Overview
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Stepper motors are commonly used for positioning in printers and digital
cameras.
In evaluating a stepper motor, detent torque is an important characteristic
since it is the cause of vibration and noise. Detent torque needs to be
investigated before designing a stepper motor.
This note presents the use of magnetic field analysis to evaluate the detent
torque of a stepper motor. |
Detent Torque/ Magnetic Flux Density Distribution
Figure 1 shows the detent torque. Figure 2 shows the magnetic flux density
distribution of the yoke at the rotation angle of 7.5 degrees.
One period of detent torque is assumed to be 7.5 degrees according to the
geometry; however, it is 15 degrees due to the magnetic flux flow in the
3D direction between the upper inductors and the lower inductors. |
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