JP3588499B2 - Method and apparatus for detecting failure of winding type rotation detector - Google Patents

Description

但し、Ｋ：巻線の変圧比
Ｅ：入力電圧
ω：２πｆ（ｆは励磁周波数）
ｔ：時間
θ：回転角
さらに、前記和の最大値は、ｓｉｎ ωｔ＝１の時で、その最大値はＫ^２Ｅ^２となる。この最大値Ｋ^２Ｅ^２は前述のように変圧比と入力電圧よりなるもので、回転角θに依存するものではない。従って、この最大値Ｋ^２Ｅ^２の変動を予め設定した設定値と比較することにより、１次側ロータトランス、１次側ロータコイル、２次側ステータコイルの故障（レアショート、絶縁不良等）を検出することができる。
【０００８】
【実施例】
以下、図面と共に本発明による巻線型回転検出器の故障検出方法及び装置の好適な実施例について詳細に説明する。
図１は、巻線型回転検出器としてのレゾルバ（シンクロの場合もある）の巻線構造を示す結線図であり、この図１において符号１で示されるものはトランス入力巻線２とトランス出力巻線３からなる１次ロータトランスであり、このトランス出力巻線３には２相状の１次ロータ巻線４が接続されている。
【０００９】
前記ロータ巻線４に対応して２相状の２次ステータ巻線５（２相の巻線出力部をなす）が固定して配設されている。前記トランス入力巻線２には、励磁信号Ｅ ｓｉｎ ωｔが印加され、２次ステータ巻線５の各出力端５ａ，５ｂからは２相出力信号ＫＥ ｓｉｎ ωｔ・ｓｉｎ θ，ＫＥ ｓｉｎ ωｔ・ｃｏｓ θが出力される。なお、この場合、２次ステータ巻線５側から２相出力信号を得ているが、逆の構成としてロータ巻線側からロータトランスを介して２相出力を得るようにすることもできる。
【００１０】
次に、前記２相出力信号ＫＥ ｓｉｎ ωｔ・ｃｏｓ θ，ＫＥ ｓｉｎ ωｔ・ｓｉｎ θは、第１、第２乗算器１０，１１で各々個別に乗算処理され、各乗算器１０，１１からの乗算出力１０ａ，１１ａが加算器１２で加算される。この加算器１２で加算された加算出力１２ａは、その最大値検出回路１３にて検出されるように構成されており、この最大値検出回路１３で検出された最大値１３ａは最大値レベル判定回路１４にて判定され、その判定結果により前記最大値レベル判定回路１４から故障信号１５が出力されるように構成されている。
【００１１】
次に、動作について述べる。まず、前記２相出力信号ＫＥ ｓｉｎ ωｔ・ｃｏｓ θ，ＫＥ ｓｉｎ ωｔ・ｓｉｎ θを各々乗算器１０，１１で乗算し、その和を求めると、次式の通りとなる。

