JPH0379959B2 - - Google Patents
Info
- Publication number
- JPH0379959B2 JPH0379959B2 JP56186795A JP18679581A JPH0379959B2 JP H0379959 B2 JPH0379959 B2 JP H0379959B2 JP 56186795 A JP56186795 A JP 56186795A JP 18679581 A JP18679581 A JP 18679581A JP H0379959 B2 JPH0379959 B2 JP H0379959B2
- Authority
- JP
- Japan
- Prior art keywords
- carrier wave
- frequency
- pwm
- pwm inverter
- inverter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Description
【発明の詳細な説明】
本発明は出力電圧がPWM制御されるPWMイ
ンバータの制御装置に係り、特に交流電動機を制
御するのに好適なPWMインバータの制御方法お
よび装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a PWM inverter whose output voltage is PWM-controlled, and particularly to a method and device for controlling a PWM inverter suitable for controlling an AC motor.
PWMインバータはパルス幅変調により出力電
圧を制御される。インバータの出力電圧制御は出
力電圧基本波分を指令する正弦波の変調波と周波
数が一定である三角波の搬送波を比較してPWM
信号を得て行つている。インバータの出力電圧に
は原理上、基本波分の他にほぼ一定周波数の高調
波成分が含まれる。このため、PWMインバータ
で交流電動機を駆動する場合には交流電動機に高
調波電流が流れ、磁気音を発生するという欠点が
ある。 The output voltage of a PWM inverter is controlled by pulse width modulation. Inverter output voltage control is achieved by comparing a sine wave modulation wave that commands the output voltage fundamental wave with a triangular wave carrier wave whose frequency is constant.
I'm getting a signal and going. In principle, the output voltage of an inverter includes harmonic components at a substantially constant frequency in addition to the fundamental wave component. For this reason, when driving an AC motor with a PWM inverter, there is a drawback that harmonic current flows through the AC motor and generates magnetic noise.
PWMインバータにより交流電動機を駆動する
場合、高調波電流による磁気吸引力が発生し、鉄
心のある部分の機械共振点と一致するとそこに大
きな振動を生じ磁気音を発生する。機械共振によ
る振動は一定周波数の加振力が連続して加えられ
ると大きくなるものである。この場合の加振源は
高調波電流により発生する磁気吸引力であり、そ
れが連続して加えられると鉄心の振動の振幅は鉄
心の材質、形状等で定まる時定数に従つて時間経
過と共に大きくなる。鉄心の振動はやがて定常値
に達するが、非常に大きなものとなり大きな磁気
音を発生する。 When driving an AC motor with a PWM inverter, a magnetic attraction force is generated by harmonic current, and when it coincides with the mechanical resonance point of a certain part of the iron core, large vibrations occur there and generate magnetic sound. Vibration due to mechanical resonance increases when an excitation force of a constant frequency is continuously applied. The excitation source in this case is magnetic attraction generated by harmonic current, and when it is continuously applied, the amplitude of the vibration of the core increases over time according to a time constant determined by the core material, shape, etc. Become. The vibration of the iron core eventually reaches a steady value, but it becomes extremely loud and generates a loud magnetic noise.
本発明は上記点に対処して成されたもので、そ
の目的とするところは高調波成分に起因する磁気
音を低減することのできるPWMインバータの制
御方法および装置を提供することにある。 The present invention has been made in response to the above-mentioned problems, and its purpose is to provide a PWM inverter control method and device that can reduce magnetic sound caused by harmonic components.
本発明はPWMインバータの出力周波数が一定
であつてもPWM信号の周波数を決定する搬送波
の周波数を時間的に変化させることによつて
PWM信号の周波数を変化させるようにしたこと
にある。 Even if the output frequency of the PWM inverter is constant, the present invention temporally changes the frequency of the carrier wave that determines the frequency of the PWM signal.
The reason is that the frequency of the PWM signal is changed.
更に具体的に言うならば、PWMインバータの
出力周波数が一定の場合においてもPWM信号の
周波数を変化させるようにしたことにある。 More specifically, even when the output frequency of the PWM inverter is constant, the frequency of the PWM signal is changed.
以下本発明の一実施例を図面に基づいて説明す
る。 An embodiment of the present invention will be described below based on the drawings.
