テクニカルサポート
発行済み 2026-07-07
簡単な答え:あサーボモーター電源は、モーターのピークおよび連続負荷要求に適合する安定した電圧と十分な電流を供給する必要があります。適切なサイズと安定化された電源がなければ、サーボモーターは、トルク損失、不安定な動き、過熱、または完全なシャットダウンを経験する可能性があります。ほとんどの産業用アプリケーションでは、組み合わせたモーター電流定格より少なくとも 20 ～ 30% 高いヘッドルームを持つリニアまたはスイッチング電源が推奨されます。電源の種類、電圧許容差、リップル制御、および熱管理はすべて、モーション システムの信頼性と生産稼働時間に直接影響します。
01導入
あなたは、サイクルの途中で突然停止した生産ラインの責任者です。のサーボ重要な軸上のモーターが応答を停止し、電源障害を示す唯一のエラー コードが表示されます。モータードライバーを交換し、すべてのケーブルをチェックしても、問題は解決しません。本当の原因は？モーターが最も必要とするときにピーク電流を供給できない、過大な電源または不安定な電源。
このシナリオは、多くの購入者が予想するよりも一般的です。産業用モーションコントロールでは、電源は一般的なコンポーネントとして扱われることが多く、モーターとドライブを選択した後、最後に選択するものとなります。しかし実際には、システムがスムーズに動作するか、負荷がかかったときに予期せぬ障害が発生するかは、電源によって決まります。を調達している場合は、サーボ電源新しいマシンの場合、または既存のユニットを交換する場合、仕様、安全マージン、およびアプリケーション固有の要件を理解することで、コストのかかるダウンタイムを回避し、コンポーネントの故障の繰り返しを回避できます。
02目次
1. 電源の選択がサーボの性能に影響を与える理由
2. 購入前に確認すべき主な仕様
3. サーボシステム用のリニア電源とスイッチング電源
4. 正しい電流と電圧の計算方法
5. サーボ電源を選択する際のよくある間違い
6. サーボ電源に関して購入者からよく寄せられる質問
7. アプリケーションについて長期的なより良い決定を下す
03電源の選択がサーボのパフォーマンスに影響を与える理由
サーボモーターは定負荷装置ではありません。加速、減速、トルク保持中に、消費電流が連続定格の数倍に急増する可能性があります。電源がこれらの過渡要求に応答できない場合、DC バス電圧が低下し、ドライブが不足電圧保護に入り、モーターが突然停止したり発振したりすることがあります。
これは単なる理論的な問題ではありません。多くの実稼働環境では、電源の適合性が低いと次のような問題が発生します。
トルク低減高速移動時
位置誤差精密用途では
ドライブの障害手動リセットが必要なもの
コンデンサの早期劣化ドライブユニット内
電源は事実上、動作システム全体のエネルギー貯蔵庫となります。安定した適切に調整された電源により、ドライブは最小動作電圧を下回ることなく、必要なときにピーク電力を引き出すことができます。
04購入前に確認すべき主な仕様
を評価するとき、サーボ電源、これらのパラメータに注目してください。それぞれの電源が実際の動作条件下でモーターとドライブの組み合わせをサポートできるかどうかを直接判断します。
For most industrial applications, a supply with voltage regulation better than ±2%そしてripple below 100 mV peak-to-peak is considered reliable.
05Linear vs. Switching Power Supplies for Servo Systems
Two main topologies dominate the servo power supply market. Each has strengths and trade-offs depending on the application environment.
Linear power supplies use a transformer and linear regulator to produce a clean DC output. They offer extremely low ripple and excellent transient response, making them suitable for sensitive measurement or precision positioning systems. However, they are heavier, less efficient (typically 40–60%), and generate more heat. For a multi-axis servo system drawing 10A or more, a linear supply can become physically large and require forced air cooling.
Switching power supplies use high-frequency switching to regulate output. They are lighter, more efficient (80–95%), and can deliver higher current in a smaller form factor. Modern switching supplies also include built-in protection features such as overvoltage, overcurrent, and short-circuit protection. The trade-off is higher output ripple and potential electromagnetic interference (EMI). For most factory automation environments, a quality switching servo power supply with proper filtering is the preferred choice.
If your application involves sub-micron positioning or operates near sensitive analog sensors, consider a linear supply or add an output filter to a switching supply.
06How to Calculate the Right Current and Voltage
Calculating the required power supply capacity involves more than adding current ratings from motor nameplates. A practical approach includes three steps.
Step 1: Determine total continuous current.
Sum the continuous current ratings of all drives in the system. Each drive datasheet typically lists a continuous input current rating. Add a safety margin of 20–30% to account for variations in load and temperature.
Step 2: Evaluate peak demand.
Identify the axis with the highest acceleration torque requirement. Multiply its peak current by the number of axes that could accelerate simultaneously. In most systems, only one or two axes accelerate at the same time, but if your motion profile involves simultaneous high-torque moves, account for that.
