ODrive RegenClamp braking resistor back EMF clamping
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RegenClamp back EMF clamping brake
Regen Clamp Overview
This document describes the Regen Clamp, a device designed to manage regenerative energy in motor control systems.
1. Why Use a Regen Clamp?
When a motor decelerates, its kinetic energy converts into electrical energy that flows back into the system. With a battery power source, this energy can be recaptured (regenerative braking). However, without a battery, this "reverse current" can cause voltage spikes, potentially damaging power supplies, motor drives, and other electronics. The Regen Clamp safely dissipates this excess energy, protecting your system.
2. Wiring the Regen Clamp
Caution: The Regen Clamp contains large capacitors. Connecting it directly to a power source can cause a damaging surge current. Always use protective measures like anti-spark connectors or NTC surge limiters to prevent this.
(Include the wiring diagram here)
3. How the Regen Clamp Works
When a motor's speed drops below a certain threshold during deceleration, it acts as a generator, sending energy back into the system. If the voltage exceeds the Regen Clamp's "clamping voltage," the device activates its braking circuit. This diverts the current through a braking resistor, converting the excess energy into heat.
Specifications:
Dissipation Power: 800W
Size: 58mm x 49mm
Resistor Range: 0.5-20 Ω
Static Current: 0.5mA
Peak Dissipation Current: 60A
Continuous Dissipation Current: 30A
Rated Voltage: 24V (default), adjustable up to 60V
Clamping Voltage: 26.5V (default)
Indicator Lights:
PWR (Green): Power on
ACT (Blue): Braking active
4. Choosing a Braking Resistor
Resistance Value:
Vbus / Ibrake ≤ Rbrake ≤ Vbus² / Pmotor
Rbrake: Braking resistor resistance
Vbus: Bus voltage (24V default)
Ibrake: Continuous dissipation current (30A)
Pmotor: Total motor output power
Power Rating:
The resistor's power rating should exceed the average regenerative power to prevent overheating. For most applications, a lower power rating (e.g., 25W, 50W, 100W) is sufficient.
Key Terms:
Regen Clamp: Device to manage regenerative energy.
Clamping Voltage: Voltage threshold for activating braking.
Braking Resistor: Converts excess energy to heat.
Bus Voltage: System operating voltage.
Continuous Dissipation Current: Maximum continuous current.
Dissipation Power: Power handling capacity.
Average Regenerative Power: Average power generated during deceleration.