但し、Ｋ：巻線の変圧比
Ｅ：入力電圧
ω：２πｆ（ｆは励磁周波数）
ｔ：時間
θ：回転角
さらに、前記和の最大値は、ｓｉｎ ωｔ＝１の時で、その最大値はＫ^２Ｅ^２となる。この最大値Ｋ^２Ｅ^２は前述のように変圧比と入力電圧よりなるもので、回転角θに依存するものではない。従って、この最大値Ｋ^２Ｅ^２の変動を予め設定した設定値と比較することにより、１次側ロータトランス、１次側ロータコイル、２次側ステータコイルの故障（レアショート、絶縁不良等）を検出することができ、故障信号１５を出力することができる。
なお、故障検出は、回転検出器が非回転の停止している時でも故障検出が可能であり、かつ、この励磁信号Ｅ ｓｉｎ ωｔ の励磁周波数の周期（高速）で故障検出が可能である。
【００１２】
【発明の効果】
本発明による巻線型回転検出器の故障検出方法及び装置は、以上のように構成されているため、次のような効果を得ることができる。
すなわち、２相出力信号を各々乗算し、各乗算出力の最大値を用いて故障を検出しているため、従来のような巻線の断線検出のみではなく、巻線のレアショートの検出が可能であり、例えば、自動車、電車等の車輌用電動機の制御装置の速度及び位置精度を大幅に向上させることができる。
【図面の簡単な説明】
【図１】本発明による巻線型回転検出器の故障検出装置に用いる巻線型回転検出器を示す結線図である。
【図２】故障検出装置を示すブロック図である。
【符号の説明】
５ 巻線出力部
ＫＥ ｓｉｎ ωｔ・ｃｏｓ θ，ＫＥ ｓｉｎ ωｔ・ｓｉｎ θ ２相出力信号
１０，１１ 第１、第２乗算器
１０ａ，１１ａ 乗算出力
１２ 加算器
１２ａ 加算出力
１３ 最大値検出回路
１３ａ 最大値
１４ 最大値レベル判定回路
１５ 故障信号[0001]
[Industrial applications]
The present invention relates to a failure detection device for a winding type rotation detector, and more particularly to a novel improvement for reliably detecting a failure such as disconnection of a winding of a resolver or the like and a rare short circuit.
[0002]
[Prior art]
Conventionally, as a failure detection device for this type of winding type rotation detector that has been used, generally, only detection of the presence or absence of conduction for detecting disconnection of a winding is performed.
[0003]
[Problems to be solved by the invention]
Since the conventional failure detection device for the wound type rotation detector is configured as described above, the following problems exist.
That is, in the conventional configuration, since only the disconnection detection is performed, it is impossible to detect a failure other than the disconnection such as a rare short of the winding, and the accuracy of the output signal is adversely affected.
[0004]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in particular, failure detection of a winding type rotation detector that reliably detects a failure such as disconnection of a winding of a resolver or the like and a rare short circuit. It is intended to provide a device.
[0005]
[Means for Solving the Problems]
The fault detection device of the winding type rotation detector according to the present invention obtains each multiplied output by multiplying each of the two-phase output signals obtained from the two-phase winding output section, and adds each of the multiplied outputs. And detecting a maximum value of the added output and outputting a failure signal based on the maximum value.
[0006]
A fault detection device for a winding type rotation detector according to the present invention includes first and second multipliers for respectively multiplying a two-phase output signal obtained from a two-phase winding output unit, and a signal from each of the multipliers. An adder for adding each multiplied output, a maximum value detection circuit connected to the adder for detecting the maximum value of the addition output from the adder, and the maximum value connected to the maximum value detection circuit And a maximum value level determination circuit for performing the level determination of the above, and a failure signal is output from the maximum value level determination circuit.
[0007]
[Action]
In the method and the apparatus for detecting a failure of a wound-type rotation detector according to the present invention, two-phase output signals obtained from two-phase winding output portions of a resolver, which is a wound-type rotation detector, are respectively multiplied to obtain a sum thereof. Then, the following equation is obtained.

Here, K: transformation ratio of winding E: input voltage ω: 2πf (f is excitation frequency)
t: time θ: rotation angle Further, the maximum value of the sum is at the time of sin ωt = 1, and the maximum value is K ² E ² . The maximum value K ² E ² is composed of the transformation ratio and the input voltage as described above, and does not depend on the rotation angle θ. Therefore, by comparing the variation of the maximum value K ² E ² with a preset value, failure of the primary-side rotor transformer, the primary-side rotor coil, and the secondary-side stator coil (rare short, insulation failure, etc.) Can be detected.
[0008]
【Example】
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method and an apparatus for detecting a failure of a winding type rotation detector according to the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a connection diagram showing a winding structure of a resolver (which may be a synchro) as a winding-type rotation detector. In FIG. 1, what is indicated by reference numeral 1 is a transformer input winding 2 and a transformer output winding. A primary rotor transformer composed of a wire 3, and a two-phase primary rotor winding 4 is connected to the transformer output winding 3.
[0009]
A two-phase secondary stator winding 5 (forming a two-phase winding output unit) is fixedly arranged corresponding to the rotor winding 4. An excitation signal E sin ωt is applied to the transformer input winding 2, and two-phase output signals KE sin ωt · sin θ and KE sin ωt · cos θ are output from the output terminals 5 a and 5 b of the secondary stator winding 5. Is output. In this case, a two-phase output signal is obtained from the secondary stator winding 5 side, but a two-phase output may be obtained from the rotor winding side via a rotor transformer as a reverse configuration.
[0010]
Next, the two-phase output signals KE sin ωt · cos θ and KE sin ωt · sin θ are individually multiplied by first and second multipliers 10 and 11, respectively, and the multiplications from the respective multipliers 10 and 11 are performed. The outputs 10a and 11a are added by the adder 12. The addition output 12a added by the adder 12 is configured to be detected by a maximum value detection circuit 13, and the maximum value 13a detected by the maximum value detection circuit 13 is determined by a maximum value level determination circuit. The maximum value level determination circuit 14 is configured to output a failure signal 15 based on the determination result.
[0011]
Next, the operation will be described. First, the two-phase output signals KE sin ωt · cos θ and KE sin ωt · sin θ are multiplied by multipliers 10 and 11, respectively, and the sum is obtained as follows.