同図において整流ブリツジ１は三相交流電源９
からの交流を直流に変換しPWMインバータ２に
印加する。搬送波制御回路３は搬送波（三角波）
の周波数を周期的に変化させる正弦波や三角波等
のパターン信号を出力し、また搬送波中心周波数
設定回路１０は搬送数の中心周波数を設定するた
めの一定信号（直流信号）を出力する。パターン
信号と中心周波数設定信号は加算され搬送波発生
回路４に入力される。パターン信号と中心周波数
設定信号の加算値はPWMンバータ２のスイツチ
ング周波数、つまりPWM信号の周波数を指令す
るPWM周波数指令となる。搬送波発生回路４は
入力電圧（PWM周波数指令）に応じた周波数の
搬送波を発生するものであり、搬送波制御回路３
からのパターン信号に基づいて周波数が変化する
搬送波を比較器５に出力する。比較器５は出力電
圧パターン発生回路６の発生する変調波と搬送波
発生回路４の搬送波を比較し、PWM信号をゲー
ト回路８に出力する。そしてゲート回路８は
PWM信号を増幅してPWMインバータ２を制御
する。PWMインバータ２は出力電圧パターン発
生回路６の出力信号に比例した交流電圧を出力
し、交流電動機７を駆動する。 In the figure, the rectifier bridge 1 is a three-phase AC power supply 9.
The alternating current from the converter is converted into direct current and applied to the PWM inverter 2. The carrier wave control circuit 3 is a carrier wave (triangular wave)
The carrier wave center frequency setting circuit 10 outputs a pattern signal such as a sine wave or triangular wave that periodically changes the frequency of the carrier wave, and a carrier wave center frequency setting circuit 10 outputs a constant signal (DC signal) for setting the center frequency of the carrier number. The pattern signal and center frequency setting signal are added and input to the carrier wave generation circuit 4. The added value of the pattern signal and center frequency setting signal becomes the switching frequency of the PWM converter 2, that is, a PWM frequency command that commands the frequency of the PWM signal. The carrier wave generation circuit 4 generates a carrier wave with a frequency according to the input voltage (PWM frequency command), and the carrier wave control circuit 3
A carrier wave whose frequency changes based on the pattern signal from the comparator 5 is output to the comparator 5. Comparator 5 compares the modulated wave generated by output voltage pattern generation circuit 6 and the carrier wave of carrier wave generation circuit 4, and outputs a PWM signal to gate circuit 8. And the gate circuit 8
The PWM inverter 2 is controlled by amplifying the PWM signal. The PWM inverter 2 outputs an AC voltage proportional to the output signal of the output voltage pattern generation circuit 6, and drives the AC motor 7.
このようにしてPWMインバータ２を制御して
交流電動機７を駆動するのであるが、搬送波制御
回路３は搬送波周波数を時間的に変化させてい
る。従つて、PWMインバータ２の出力電圧に含
まれる高調波成分はその周波数が時間的に変化
し、同一周波数の高調波が連続して交流電動機７
に印加されることがなくなる。交流電動機７の発
生する磁気音は搬送波周波数、つまりPWM信号
の周波数を時間的に変化させることにより周波数
分布が分散分布するようになる。このため、磁気
音のピークレベルが減少するため磁気音を低減で
きる。 In this way, the PWM inverter 2 is controlled to drive the AC motor 7, and the carrier wave control circuit 3 changes the carrier wave frequency over time. Therefore, the frequency of the harmonic components included in the output voltage of the PWM inverter 2 changes over time, and harmonics of the same frequency are continuously transmitted to the AC motor 7.
is no longer applied. The frequency distribution of the magnetic sound generated by the AC motor 7 becomes dispersed by temporally changing the carrier frequency, that is, the frequency of the PWM signal. Therefore, the peak level of the magnetic sound is reduced, so that the magnetic sound can be reduced.
以上に説明した如く本発明によればPWMイン
バータの出力電圧を制御するPWM信号の周波数
を時間的に変化させているので機械共振の成長を
抑制でき磁気音を大巾に低減することが可能とな
る。 As explained above, according to the present invention, since the frequency of the PWM signal that controls the output voltage of the PWM inverter is changed over time, it is possible to suppress the growth of mechanical resonance and to significantly reduce magnetic noise. Become.
図面は本発明に係るPWMインバータの一実施
例の構成を示すブロツク図である。
２……インバータ、３……搬送波制御回路、４
……搬送波発生回路、５……比較器、６……出力
電圧パターン発生回路、７……交流電動機、８…
…ゲート回路。
The drawing is a block diagram showing the configuration of an embodiment of a PWM inverter according to the present invention. 2...Inverter, 3...Carrier control circuit, 4
... Carrier wave generation circuit, 5 ... Comparator, 6 ... Output voltage pattern generation circuit, 7 ... AC motor, 8 ...
...Gate circuit.
Claims (1)
タにおいて、前記PWMインバータの出力周波数
が一定であつてもPWM信号の周波数を決定する
搬送波の周波数を時間的に変化させることによつ
て前記PWM信号の周波数を変化させるようにし
たことを特徴とするPWMインバータの制御方
法。 ２ 特許請求の範囲第１項において、前記搬送波
の周波数を周期的に変化させることを特徴とする
PWMインバータの制御方法。 ３ 出力電圧がPWM制御されるPWMインバー
タと、変調波を出力する出力電圧パターン発生手
段と、搬送波を出力する搬送波発生手段と、前記
変調波と搬送波を入力してPWM信号を出力し前
記PWMインバータに加えるPWM信号発生手段
と、前記搬送波周波数を時間的に変化させる搬送
波制御手段とを具備したPWMインバータの制御
装置。 ４ 特許請求の範囲第３項において、前記搬送波
制御手段は前記搬送波の周波数を周期的に変化さ
せることを特徴とするPWMインバータの制御装
置。[Claims] 1. In a PWM inverter whose output voltage is PWM controlled, even if the output frequency of the PWM inverter is constant, the frequency of the carrier wave that determines the frequency of the PWM signal is changed over time. A method for controlling a PWM inverter, characterized in that the frequency of the PWM signal is changed. 2. Claim 1 is characterized in that the frequency of the carrier wave is changed periodically.
