JPH01234085A - Motor driving equipment - Google Patents

Motor driving equipment

Info

Publication number
JPH01234085A
JPH01234085A JP63059706A JP5970688A JPH01234085A JP H01234085 A JPH01234085 A JP H01234085A JP 63059706 A JP63059706 A JP 63059706A JP 5970688 A JP5970688 A JP 5970688A JP H01234085 A JPH01234085 A JP H01234085A
Authority
JP
Japan
Prior art keywords
motor
circuit
command signal
signal
current
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.)
Pending
Application number
JP63059706A
Other languages
Japanese (ja)
Inventor
Susumu Yamamoto
進 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP63059706A priority Critical patent/JPH01234085A/en
Publication of JPH01234085A publication Critical patent/JPH01234085A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To enable highly accurate setting of current modulation rate for a motor, by modulating a torque command signal corresponding to a position signal and adding or subtracting the modulated signal and the torque command signal through a plurality of resist means, thereafter controlling the current to be fed to the motor based on a signal obtained through the resist means. CONSTITUTION:A command signal generation circuit 1 outputs a torque command signal io for a motor. A current mirror circuit comprising transistors 2, 3 attenuates the torque command signal io by the amount of mirror ratio. A modulation circuit 4 modulates the output from the current mirror circuit based on the position signal of the motor. The torque command signal io and an output signal ir from the modulation circuit 4 are fed to resistors 5, 6. Voltage produced at the joint between the modulation circuit 4 and the resistor 5 is fed to a motor 8. By such arrangement, modulation rate of current to be fed to the motor can be set with high accuracy.

Description

【発明の詳細な説明】 産業上の利用分野 本発明はモータの駆動装置に関するものである。[Detailed description of the invention] Industrial applications The present invention relates to a motor drive device.

従来の技術 近年、映像、音響等の機器において、磁気テープ等の記
録媒体を移動させる手段としてのモータの回転むらを少
なくするため、その原因となるトルクリップルを抑制す
ることが、機器の性能を向上するうえで、重要な課題に
なっている。トルクリップルの抑制に関しては、従来よ
り様々な試みがなされており、たとえば、特開昭59−
35685号公報には、その代表的な技術が開示され、
その動作のポイントは、位置信号よりモータの回転に同
期した変調信号を合成し、この変調信号に応動して、モ
ータへの供給電流を変調し、モータのトルク定数と逆相
の波形にすることにより、トルクリップルを抑制するこ
とにある。また、特開昭6に150695号公報にも、
変調信号の合成の方法は異なるが、原理的には同様な技
術が示されている。
2. Description of the Related Art In recent years, in order to reduce uneven rotation of the motor used to move recording media such as magnetic tape in video and audio equipment, it has become important to suppress the torque ripple that causes this to improve the performance of the equipment. This is an important issue for improvement. Regarding the suppression of torque ripple, various attempts have been made in the past, for example,
Publication No. 35685 discloses a typical technique thereof,
The key to its operation is to synthesize a modulation signal synchronized with the rotation of the motor from a position signal, and in response to this modulation signal, modulate the current supplied to the motor to create a waveform that is in reverse phase with the motor's torque constant. The purpose is to suppress torque ripple. Also, in Japanese Unexamined Patent Publication No. 150695,
Although the method of combining modulated signals is different, techniques that are similar in principle have been shown.

これらの技術で最も重要なことは、モータへの供給電流
に変調信号をどれだけ含ませるか、即ち変調率をいくら
にするかである。トルクリップルが最小になる最適の変
調率は、モータのマグネットの着磁パターンやコイルの
形状等により異なるため、モータごとに最適な値に設定
する必要があり、また、変調率の設定は精度良く行う必
要がある。
The most important thing in these techniques is how much modulation signal to include in the current supplied to the motor, that is, what the modulation rate should be. The optimal modulation rate that minimizes torque ripple varies depending on the magnetization pattern of the motor's magnets, the shape of the coil, etc., so it is necessary to set the optimal value for each motor, and the modulation rate must be set accurately. There is a need to do.

