When driving stepper motors at high voltage, pay close attention to the following aspects to ensure safe and reliable system operation:
Drive Compatibility:
Whether a motor can operate at a given high voltage depends on both the driver's voltage rating and the motor's insulation capability. Ensure the driver supports the target voltage and that the motor's insulation rating is not exceeded.
Motor Insulation Safety:
All StepperOnline motors undergo rigorous high-voltage insulation testing before leaving the factory. Key tests include:
- Coil-to-Ground (PE) Dielectric Withstand Voltage: e.g., 700 V, 20 mA, for 1.0 second.
- Inter-turn Insulation: e.g., tested at 500 V.
- Complete Machine Dielectric Withstand Voltage: e.g., 750 V, for 1.0 second. Components such as the stator and end covers must maintain full insulation integrity relative to the windings. The motor is approved for use only after passing all tests.
Control Current and Power:
When operating at higher voltages, the drive current can be reduced accordingly to limit total power dissipation. Select a power supply with adequate headroom — for typical NEMA 23/34 stepper motor applications, a 150 W–200 W supply is often sufficient, but always size the supply based on your specific motor's rated current and the operating voltage.
Safety Grounding Measures:
If the motor requires grounding, connect a dedicated grounding conductor securely to the motor's end cover.
Monitor Operating Temperature to Prevent Overheating:
Prolonged high-voltage driving increases motor heat generation. Monitor the motor temperature closely to prevent thermal damage to the insulation or internal components, which would reduce lifespan and reliability.
For recommended voltages for specific stepper motors, please refer to this article: Voltage of Stepper Motor