Author: Dr. Stephen Williams

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Abstract

Here, the students learn how brushless DC motors have made personal electric vehicles (PEVs) possible, and calculate how much using a PEV instead of an automobile for some of their daily driving can impact their production of carbon dioxide, based on United States driving patterns. In the laboratory, students build a brushless DC motor using three different control methods, based on a reed switch, a Hall effect sensor, and optoelectronics, respectively. In the process, students learn about motors, and compare the components used for control in terms of their reliability.

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Brushless DC electric motor maxon motor
maxon EC-i 40

Electronically commutated internal rotor motors - Short but highly dynamic.

In automation, many applications are characterised by high dynamism and high torque at the same time. Spatial restrictions also mean that drives must be short, have a long service life and be maintenancefree, as replacing them can often be too expensive and time consuming. The new EC-i motors from maxon motor offer solutions that fit these requirements perfectly.

maxon's EC-i motors are designed as brushless, grooved internal rotor motors, the advantages being the rotor's low inertia, minimal detent, robust bearings and compact construction. The use of high-powered permanent magnets ensures high power density, providing great speed stability under load.

These motors are available in 40 mm diameter and in two lengths, namely
26 mm (50 Watt) and 36 mm (70 Watt). The modular system with gearheads, encoders and controllers from the maxon delivery program offers a large number of possible combinations.

EC-i motors are ideally suited for applications that require maximum dynamism in minimum space. Typical areas of application are robotics, industrial automation and security technology.