Stepper phase current made easy

It is hard to stay up to date when one is floating in a sea of technical jargon. However, it is imperative that engineers know the terminology associated with the areas in which they work. For example, a mechanical engineer specifying a stepmotor should understand the associated mechanical and elect...

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Veröffentlicht in:Machine Design 2007-08, Vol.79 (16), p.67
Hauptverfasser: Mindy Lin Cheng, Robinson, Jeannie
Format: Artikel
Sprache:eng
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Zusammenfassung:It is hard to stay up to date when one is floating in a sea of technical jargon. However, it is imperative that engineers know the terminology associated with the areas in which they work. For example, a mechanical engineer specifying a stepmotor should understand the associated mechanical and electrical terms. An understanding of how power is applied to a stepmotor to make it step gives insight into the different current ratings. Power for the windings comes from the stepmotor driver. Current ratings in stepmotors stem from the amount of power and, thus, heat that the motor winding can handle. Because current is constantly changing in an operating motor, a statistical method is used to calculate the current's effect on motor power. Using the Root Mean Square method, the value of all currents are squared, the average of their squared values found, and then the square root is taken of that average value. Thus, for stepmotors, average current, RMS current, and amps RMS are identical ratings.
ISSN:0024-9114
1944-9577