Abstract:
PROBLEM TO BE SOLVED: To provide a power conversion device that is excellent in mountability of a reactor and allows simplifying manufacturing process and improving manufacturing efficiency.SOLUTION: A power conversion device 1 includes a stack 2 and a reactor 5. The reactor 5 is disposed at one end side of the stack 2 in a stacking direction X, and a coil 51 has a wound portion 511 and a pair of extraction portions 512. Each semiconductor module part 20 is provided with power terminals 211, and the stack 2 includes terminal columns 29 composed of the power terminals 211. The pair of extraction portions 512 are disposed at both end portions of a core 52 in an orthogonal direction Y, and are disposed so as to be substantially linear with respect to the different terminal columns 29. One of the pair of extraction portions 512 is connected to the power terminals 211 of the semiconductor module part 20 via a bus bar 6. The bus bar 6 has an extraction connection portion 61, a terminal connection portion 62, and a coupling portion 63. The coupling portion 63 is formed in the stacking direction X so as to pass the outside of the terminal columns 29.
Abstract:
PROBLEM TO BE SOLVED: To provide a motor controller excellent in high-frequency current controllability capable of simplifying a circuit configuration and circuit processing, and also improving the control accuracy. SOLUTION: After detected motor currents are converted into a n-th order dq axis signal and a m-th order dq axis signal by coordinate conversion sections 19, 20, their DC components are extracted by low pass filters 22, 23, deviations between the DC components and instruction values are converted into three-phase AC signals again, and the motor currents are controlled. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method for reducing magnetic sound of an AC rotary electric machine remarkably as compared with prior art. SOLUTION: With reference to the basic frequency component of a polyphase AC current being conducted to the armature of a polyphase AC rotary electric machine, a frequency of (n-1) order in reverse turn and a harmonic current for reducing magnetic sound of (m+1) order in the same turn are superposed on the polyphase AC current thus damping the n-order, m-order and (n+m) order harmonic components of the basic frequency component in a radial magnetic shaking force generated radially in the core of the AC rotary electric machine. The magnetic sound is generated through combination of circumferential vibration and radial vibration of the core being generated by the magnetomotive force of a rotor and reduction of the radial vibration is especially effective for reducing the magnetic sound. Since the harmonic component of radial magnetic shaking force resulting from the magnetomotive force of the rotor and the stator current has a frequency of 6 or 12 times of the basic frequency, it can be canceled by superposing a current having 5 order frequency in reverse order and 7 order frequency in the same phase order as the basic frequency on the stator current. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a technology for altering magnetic noise of an AC rotary electric machine depending on the purpose. SOLUTION: The harmonic component having a frequency n times as high as the basic frequency component of a radial magnetic shaking force being generated in the core of an AC rotary electric machine in the radial direction is altered by superposing a harmonic current for reducing magnetic noise having a frequency of n+1 order (times) with reference to the basic frequency component of a polyphase AC current being fed to the armature of a polyphase AC rotary electric machine on the polyphase AC current. Magnetic noise is generated through synthetic vibration of circumferential vibration and radial vibration of the core caused by magnetomotive force of the rotor and alteration of radial vibration is especially effective for altering magnetic noise. Since the harmonic component of a radial magnetic shaking force caused by harmonic components having frequencies of 3, 5, 7 and 13 times as high as the basic frequency of magnetomotive force of the rotor have frequencies of 6 or 12 times as high as the basic frequency, it can be altered well by superposing a current having a frequency of 7 or 13 times as high as the basic frequency on the stator current. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a reactor capable of improving a heat radiation performance by reducing vibration.SOLUTION: A reactor 1 comprises: a cylindrical coil 2 generating a magnetic flux by energization; a core 3 made of magnetic powder mixture resin formed by mixing resin with magnetic powder, and inside which the coil 2 is embedded; and a columnar central core part 4 arranged in an axial line direction X of the coil 2 on an inner peripheral side of the coil 2, and at least part of which is embedded inside the core 3. Contact faces 401, 402 contacting a stationary member holding and fixing the central core part 4 from both sides in the axial line direction X are formed at both ends of the axial line direction X of the central core part 4. Surface roughness Rz of a contact face 403 of the central core part 4 contacting the core 3 is larger than surface roughness Rz of the contact faces 401, 402. An intermediate face 404 having surface roughness Rz smaller than that of the contact face 403 and larger than that of the contact faces 401, 402 is formed on the central core part 4.
