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🚧UNDER CONSTRUCTION [[How to contribute to the megathread|You Can Help!]]🚧
Our vehicle is a single motor + differential car. Many other teams have more sophisticated drivetrains, including setups with hub motors, which allow you to eliminate all spinning shafts inboard of the wheels. We have stuck with the traditional single motor + differential setup for simplicity. 🚧I need help for this🚧
[!Warning] For most up to date information, check the draw.io
🚧draw.io output and generals🚧
The shutdown circuit (Described in [[FSAE 2025 Rules|EV.7.2]]) is a safety mechanism which serves to disconnect the [[Team Terminology#Tractive System (TS)|Tractive System]] either automatically or manually. This is done through a series of switches and [[Team Terminology#Interlocks|interlocks]] which can break power supply to the [[Team Terminology#Isolation Relays (IR)|IR'S]] thus isolating the Tractive System from the outside world to protect us from the high voltage. For specifics on the wiring, see the drawing below.
CAN is a rugged information bus protocol that allows many devices to communicate with one another over a limited number of wires (two per bus). On NFR25 we have two separate CAN busses. This means that devices can only communicate with other devices on the same bus (unless they use another device which is on both busses as an intermediary). Our two CAN busses are called DATA and DRIVE CAN. DATA is (as the name suggests) intended for purely data acquisition purposes and is not [[Team Terminology#Drive Critical|drive critical]]. DRIVE contains information directly related to controlling the driving of the car and is drive critical. There are two buses to reduce the [[Team Terminology#Bus Load|bus load]] of any one bus which is intended to make the car's communication network more robust.
[!note] For more low level information on how CAN actually works, refer to this article on DigiKey or this one, as well as this article on CAN errors
The drawing below denotes which devices are connected to which CAN busses, arranged as to approximate location within the car.
🚧 overview text 🚧 The [[Team Terminology#Accumulator|Accumulator]] is the high voltage battery which supplies the power that drives our motor. It is important to exercise caution when handling the Accumulator
| Cells | Configuration | Max Voltage | Nominal Voltage | Capacity | Fused Current |
|---|---|---|---|---|---|
| Molicel p45b | 5 Series Segments see table below | 588 V | 504 V | 🚧 | 80 A Fuse Datasheet |
| Cells | Configuration | Max Voltage | Nominal Voltage | Capacity | Fused Current |
|---|---|---|---|---|---|
| Molicel p45b | [[Team Terminology#Battery Pack Configuration Shorthand|28s3p]] | 117.6 V | 100.8 V | 🚧 | 80 A |
The [[LV Battery]] powers everything other than the [[Team Terminology#Tractive System (TS)|Tractive System]]. It's located in the [[#LV Box]]. The mechanical structure is designed by the [[Accumulator Home|Accumulator Subteam]] and the electrical structure is designed by the [[Power Distribution Home|Power Distribution Subteam]].
| Cells | Configuration | Max Voltage | Nominal Voltage | Capacity | Fused Current |
|---|---|---|---|---|---|
| Molicel p42a | [[Team Terminology#Battery Pack Configuration Shorthand|6s3p]] | 25.2 V | 21.6 V | 12.6 Ah | 40 A Fuse |
All [[Team Terminology#Grounded Low Voltage (GLV)|GLV]] power is supplied by the [[#Low Voltage (LV) Battery|LV Battery]]