phogan22
Newbie level 2
Hi all,
Be warned, mechanical engineer here. I'm working on a project with a DC non-commutated linear moving-magnet voice coil, controlled with a servo drive in current mode, and I can't seem to get a straight answer from the manufacturer on the maximum voltage the device is rated to.
The rated current is 2.4 A continuous/7.2 A peak, the back-emf coefficient is 83.6 V/m/s, the DC resistance is 12 ohm at 20 C, and the inductance is 6.5 mH at 20 C. The magnet wire is AWG 22, Type-E rated to 600 V. As a worst-case operating point at peak current and max velocity could be as high as 1.9 m/s. Accounting for a 50% higher resistance due to increased temperature, the highest voltage I could see is ~160 V_bemf and ~130 V_R (ignoring the L*di/dt term) for a total of 290 VDC. I only really plan on leaving it at 2.4 A, so this voltage is likely higher than I'd see.
I've sized a servo drive and power supply that are able to deliver this voltage, but my question here is: is the high voltage itself bad for the voice coil? What issues might there be even if I use the servo drive to keep the continuous current below 2.4 A and the voltage stays below a reasonable safety factor on the wire rating?
Thanks,
Paul
PS: More info on the actuator is here: https://www.h2wtech.com/product/voice-coil-actuators/NCM08-35-450-3LB
Be warned, mechanical engineer here. I'm working on a project with a DC non-commutated linear moving-magnet voice coil, controlled with a servo drive in current mode, and I can't seem to get a straight answer from the manufacturer on the maximum voltage the device is rated to.
The rated current is 2.4 A continuous/7.2 A peak, the back-emf coefficient is 83.6 V/m/s, the DC resistance is 12 ohm at 20 C, and the inductance is 6.5 mH at 20 C. The magnet wire is AWG 22, Type-E rated to 600 V. As a worst-case operating point at peak current and max velocity could be as high as 1.9 m/s. Accounting for a 50% higher resistance due to increased temperature, the highest voltage I could see is ~160 V_bemf and ~130 V_R (ignoring the L*di/dt term) for a total of 290 VDC. I only really plan on leaving it at 2.4 A, so this voltage is likely higher than I'd see.
I've sized a servo drive and power supply that are able to deliver this voltage, but my question here is: is the high voltage itself bad for the voice coil? What issues might there be even if I use the servo drive to keep the continuous current below 2.4 A and the voltage stays below a reasonable safety factor on the wire rating?
Thanks,
Paul
PS: More info on the actuator is here: https://www.h2wtech.com/product/voice-coil-actuators/NCM08-35-450-3LB