so that, such that：目的、結果、態様

制御装置は、第１回転軸の回転速度が目標回転速度よりも速くなるようにモータを制御する。

ChatGPT:

こちらの文の自然で技術的に適切な英訳は、次のようになります：

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"The control device controls the motor such that the rotational speed of the first rotary shaft becomes higher than a target rotational speed."

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別の自然な言い回し（やや簡潔）：

"The control device controls the motor to make the rotational speed of the first rotary shaft exceed the target rotational speed."

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用語の選定について：

• 制御装置 → control device（一般的な技術英語。用途により controller も可）

• 回転速度 → rotational speed

• 目標回転速度 → target rotational speed

• よりも速くなるように → becomes higher than / exceeds

「exceed」は特許クレームや仕様書でよく使われる表現で、簡潔かつ明確です。

ご希望があれば、"rotating shaft" バージョンや、クレーム文調の調整もできますよ。

あなた:

Why "such that" and not "so that"?

ChatGPT:

Excellent question — the difference between "such that" and "so that" is subtle but important, especially in technical or formal writing, such as patents or engineering documents.

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🔍 Basic distinction:

Phrase	Usage	Tone	Example
so that	Indicates purpose or intention	Conversational / General	He slowed down so that the others could catch up.
such that	Indicates a condition or result that satisfies a specification	Formal / Technical	Control is performed such that the voltage remains constant.

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💡 In your sentence:

"The control device controls the motor ___ the rotational speed of the first rotary shaft exceeds the target rotational speed."

✅ Why "such that" fits best:

• This sentence is not describing why the motor is being controlled (purpose), but what condition the control is intended to achieve.

• It’s specifying a technical result or constraint — common in engineering specs and patents.

• It sounds precise, measured, and objective — ideal for technical contexts.

So:

"The control device controls the motor such that the rotational speed... "
✅ → sounds like "in a manner that results in..." — very standard in control system descriptions.

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🚫 Why "so that" is less suitable here:

• Implies intention or goal, and is more casual.

• Would sound more natural in a general-purpose or instructional sentence, like:

  "He turned the knob so that the fan would stop."

But in technical writing, "so that" can feel out of place or too purpose-driven when you're describing system behavior or logic.

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🧪 Real-world usage examples (from technical papers/patents):

• "The controller adjusts the voltage such that the output current remains stable."

• "The motor is driven such that the tape feed speed matches the print speed."

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So, in short:
✅ "such that" is formal, technical, and describes a resulting condition.
⚠️ "so that" is informal, intention-driven, and better suited to general prose.

Would you like examples where "so that" would be better?

あなた:

So, "such that" can be paraphrased by "in such a manner that" and "so that" by "in order to bring about the result that"?

ChatGPT:

Exactly! You've captured the distinction perfectly. Here's a clearer side-by-side to reinforce that:

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✅ "such that"

→ Can be paraphrased as:

"in such a manner that", or
"in a way that results in..."

It expresses a condition, configuration, or outcome, especially in technical or logical descriptions.

🔧 Example:

The control device adjusts the current such that the voltage remains constant.
→ "...in such a manner that the voltage remains constant."

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✅ "so that"

→ Can be paraphrased as:

"in order to bring about the result that", or
"with the purpose of"

It expresses intent, purpose, or desired effect, and is more common in general or procedural writing.

🧪 Example:

He set the timer so that the machine would stop automatically.
→ "...in order to bring about the result that the machine would stop."

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Summary Table:

Expression	Paraphrase	Usage Context
such that	in such a manner that	Technical, formal, describes outcome/result
so that	in order to bring about the result that	General, procedural, implies intent or goal

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You're thinking about this distinction in exactly the right way. Want to test a few example sentences together?