Abstract
The drive is the electric motor, its controlling electronics, the speed reduction , and the driven wheel (solar racing cars usually have only one driven wheel). Figure 5.1 is a schematic of a typical drive connected to its solar-electric power source. This chapter discusses the operation of each of the drive’s components.
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Notes
- 1.
The picture is simplified for clarity. The windings are actually placed in slots so the force on them will not tear them free.
- 2.
Imagine the right hand grasping the wire with the thumb pointing in the direction of the current. The fingers curl in the direction of the wire’s field. This is the “right-hand rule.”
- 3.
The counter-emf constant is measured at no load, and therefore does not reflect the field distortion caused by the armature current.
- 4.
Equation (5.11) leads to an interesting relation between k S and k C. Substituting from Eqs. (5.5) and (5.6) and rearranging gives
$$ {k_c} = \frac{\pi }{{30}}{k_s}\left( {1 + \frac{{{P_L}}}{{{P_M}}}} \right)$$The ratio P L/P M is usually small, so
$$ {k_c} \approx \frac{\pi }{{30}}{k_s}$$Multiplying kS from Ibrahim (1989), 0.2152 N·m/A, by π/30 gives 0.02253 V/rpm, quite close to 0.02254 V/rpm, the value of kC given by Ibrahim.
- 5.
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Thacher, E. (2015). Electric Motor Drives. In: A Solar Car Primer. Springer, Cham. https://doi.org/10.1007/978-3-319-17494-5_5
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