I'm in the process of choosing a small DC motor for an application, and I found that they normally come in two voltage ratings. 90 and 180 V.
Here are couple of examples: 90VDC motor, and 180VDC motor.
Why is that? I mean, if a standard 120 VAC source were to be rectified, a pulsed halfwave with an RMS of 120V would be obtained, peaking at 170V. And if 220VAC were to be rectified, it would yield 220V rms, peaking at 311V.
Why is there no apparent relationship between these standard values, and the motors' dc rating? Were those motors designed to run from a special power supply?
@MaxHeadRoom
Here are couple of examples: 90VDC motor, and 180VDC motor.
Why is that? I mean, if a standard 120 VAC source were to be rectified, a pulsed halfwave with an RMS of 120V would be obtained, peaking at 170V. And if 220VAC were to be rectified, it would yield 220V rms, peaking at 311V.
Why is there no apparent relationship between these standard values, and the motors' dc rating? Were those motors designed to run from a special power supply?
@MaxHeadRoom