter-capacitor-current estimation value at a next sampling time according to a DC link voltage at a current sampling time and a filter-capacitor-voltage actual value at the current sampling time. The filter-inductor-current estimation value at the next sampling time is compared with the filter-capacitor-current estimation value at the next sampling time to obtain a load current estimation value at the next sampling time. An inductor voltage estimator outputs a filter-inductor-voltage estimation value at the next sampling time according to the load current estimation value at the next sampling time. A feed-forward control is performed according to the filter-inductor-voltage estimation value at the next sampling time.

Abstract: An endless belt includes a band-shaped belt main body made of a vulcanized rubber, and a coupling part that is made of a thermoplastic resin and is provided between both end parts of the belt main body, wherein the vulcanized rubber of the both end parts of the belt main body and the thermoplastic resin of the coupling part are chemically bonded to each other.

Abstract: A voltage balance control method applicable to a three-phase DC-AC inverter is provided, the voltage balance control method including: multiplying, by a first multiplier, an actual value of a line capacitance voltage by a sine function to generate a first voltage; capturing, by a first filter, a DC part of the first voltage to generate an error DC component; subtracting, by a first subtractor, the error DC component from a target voltage amplitude to generate a second voltage; adjusting, by a first proportional-integral controller, the second voltage to generate an amplitude error compensation value; and adding, by an adder, the amplitude error compensation value with the target voltage amplitude to generate an amplitude reference value. A voltage balance control device applicable to a three-phase DC-AC inverter is also provided.

Abstract: An endless belt includes a band-shaped belt main body made of a vulcanized rubber, and a coupling part that is made of a thermoplastic resin and is provided between both end parts of the belt main body, wherein the vulcanized rubber of the both end parts of the belt main body and the thermoplastic resin of the coupling part are chemically bonded to each other.

Abstract: A dead-time voltage compensation apparatus and a dead-time voltage compensation method are provided. The method includes: converting a DC voltage of an input end of a single-phase DC-AC inverter into a unipolar AC voltage; calculating first to third current values based on a first inductor current value of a inductor, calculating first voltage compensation amounts of a first dead-time and a third dead-time of an AC voltage and a second inductor current value of the AC voltage based on polarities of the first to third current values, calculating fourth to sixth current values based on the second inductor current value, calculating second voltage compensation amounts of a second dead-time and a fourth dead-time of the AC voltage based on polarities of the fourth to sixth current values, and compensating a control reference signal of a processor based on the first and second voltage compensation amounts.

Abstract: A dead-time voltage compensation apparatus and a dead-time voltage compensation method are provided. The method includes: converting a DC voltage of an input end of a single-phase DC-AC inverter into a unipolar AC voltage; calculating first to third current values based on a first inductor current value of a inductor, calculating first voltage compensation amounts of a first dead-time and a third dead-time of an AC voltage and a second inductor current value of the AC voltage based on polarities of the first to third current values, calculating fourth to sixth current values based on the second inductor current value, calculating second voltage compensation amounts of a second dead-time and a fourth dead-time of the AC voltage based on polarities of the fourth to sixth current values, and compensating a control reference signal of a processor based on the first and second voltage compensation amounts.

Abstract: An endless flat belt includes an inner rubber layer 1, a cord core 11 buried in the inner rubber layer 1 and spirally wound at a predetermined pitch in a width direction of the belt, and a reinforcement fabric 2 stuck to the inner rubber layer 1. The cord core comprises polyamide fiber. Opposite ends of the reinforcement fabric 2 are connected with each other into an endless form by adhesion or sewing. A surface rubber layer 3 is stuck to a surface of the reinforcement fabric 2 which is opposite a surface thereof stuck to the inner rubber layer 1.

Abstract: A voltage balance control method applicable to a three-phase DC-AC inverter is provided, the voltage balance control method including: multiplying, by a first multiplier, an actual value of a line capacitance voltage by a sine function to generate a first voltage; capturing, by a first filter, a DC part of the first voltage to generate an error DC component; subtracting, by a first subtractor, the error DC component from a target voltage amplitude to generate a second voltage; adjusting, by a first proportional-integral controller, the second voltage to generate an amplitude error compensation value; and adding, by an adder, the amplitude error compensation value with the target voltage amplitude to generate an amplitude reference value. A voltage balance control device applicable to a three-phase DC-AC inverter is also provided.

Abstract: A sensorless measurement device for filter capacitor current by using a state observer is provided. The sensorless measurement device comprises a chip, wherein the chip comprises the state observer. The state observer is configured to retrieve a filter-capacitor-voltage actual value and a direct current link (dc-link) voltage of a present sampling time. According to the filter-capacitor-voltage actual value and the dc-link voltage, the state observer is configured to output a filter-capacitor-voltage state variable value, a filter-capacitor-current state variable value, and a disturbance-voltage state variable value of a next sampling time. The filter-capacitor-current state variable value is an average current value without ripples.

