Dynamic Braking vs Regenerative Braking – What’s the Difference?
When a motor decelerates under the control of a VFD (variable frequency drive), it doesn’t just stop—it generates energy. That energy has to go somewhere. If it’s not managed properly, your drive may trigger overvoltage faults or even suffer permanent damage. The two most common solutions? Dynamic braking and regenerative braking.
In this article, we explain the differences between the two, when to use each, and how to size your braking system correctly.
⚙️ What Is Dynamic Braking?
Dynamic braking works by redirecting excess motor energy into a braking resistor. The resistor converts the energy into heat, which is then dissipated safely. This method is simple, cost-effective, and widely used across general-purpose VFDs.
- ✅ Requires a resistor (external or integrated)
- ✅ Ideal for simple stop/start applications
- ✅ No energy recovery—wasted as heat
➡️ Try our Braking Resistor Calculator to size your system correctly.
🔁 What Is Regenerative Braking?
Regenerative braking, also called “regen braking,” sends excess motor energy back into the power supply or grid. This requires a VFD with built-in regenerative functionality or a separate regen unit.
- ⚡ Converts braking energy into reusable power
- 💸 Higher upfront cost, but long-term energy savings
- 🔧 Often used in lifts, cranes, test benches, and continuous-duty systems
Examples include the ABB ACS880 and some advanced Danfoss VLT FC-302 models.
📊 Dynamic vs Regenerative – Feature Comparison
| Feature | Dynamic Braking | Regenerative Braking |
|---|---|---|
| Energy Handling | Dissipates energy as heat | Returns energy to power source |
| Components Required | Braking resistor | Regen-capable VFD or module |
| Cost | Lower | Higher |
| Efficiency | Wastes energy | Energy-saving |
| Use Case | Simple stop/start, moderate loads | Heavy-duty, continuous regen, energy efficiency goals |
📦 VFDs by Braking Type
- 🔧 Delta MS300 – Dynamic braking (resistor required)
- 🔧 PowerFlex 4M – Dynamic braking supported
- ⚡ ABB ACS880 – Regenerative braking built-in
- ⚡ Danfoss FC-302 – Regen-ready models available
Need help choosing the right braking method? Contact our team for guidance or sizing support.
🧮 Use Our Free Braking Resistor Calculator
If you’re using dynamic braking, resistor sizing is critical. Try our free tool here:
🔗 Related Reading
- Do I Need a Braking Resistor with My VFD?
- IP20 vs IP66 – Which One Do You Need?
- VFD Sizing Calculator
🛒 Why Buy From Drive Outlet Megastore?
- ✅ 3,000+ VFDs in stock – ABB, Delta, Allen Bradley, Danfoss
- ✅ Dynamic & regen-compatible drives available
- ✅ Braking resistors, filters, and accessories in stock
- ✅ Next-day UK delivery
- ✅ 2-Year warranty on all OEM products
Need help selecting the right braking setup? Contact us today or browse our full inverter range below.
