Battery

Fig 1. Turnigy Nano-Tech Battery

Table 3: Nominal Capacity Required for an Allotted Run Time

Power Consumption Estimate

Table 2: Total Current Drawn from Components

Run Time

30 mins

Nominal Capacity Required (assuming components always on)

2458 mA

As show in Table 2, a maximum of 2458 mA was found to be the maximum amount of the capacity that the battery would require in order to ensure that the ROBO MAT would be able to traverse the barrel of the railgun in 30 minutes. While this calculation uses stall current for the motors, a more likely estimate would be approximately 300 mAh for each motor. This would result in a total draw current of 2315 mAh or 1157.5 mA for a 30 min run. This justified the purchase of the Turnigy Nano-tech battery, Fig 1, which has the following specifications:

● 2 cells/ 7.4 V

● Nominal capacity: 3000 mAh

● Dimension (LxWxH): 88 x 34 x 25 mm

● Balance Plug

● Discharge Plug

● Weight: 146g

The battery was encased in a 3D printed ABS holder to keep it secured in the chassis (Fig 2). Furthermore, the battery case featured a slot for the tracer wheel encoder cable to feed through.

Fig 2. CAD Design of Battery Holder

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