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Feeding and Control of a Brushless Triphase Motor for an Electric Bicycle
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| Author(s) |
M. Karmous; C. Espanet; J.-L. Billod; S. Robert; J.-M. Kauffmann |
| Abstract |
This paper describes a command for a brushless DC motor propelling an electric bicycle. This
command allows the motor to work in traction and in braking in order to recover electrical energy going
downhill.
The motor used is a brushless DC motor, with permanent Nd-Fe-B magnets, trapezoidal feeding,
reversed structure and built-in the front wheel (direct drive).
The motor has a controlled current because, similar to a machine under continuous current, the torque
is proportional to the current. Thus the user can reduce or increase the speed in modifying the
acceleration command.
Position captors placed in the stator make it possible to define which phase must be fed. To allow
traction and braking the voltage waver is commanded in pulse width modulation (PWM) and the
transistors of a same vertical work in opposition. The duty cycle of the PWM is determined by the
current regulation and the current is measured in the motor phases. The regulation loop has been built
using analogical electronics because digital electronics is more expensive and offers less precision.
This command runs very well on a test bench. It will be tested on a bicycle shortly. The energy recovery
works and make it possible to increase the autonomy of the battery. |
| Download |
| Filename: | EPE1999 - PP00884 - Karmous.pdf |
| Filesize: | 156.6 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-03-24 by System |
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