Blueprint for Racing
Let's take a look at what people who race EV karts on circuits think about when they build them.
How to make the kart go faster?
To drive on a circuit, you need a speed of around 30km/h, as well as the power to overcome the elevation changes on the course. Here are some examples to consider:
●Motor area
▼What is the winding like?
The more current that flows through the windings, the higher the rotation speed.
According to Ohm's law V=IR, the resistance needs to be reduced.
・Change the thickness of the winding? Reduce the number of turns?
What happens when the number of turns in the winding is small?
・There is a team that changes the state of the windings while the car is running. What does that mean?
▼Increase motor efficiency
Is there an efficient way to maintain a consistent speed throughout the race?
- Change the motor control method (program)?
What is the role of the "MOSFET" that passes current through the motor? What is the difference between expensive models? What about temperatures?
● Around the battery
▼What are the battery characteristics?
-What is the difference between lead-acid batteries and lithium-ion batteries?
-How much voltage and current can be extracted and for how long?
A (ampere), Ah (ampere-hour)
W (Watt), Wh (Watt-hour)
What are the differences between each unit? How do they differ for each battery?
-How does the way electricity is extracted change depending on the time and circuit?
▼What are the rules for charging?
- How long does it take to charge? What circuits and equipment are required?
・How to charge safely?
Get familiar with your kart's electrical system
If you become familiar with the configuration of the "motor" and "circuit" used in the cart, you will naturally be able to see the problem. Think about it while recalling similar examples.
●What is a brushless motor?
▼What is the rotation principle?
Tamiya motors used in radio-controlled cars are "brushed motors." So, what is the principle behind brushless motors?
▼What is the motor of a car?
Where are the motors that make up a car used and for what purposes?
●What is an inverter?
・What are the differences between the characteristics of direct current and alternating current? What is the principle of conversion?
What is a switch element?
-What are high side and low side?
-What characteristics do capacitors and coils have?