Here, K: transformation ratio of winding E: input voltage ω: 2πf (f is excitation frequency)
t: time θ: rotation angle Further, the maximum value of the sum is at the time of sin ωt = 1, and the maximum value is K ² E ² . The maximum value K ² E ² is composed of the transformation ratio and the input voltage as described above, and does not depend on the rotation angle θ. Therefore, by comparing the variation of the maximum value K ² E ² with a preset value, failure of the primary-side rotor transformer, the primary-side rotor coil, and the secondary-side stator coil (rare short, insulation failure, etc.) Can be detected, and the failure signal 15 can be output.
Note that the failure detection can be performed even when the rotation detector is not rotating and stopped, and the failure can be detected at the cycle (high speed) of the excitation frequency of the excitation signal E sin ωt.
[0012]
【The invention's effect】
The method and the apparatus for detecting a failure of the winding type rotation detector according to the present invention are configured as described above, and therefore, the following effects can be obtained.
In other words, since the fault is detected by multiplying the two-phase output signals and using the maximum value of each multiplied output, it is possible to detect not only the disconnection of the winding but also the rare short of the winding as in the conventional case. For example, the speed and position accuracy of a control device for a motor for a vehicle such as an automobile and a train can be greatly improved.
[Brief description of the drawings]
FIG. 1 is a connection diagram showing a winding type rotation detector used in a failure detection device for a winding type rotation detector according to the present invention.
FIG. 2 is a block diagram illustrating a failure detection device.
[Explanation of symbols]
5 Winding output section KE sin ωt · cos θ, KE sin ωt · sin θ Two-phase output signal 10, 11 First and second multipliers 10a, 11a Multiplied output 12 Adder 12a Added output 13 Maximum value detection circuit 13a Maximum Value 14 Maximum value level judgment circuit 15 Failure signal

Claims (2)

The two-phase output signals (KE sin ωt · cos θ, KE sin ωt · sin θ) obtained from the two-phase winding output unit (5) are respectively multiplied to obtain multiplied outputs (10a, 11a). A maximum value (13a) of an addition output (12a) obtained by adding the respective multiplication outputs (10a, 11a) is detected, and a failure signal (15) is output based on the maximum value (13a). A failure detection method for a winding type rotation detector. First and second multipliers (10, 11) for respectively multiplying the two-phase output signals (KE sin ωt · cos θ, KE sin ωt · sin θ) obtained from the two-phase winding output unit (5). ), An adder (12) for adding the multiplied outputs (10a, 11a) from the multipliers (10, 11), and an adder (12) connected to the adder (12). A maximum value detection circuit (13) for detecting a maximum value (13a) of an addition output (12a) of the above, and a level detection circuit connected to the maximum value detection circuit (13) for determining the level of the maximum value (13a) A failure detection device for a winding type rotation detector, comprising a maximum value level determination circuit (14), and configured to output a failure signal (15) from the maximum value level determination circuit (14).

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