Step 3: Check voltage requirements.
The power supply voltage must match the drive input range. For low-voltage servos (often used in smaller machinery), 48VDC is common. For higher-power applications, 230VAC or 400VAC three-phase input supplies are typical.
計算例:
If you have three drives, each drawing 5A continuous and 15A peak, and the maximum simultaneous acceleration involves two axes, your target supply should handle at least 18A continuous (3 × 5A × 1.2 safety margin) and 30A peak (2 × 15A). A 48V, 20A continuous, 35A peak supply would be a reasonable choice.
Always verify with the drive manufacturer whether a shared power supply is allowed, as some drives require isolated supplies for safety or performance reasons.
07Common Mistakes When Choosing a Servo Power Supply
Mistake 1: Undersizing for peak current.
Many buyers select a supply based on continuous current only. When the motor accelerates, the supply trips or drops voltage, causing a fault. Always check the peak current rating and duration.
Mistake 2: Ignoring voltage drop from long cables.
If the power supply is mounted far from the drives, voltage drop across the cable can reduce the actual voltage at the drive input. Use thicker gauge wire or add local capacitance near the drives to compensate.
Mistake 3: Using a general-purpose power supply without filtering.
Standard industrial power supplies may have high ripple that interferes with servo drive logic. Choose a supply specifically rated for motion control or add a DC filter.
Mistake 4: Overlooking thermal environment.
Power supplies derate at elevated temperatures. If your control cabinet runs at 50°C, a supply rated for 25°C may only deliver 70% of its rated current. Check the derating curve in the datasheet.
Mistake 5: Assuming regenerative energy is handled.
When a servo decelerates a heavy load, energy flows back into the DC bus. If the power supply cannot absorb or dissipate this energy, the bus voltage rises and triggers an overvoltage fault. Some applications require a regenerative resistor or a power supply with regenerative capability.
08Questions Buyers Often Ask About Servo Power Supplies
Q: Can I use a computer power supply for a servo motor?
Not typically. Computer power supplies are designed for constant low-current loads and have poor peak current capability. They also lack the voltage regulation and protection features required for motion control.
Q: What happens if the power supply voltage is too high?
Exceeding the drive input voltage range can damage the drive's internal components, especially the DC bus capacitors and power transistors. Always stay within the specified range.
Q: Do I need a regulated power supply?
Yes. Unregulated supplies produce voltage that varies with load and input line changes. Servo drives require a stable DC bus to maintain consistent torque and position control.
Q: How do I know if my power supply is causing servo issues?
Monitor the DC bus voltage on the drive display or software. If the voltage drops more than 5% during acceleration, the supply is likely undersized or has high internal resistance.
Q: Can I connect multiple drives to one power supply?
Yes, as long as the total current and peak demand are within the supply's ratings. Ensure each drive has local decoupling capacitors as recommended by the manufacturer.
Q: What is the typical lifespan of a servo power supply?
With proper ventilation and operation within rated conditions, a quality switching power supply can last 5–10 years. Electrolytic capacitors are the most common failure point and degrade faster in high-temperature environments.
Q: Should I choose a power supply with built-in regenerative capability?
If your application involves frequent high-speed deceleration or vertical loads, regenerative capability is important. Otherwise, a standard supply with an external regenerative resistor is sufficient.
Q: What is the difference between constant voltage and constant current power supplies?
Servo drives require constant voltage. Constant current supplies are used for applications like LED lighting or battery charging and are not suitable for servo systems.
09Making a Better Long-Term Decision for Your Application
Selecting a servo power supply is not simply about matching voltage and current numbers. The supply must support the dynamic energy demands of your motion profile, operate reliably in your thermal environment, and provide protection against faults that could damage expensive drives and motors.
Start by documenting the worst-case current draw for each axis, including acceleration and deceleration phases. Add margin for future expansion or load changes. Choose a supply from a manufacturer with documented specifications, derating curves, and protection features. If your system requires compliance with CE, UL, or other safety standards, verify that the supply carries appropriate certifications.
For applications where uptime is critical, consider a power supply with redundant input capability or a modular design that allows hot-swap replacement. In high-precision environments, prioritize low ripple and tight regulation. In high-throughput production, prioritize peak current capacity and thermal management.
If you are evaluating a サーボ電源 for a new machine or retrofit project, キロパワーサーボ offers a range of power supplies designed for motion control applications. Their engineering team can review your system specifications and recommend a supply that matches your voltage, current, and environmental requirements. Contact their technical support to discuss your application and request a detailed specification sheet before ordering.
A well-chosen power supply does not just power your motors — it protects your investment in the entire motion system. Take the time to evaluate the specs, consider the real operating conditions, and choose a supply that delivers consistent performance over the long term.
Update Time：2026-07-07