Abstract: A wiper is made up of an attachment member to be attached to a machine tool, a wiper body formed integrally with the attachment member, a bent-shaped lip support part made of an elastic material and disposed at a lower end of the wiper body, and a lip part connected to the wiper body with the lip support part interposed therebetween. A lip front end portion of the lip part, a tip of which comes into contact with a sliding surface of the machine tool, is made of an elastic material containing an additive material for reinforcement.

Abstract: A ripple-compensation control method and electrical energy conversion device utilizing the same are provided. The ripple-compensation control method is disclosed, adopted by an electrical energy conversion device including a converter configured to perform electrical energy conversion, a controller coupled to control terminals of the converter and controlling a first voltage of a DC node of the converter according to a command value, and a ripple-compensation unit configured to generate a ripple-component voltage of the first voltage and provide the command value generated based on the ripple-component voltage to the controller.

Abstract: A sensorless measurement device for filter capacitor current by using a state observer is provided. The sensorless measurement device comprises a chip, wherein the chip comprises the state observer. The state observer is configured to retrieve a filter-capacitor-voltage actual value and a direct current link (dc-link) voltage of a present sampling time. According to the filter-capacitor-voltage actual value and the dc-link voltage, the state observer is configured to output a filter-capacitor-voltage state variable value, a filter-capacitor-current state variable value, and a disturbance-voltage state variable value of a next sampling time. The filter-capacitor-current state variable value is an average current value without ripples.

Abstract: A voltage compensating method is applied to a converter for converting a DC voltage into an AC voltage. The converter includes a first switch module, a second switch module, and an inductor. In a first dead time period, detect a first current value related to the inductor. According to the first current value, calculate a second current value and a third current value related to the inductor. According to polarities of the first, second and third current values, determine an output mode of the converter indicating a voltage compensation model after the first dead time period. According to the voltage compensation model, the first current value, and the second current value or the third current value, calculate a voltage compensation value. In a second dead time period, adjust a switching time for the first switch module and the second switch module according to the voltage compensation value.

Abstract: A ripple-compensation control method and electrical energy conversion device utilizing the same are provided. The ripple-compensation control method is disclosed, adopted by an electrical energy conversion device including a converter configured to perform electrical energy conversion, a controller coupled to control terminals of the converter and controlling a first voltage of a DC node of the converter according to a command value, and a ripple-compensation unit configured to generate a ripple-component voltage of the first voltage and provide the command value generated based on the ripple-component voltage to the controller.

Abstract: An endless flat belt includes an inner rubber layer 1, a cord core 11 buried in the inner rubber layer 1 and spirally wound at a predetermined pitch in a width direction of the belt, and a reinforcement fabric 2 stuck to the inner rubber layer 1. The cord core comprises polyamide fiber. Opposite ends of the reinforcement fabric 2 are connected with each other into an endless form by adhesion or sewing. A surface rubber layer 3 is stuck to a surface of the reinforcement fabric 2 which is opposite a surface thereof stuck to the inner rubber layer 1.

Abstract: A wiper is made up of an attachment member to be attached to a machine tool, a wiper body formed integrally with the attachment member, a bent-shaped lip support part made of an elastic material and disposed at a lower end of the wiper body, and a lip part connected to the wiper body with the lip support part interposed therebetween. A lip front end portion of the lip part, a tip of which comes into contact with a sliding surface of the machine tool, is made of an elastic material containing an additive material for reinforcement.

Abstract: A voltage compensating method is applied to a converter for converting a DC voltage into an AC voltage. The converter includes a first switch module, a second switch module, and an inductor. In a first dead time period, detect a first current value related to the inductor. According to the first current value, calculate a second current value and a third current value related to the inductor. According to polarities of the first, second and third current values, determine an output mode of the converter indicating a voltage compensation model after the first dead time period. According to the voltage compensation model, the first current value, and the second current value or the third current value, calculate a voltage compensation value. In a second dead time period, adjust a switching time for the first switch module and the second switch module according to the voltage compensation value.

Abstract: The disclosure provides a DC-to-AC power inverting apparatus for photovoltaic modules, which comprises two stages: a first stage including a resonant circuit in series, an isolating transformer with three windings, a full-bridge DC-to-AC converting unit operating in a high-frequency switch mode so as to reduce the transformer volume, and a full-wave rectifier; while a second stage including a half-bridge single-phase inverter unit with two active switches. In the first stage, any high-frequency AC signal produced from the primary winding of the isolating transformer is converter into a DC signal by the full-wave rectifier at the secondary winding of the isolation transformer. Moreover, the switching of the two active switches in the second stage is controlled to operate in a low-frequency mode using a switching frequency synchronized with the frequency of the public electrical supply to control the AC output, and thus to reduce the switching loss of the active switches.