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EEFinder
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A 250 VDC motor drawing 390 VDC!
any one with any explanation?
Thanks.
any one with any explanation?
Thanks.
Powering a 250 VDC Motor with 390 VDC – Questions?
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Discussion Overview
The discussion revolves around the operation of a 250 VDC motor that is reportedly receiving 390 VDC. Participants explore the implications of this voltage discrepancy, including potential effects on motor performance and the accuracy of voltage measurements.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant questions the concept of a motor "drawing" voltage, suggesting that motors operate based on current rather than voltage.
- Another participant clarifies that the issue pertains to a voltage reading of 390 VDC instead of the expected 250 VDC.
- A suggestion is made to adjust the voltage regulator, noting that motor speed at constant load is proportional to voltage.
- One participant expresses confusion about the unchanged speed of the motor despite the higher voltage reading.
- A question is raised regarding the nature of the power supply and its capability to provide 390 volts.
- Concerns are mentioned about the accuracy of an analog meter, particularly if it was set to the AC volts scale while measuring DC voltage.
- A participant recounts an incident involving an electrician who was unsure if his meter was set correctly for DC measurements.
Areas of Agreement / Disagreement
Participants do not reach a consensus on the implications of the 390 VDC reading, with multiple viewpoints regarding the accuracy of measurements and the motor's performance under these conditions. The discussion remains unresolved.
Contextual Notes
There are limitations regarding the assumptions about the measurement tools used and the conditions under which the motor operates. The discussion highlights uncertainty about the accuracy of voltage readings and the implications for motor operation.
Who May Find This Useful
This discussion may be of interest to electrical engineers, technicians working with DC motors, and individuals involved in troubleshooting electrical systems.