How to control PWM inverter. 3. A PWM inverter whose output voltage is PWM controlled, an output voltage pattern generating means that outputs a modulated wave, a carrier wave generating means that outputs a carrier wave, and a PWM inverter that outputs a PWM signal by inputting the modulated wave and carrier wave. A control device for a PWM inverter, comprising: a PWM signal generating means for adding a PWM signal to the carrier wave; and a carrier wave control means for temporally changing the carrier wave frequency. 4. The control device for a PWM inverter according to claim 3, wherein the carrier wave control means periodically changes the frequency of the carrier wave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56186795A JPS5889070A (en) | 1981-11-24 | 1981-11-24 | Pwm inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56186795A JPS5889070A (en) | 1981-11-24 | 1981-11-24 | Pwm inverter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5889070A JPS5889070A (en) | 1983-05-27 |
| JPH0379959B2 true JPH0379959B2 (en) | 1991-12-20 |
Family
ID=16194713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56186795A Granted JPS5889070A (en) | 1981-11-24 | 1981-11-24 | Pwm inverter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5889070A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015162704A1 (en) * | 2014-04-22 | 2015-10-29 | 三菱電機株式会社 | Heat pump device and heat pump system |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02305399A (en) * | 1989-05-19 | 1990-12-18 | Matsushita Electric Ind Co Ltd | Fan device |
| JPH044757A (en) * | 1990-04-19 | 1992-01-09 | Sanyo Electric Co Ltd | Control system of pulse-width modulation inverter |
| JP4946292B2 (en) * | 2006-09-13 | 2012-06-06 | パナソニック株式会社 | Power converter and heat pump device using the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5661699A (en) * | 1979-10-24 | 1981-05-27 | Tokyo Shibaura Electric Co | Nuclear reactor coolant recircuration flow rate control device |
-
1981
- 1981-11-24 JP JP56186795A patent/JPS5889070A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5661699A (en) * | 1979-10-24 | 1981-05-27 | Tokyo Shibaura Electric Co | Nuclear reactor coolant recircuration flow rate control device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015162704A1 (en) * | 2014-04-22 | 2015-10-29 | 三菱電機株式会社 | Heat pump device and heat pump system |
| JPWO2015162704A1 (en) * | 2014-04-22 | 2017-04-13 | 三菱電機株式会社 | Heat pump device and heat pump system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5889070A (en) | 1983-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ATE38598T1 (en) | LOAD STATE CONTROL OF AN INVERTER-POWERED ASYNCHRONOUS MACHINE. | |
| EP1067669B1 (en) | Pulse-width modulation inverter | |
| ATE89962T1 (en) | ALTERNATOR AND CONTROLLER APPLIED TO IT. | |
| JPH09308256A (en) | Pwm inverter apparatus | |
| JPH0379959B2 (en) | ||
| JP2810081B2 (en) | PWM power converter | |
| JP3286046B2 (en) | Power converter control method | |
| US6018224A (en) | Anti-clipping circuit for induction motor drive system | |
| JPS5815492A (en) | Control of pulse width control transducer | |
| JPS6384476U (en) | ||
| US5497313A (en) | Switching method and apparatus for increasing efficiency of an inductive load and switching means supplying the load | |
| JP2551549B2 (en) | Induction motor type electric vehicle controller | |
| JP2670677B2 (en) | Drive power supply for electromagnetic vibrator | |
| JP2734070B2 (en) | Method for reducing audible electromagnetic noise of inverter-driven motor | |
| JP2659365B2 (en) | Control method of pulse width modulation control inverter | |
| KR920008572A (en) | Driving control device of vibrator | |
| JPS637174A (en) | Speed controller for piezoelectric motor | |
| JPS6348195A (en) | Method for suppressing current oscillation of pwm inverter | |
| JPS63110990A (en) | Method of controlling current of voltage type pwm inverter | |
| SU928580A1 (en) | Squirrel cage rotor induction machine control device | |
| JPH0768018B2 (en) | Elevator control equipment | |
| JPH0479788A (en) | Power converter | |
| JP2004080929A (en) | Motor drive control device | |
| JPS61236375A (en) | Inverter | |
| JPS62100311A (en) | Vibration control system for electromagnetic vibration type parts feeder |