Abstract:
PROBLEM TO BE SOLVED: To provide a vibration measurement method and a vibration measurement device of a reactor device, which can measure a vibration value of vibration occurring by electrification of the reactor device in time shorter than a conventional case.SOLUTION: The vibration measurement method for measuring the vibration value of the reactor device 10 includes: a characteristic that a Youg's modulus changes with a temperature change of a dust core; a frequency range determining step for determining a frequency range (prescribed range) where a current frequency f (frequency) of AC current Iac which is made to flow to a coil 13 is changed in accordance with a temperature range for changing a temperature of the reactor device 10; and a vibration value measuring step for changing the current frequency f of the AC current Iac which is made to flow to the coil 13 within the frequency range and measuring the vibration value of the vibration occurring in the reactor device 10. Since the current frequency f of the AC current Iac which is made to flow to the coil 13 is changed only in the frequency range with such structure, the vibration value can be measured in short time.
Abstract:
PROBLEM TO BE SOLVED: To reduce the circular ring strength of portions near the flange in a cylinder. SOLUTION: A stator assembly 1 includes a cylindrical member 3 having the cylinder 31 with a coil assembly 4 disposed on the inner circumferential face and a flange 32 protruded at the circumferential edge of the cylinder 31 in a direction perpendicular thereto. The flange 32 is provided with notches 321A, 321B, 321C, 322A, 322B, 322C to reduce the circular ring strength of the flange 32, causing its fastening force to be approximated for the other positions. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To solve the problem that magnetic characteristics in a rotary electric machine where a plurality of partial cores are arranged in a circumferential direction are deteriorated and to simplify a manufacture process. SOLUTION: Respective electromagnetic ring boards 100 which are laminated and constitute the rotary electric machine are divided into a plurality of parts at prescribed positions of the circumferential direction. In the electromagnetic ring board 100, a plurality of core sheets 102 are arranged in the circumferential direction. A pair of core sheets 102 and 102 adjacent in the circumferential direction have butting parts 103. A pair of electromagnetic ring boards 100 and 100 adjacent to an axial direction have the butting parts 103 in different positions in the circumferential direction and have through holes for fixing housing 100a in same positions of the circumferential direction and a radial direction. Since the core sheets 102 are formed in the same shapes and are shifted to the circumferential direction by a prescribed angle so as to realize the structure, only one type of core sheet is required. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for reducing magnetic noise of an AC rotary electric machine remarkably. SOLUTION: The harmonic component having a frequency n times as high as the basic frequency component of a radial magnetic shaking force being generated in the core of an AC rotary electric machine in the radial direction is attenuated by superposing a harmonic current for reducing magnetic noise having a frequency of n+1 order (times) with reference to the basic frequency component of a polyphase AC current being fed to the armature of a polyphase AC rotary electric machine on the polyphase AC current. Magnetic noise is generated through synthetic vibration of circumferential vibration and radial vibration of the core caused by the magnetomotive force of the rotor and reduction of radial vibration is especially effective for reducing magnetic noise. Since the harmonic component of a radial magnetic shaking force caused by magnetomotive force of the rotor and stator current has a frequency six or twelve times as high as the basic frequency, it can be canceled by superposing a current having a frequency seven to thirteen times as high as the basic frequency on the stator current. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To prevent expansion of the diameter of a stator by resin injection pressurizing, at mold forming. SOLUTION: A method of manufacturing a stator includes a first step wherein a thermally expanded fixing ring 10 is inserted on the outer periphery of a stator 1 and then the fixing ring 10 is cooled to be fit; a second step wherein the stator 1 is mold-formed to fabricate a mold stator 50; and a third step wherein the fixing ring 10 is thermally expanded to remove it from the mold stator 50. COPYRIGHT: (C)2011,JPO&INPIT