この変調率の設定には、第3図に示すカレントミラーを
用いた回路が用いられる。図において、1はモータのト
ルク指令信号を発生する指令信号発生回路、2.3はカ
レントミラーを構成するトランジスタ、4は変調回路、
6は抵抗、7は電力増幅器、8はモータ、9は合成信号
発生回路である。この回路の動作を簡単に説明するき、
トルク指令は指令信号発生回路1により電流出力され、
その一つの出力は抵抗6に流入し、もう一方は一対のト
ランジスタ2.3からなるカレントミラーによりミラー
比だけ減衰されたあと、変調回路4を通り抵抗6に流入
する。変調回路4は位置信号によりカレントミラーの出
力を変調する回路であり、トルクリップルを抑制するた
めの信号を出力する。モータには抵抗6に発生した電圧
に応じた電流が電力増幅器7により供給される。このよ
うにしてトルク指令信号にある一定量だけ変調信号を含
んだ電流をモータに供給しているが、変調信号が含まれ
る割合、即ち変調率はカレントミラーのミラー比で決ま
るため、変調率の温度変化が少ない回路を実現できる。
To set this modulation rate, a circuit using a current mirror shown in FIG. 3 is used. In the figure, 1 is a command signal generation circuit that generates a motor torque command signal, 2 and 3 are transistors forming a current mirror, 4 is a modulation circuit,
6 is a resistor, 7 is a power amplifier, 8 is a motor, and 9 is a composite signal generation circuit. To briefly explain the operation of this circuit,
The torque command is output as a current by the command signal generation circuit 1,
One output flows into the resistor 6, and the other output passes through the modulation circuit 4 and flows into the resistor 6 after being attenuated by the mirror ratio by a current mirror consisting of a pair of transistors 2.3. The modulation circuit 4 is a circuit that modulates the output of the current mirror using a position signal, and outputs a signal for suppressing torque ripple. A current corresponding to the voltage generated across the resistor 6 is supplied to the motor by a power amplifier 7. In this way, a current containing a certain amount of modulation signal in the torque command signal is supplied to the motor, but the ratio of modulation signal included, that is, the modulation rate, is determined by the mirror ratio of the current mirror, so the modulation rate is A circuit with little temperature change can be realized.

発明が解決しようとする課題 しかしながら、第3図に示す回路では、カレントミラー
のミラー比を任意の値に精度良く設定するのが困難なう
え、集積回路では、変調率を変更するのにカレントミラ
ーを構成するトランジスタのトランジスタサイズの変更
が必要になるため、変更するマスクの枚数が多いという
問題点を有していた。
Problems to be Solved by the Invention However, in the circuit shown in FIG. 3, it is difficult to accurately set the mirror ratio of the current mirror to an arbitrary value. Since it is necessary to change the size of the transistors constituting the transistor, there is a problem in that the number of masks to be changed is large.

本発明は、上記間組点に鑑み、モータへの供給電流の変
調率を精度良く設定でき、かつ、変調率の変更が容易で
あるモータ駆動装置を提供するものである。
In view of the above-mentioned interpolation points, the present invention provides a motor drive device in which the modulation rate of the current supplied to the motor can be set with high accuracy and the modulation rate can be easily changed.

課題を解決するための手段 上記問題点を解決するために、本発明のモータ駆動装置
は、モータのトルク指令信号を発生する指令信号発生回
路、位置信号より合成された信号を発生する第1の合成
信号発生回路、前記指令信号発生回路の出力と前記第1
の合成信号発生回路の出力とを合成した信号を発生する
第2の合成信号発生回路および前記指令信号発生回路の
出力と前記第2の合成信号発生回路の出力とを適当な比
で加算または減算させる複数個の抵抗手段を具備し、前
記抵抗手段で得られた信号により前記モータに供給する
電流を制御する構成になっている。
Means for Solving the Problems In order to solve the above problems, the motor drive device of the present invention includes a command signal generation circuit that generates a motor torque command signal, and a first circuit that generates a signal synthesized from position signals. a composite signal generation circuit, an output of the command signal generation circuit and the first
a second composite signal generating circuit that generates a signal obtained by combining the output of the composite signal generating circuit; and adding or subtracting the output of the command signal generating circuit and the output of the second composite signal generating circuit in an appropriate ratio. The electric current supplied to the motor is controlled by a signal obtained by the resistance means.

作用 本発明によると、モータへの供給電流を位置信号に同期
させて変調し、トルクリップルを抑制する場合に、その
変調率を任意の値に精度良く設定できる。
According to the present invention, when the current supplied to the motor is modulated in synchronization with a position signal to suppress torque ripple, the modulation rate can be set to an arbitrary value with high precision.

実施例 第1図は本発明の一実施例モータ駆動装置の回路構成図
を示したものである。図において、1はモータのトルク
指令信号を発生する指令信号発生回路、2,3はカレン
トミラーを構成するトランジスタ、4は入力された電流
を変調する変調回路、5.6は変調率を設定する抵抗、
7は電力増幅器、8はモータ、9は位置信号より合成さ
れた信号を発生する合成信号発生回路である。
Embodiment FIG. 1 shows a circuit diagram of a motor drive device according to an embodiment of the present invention. In the figure, 1 is a command signal generation circuit that generates a motor torque command signal, 2 and 3 are transistors forming a current mirror, 4 is a modulation circuit that modulates the input current, and 5.6 is a modulation rate setting circuit. resistance,
7 is a power amplifier, 8 is a motor, and 9 is a composite signal generation circuit that generates a composite signal from position signals.

