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Motors & Generators
All Other Types of Motors
Analyzing the internal mechanics of a watch stepper motor
Presented here is the internal mechanics of a watch employing a stepper motor. The watch is simulated using Infolytica's Transient 3D with Motion solver. The device consists of a steel frame (12.1 mm across) with a stranded coil wrapped around it. The rotor of the stepper motor is made entirely of a neodymium permanent magnet with a fixed direction of magnetization. Instead of modeling all of the underlying gears attached to the rotor, a moment of inertia is applied to correctly simulate the motion.
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The effects of damping due to bearing friction on a permanent magnet stepper motor
The stepper motor used in this application page is made of a stator with eccentric pole faces and a rotor made of samarium cobalt permanent magnet that is magnetized in a fixed direction. The rotor rotates in steps of 180 degrees. Each step in the rotor is due to a short pulse from a current source. To obtain a uni-directional motion, the current pulse is alternating. In this example, the response due to one pulse is examined. The damping due to bearing friction is taken into account in the simulation. Since there is a geometric and electromagnetic symmetry, only half of the device needs to be modeled.
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Axial flux motor
This motor is different from conventional electric motors due to the different path of the magnetic flux. In conventional motors the flux flows radially through the air gap between the rotor and the stator. However in this motor the flux flows parallel to the axle of the motor. The rotor, often referred to as a pancake rotor, can be made much thinner and lighter, hence these motors are often used for applications requiring quick changes in speed.
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Analysis of a miniature DC Motor operating on the polarized armature principle
This application focuses on a simple DC Motor which operates on the polarized armature principle. The motor is analysed using the MagNet Transient 2D with Motion solver. The analysis starts with the rotor stationary and no current in the coils. At t=0 a voltage source is switched on which causes the motor to accelerate gradually.
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