このモータ駆動装置について、その動作を図を用いて説
明する。第2図(a)〜(e)はモータの回転子の回転
角度θを電気角で表わして、トルク定数、各部の波形、
モータの発生トルクを表わした信号波形図であり、(a
)はモータ8のトルク定数、(b)は指令信号発生回路
1の出力電流i。の波形、(C)は変調回路4の出力電
流i、の波形、(d)は変調回路4と抵抗5の接続点に
発生する電圧、(e)は発生トルクである。指令信号発
生回路1からは二つの電流出力が出力され、一方は抵抗
6に流入する。もう−方の出力は、カレントミラーによ
り大きさが1/nにされたあと(1/nはカレントミラ
ーのミラー比)、変調回路4により、モータの回転に同
期したトルク定数の波形と逆相の波形になり、抵抗5.
6に流入する。モータ8には、変調回路4と抵抗5との
接続点に発生する電圧の波形と同じ波形の電流が流れる
。これにより、トルク定数とモー夕への供給電流との積
であるトルクは、図のようにリップルの少ないものにす
ることができる。トルクリップルを最小にするには、第
2図(a)の波形図中に示したトルク定数の変調率b 
/ aと第2図(d)の波形図中に示したモータの電流
の変調率d / cを等しくする必要がある。本実施例
では、変調率b / aはカレントミラーのミラー比1
 / nと抵抗5.6によりきまり、抵抗5.6の値を
それぞれR5,Rsとすれば、d/c −(R5+Rs
)/nRsとなる。一般にカレントミラーのミラー比は
、任意の値に精度良く設定するのは困難であるが、整数
分の1であれば精度良く設定できる。本実施例によれば
、カレントミラーのミラー比を目標の値より低めで整数
分の1の値に精度良く設定し、抵抗5.6の値で調節す
ることにより、任意の値に精度良く設定でき、しかも、
変調率の変更も抵抗5.6の値により容易に行うことが
できる。
The operation of this motor drive device will be explained with reference to the drawings. Figures 2 (a) to (e) show the rotation angle θ of the motor rotor in electrical degrees, the torque constant, the waveforms of each part,
It is a signal waveform diagram showing the torque generated by the motor, and (a
) is the torque constant of the motor 8, and (b) is the output current i of the command signal generation circuit 1. (C) is the waveform of the output current i of the modulation circuit 4, (d) is the voltage generated at the connection point between the modulation circuit 4 and the resistor 5, and (e) is the generated torque. Two current outputs are output from the command signal generation circuit 1, one of which flows into the resistor 6. After the size of the other output is reduced to 1/n by the current mirror (1/n is the mirror ratio of the current mirror), the output is generated by the modulation circuit 4 in a phase opposite to the torque constant waveform synchronized with the rotation of the motor. The waveform becomes 5.
6. A current having the same waveform as the voltage generated at the connection point between the modulation circuit 4 and the resistor 5 flows through the motor 8 . As a result, the torque, which is the product of the torque constant and the current supplied to the motor, can be made to have less ripple as shown in the figure. In order to minimize the torque ripple, the modulation rate b of the torque constant shown in the waveform diagram of Fig. 2 (a) is
/a and the motor current modulation rate d/c shown in the waveform diagram of FIG. 2(d) must be made equal. In this example, the modulation rate b/a is the mirror ratio of the current mirror 1
/ n and resistance 5.6, and if the values of resistance 5.6 are R5 and Rs, respectively, then d/c - (R5 + Rs
)/nRs. Generally, it is difficult to set the mirror ratio of a current mirror to an arbitrary value with high precision, but it can be set with high precision if it is a fraction of an integer. According to this embodiment, the mirror ratio of the current mirror is accurately set to a value that is lower than the target value and is a fraction of an integer, and by adjusting the value of the resistor 5.6, it can be accurately set to an arbitrary value. It is possible, and
The modulation rate can also be easily changed by changing the value of the resistor 5.6.

発明の効果 以上のように本発明によれば、モータのトルク指令信号
を発生ずる指令信号発生回路と、位置信号より合成され
た信号を発生する第1の合成信号発生回路と、前記指令
信号発生回路の出力と前記第1の合成信号発生回路の出
力とを合成した信号を発生する第2の合成信号発生回路
と、前記指令信号発生回路の出力と前記第2の合成信号
発生回路の出力とを適当な比で加算または減算させる複
数個の抵抗手段を具備し、前記抵抗手段で得られた信号
によりモータに供給する電流を制御することにより、モ
ータへ供給する電流の変調率を精度良く設定でき、かつ
、変更も容易なモータ駆動装置が実現可能である。
Effects of the Invention As described above, according to the present invention, there is provided a command signal generation circuit that generates a motor torque command signal, a first composite signal generation circuit that generates a signal synthesized from position signals, and a first composite signal generation circuit that generates a signal synthesized from position signals. a second composite signal generating circuit that generates a signal obtained by combining the output of the circuit and the output of the first composite signal generating circuit; an output of the command signal generating circuit and an output of the second composite signal generating circuit; The modulation rate of the current supplied to the motor is set with high precision by comprising a plurality of resistance means for adding or subtracting the values at an appropriate ratio, and controlling the current supplied to the motor using the signal obtained by the resistance means. It is possible to realize a motor drive device that can be easily modified.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の実施例のモータ駆動装置の回路構成図
、第2図は同実施例装置の動作を説明するための信号波
形図、第3図は従来例のモータ駆動装置の回路構成図で
ある。 1・・・・・・指令信号発生回路、2,3・・・・・・
カレントミラーを構成するトランジスタ、4・・・・・
・変調回路、5,6・・・・・・抵抗、7・・・・・・
電力増幅器、8・・・・・・モータ、9・・・・・・合
成信号発生回路。 /−指令信号発生回路 ?、3一方レントしラーと眉1戊するトランジスタ4−
変調回路 、5.6・−招看九 7− 電力上首幅暴 8− 七−り 9−−− /#六区名芳を生回路 第 1 図 厖 2 図 0660’    120”    lBo”    
240   31)t)’    Jb。
FIG. 1 is a circuit configuration diagram of a motor drive device according to an embodiment of the present invention, FIG. 2 is a signal waveform diagram for explaining the operation of the same embodiment device, and FIG. 3 is a circuit configuration diagram of a conventional motor drive device. It is a diagram. 1... Command signal generation circuit, 2, 3...
Transistors forming the current mirror, 4...
・Modulation circuit, 5, 6... Resistor, 7...
Power amplifier, 8...Motor, 9...Synthetic signal generation circuit. /-Command signal generation circuit? , 3 On the other hand, the transistor 4-
Modulation circuit, 5.6.
240 31)t)' Jb.

Claims (1)

【特許請求の範囲】[Claims] モータのトルク指令信号を発生する指令信号発生回路、
複数個の位置信号より合成された信号を発生する第1の
合成信号発生回路、前記指令信号発生回路の出力と前記
第1の合成信号発生回路の出力とを合成した信号を発生
する第2の合成信号発生回路および前記指令信号発生回
路の出力と前記第2の合成信号発生回路の出力とを適当
な比で加算または減算させる複数個の抵抗手段を具備し
、前記抵抗手段で得られた信号により前記モータに供給
する電流を制御することを特徴とするモータ駆動装置。
a command signal generation circuit that generates a motor torque command signal;
a first composite signal generation circuit that generates a signal synthesized from a plurality of position signals; and a second composite signal generation circuit that generates a signal that synthesizes the output of the command signal generation circuit and the output of the first composite signal generation circuit. A composite signal generating circuit and a plurality of resistor means for adding or subtracting the output of the command signal generating circuit and the output of the second composite signal generating circuit at an appropriate ratio are provided, and the signal obtained by the resistor means A motor drive device, characterized in that the current supplied to the motor is controlled by:
JP63059706A 1988-03-14 1988-03-14 Motor driving equipment Pending JPH01234085A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63059706A JPH01234085A (en) 1988-03-14 1988-03-14 Motor driving equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63059706A JPH01234085A (en) 1988-03-14 1988-03-14 Motor driving equipment

Publications (1)

Publication Number Publication Date
JPH01234085A true JPH01234085A (en) 1989-09-19

Family

ID=13120926

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63059706A Pending JPH01234085A (en) 1988-03-14 1988-03-14 Motor driving equipment

Country Status (1)

Country Link
JP (1) JPH01234085A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5935585A (en) * 1982-08-24 1984-02-27 Matsushita Electric Ind Co Ltd Drive circuit for motor
JPS61150695A (en) * 1984-12-25 1986-07-09 Matsushita Electric Ind Co Ltd Drive device of dc commutatorless motor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5935585A (en) * 1982-08-24 1984-02-27 Matsushita Electric Ind Co Ltd Drive circuit for motor
JPS61150695A (en) * 1984-12-25 1986-07-09 Matsushita Electric Ind Co Ltd Drive device of dc commutatorless motor

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