# Selecting a BLDC Motor for an Electric Tricycle | 400W, 48V, 0-4m/s in 20s

• Shravan N Agni
In summary, the conversation discusses the design of an electric tricycle with rear wheel drive and a weight of 400kgs, including the driver. There are constraints for the motor's output power (max 400 watts) and voltage (max 48v). The desired speed of the vehicle is 0 to 4m/s in 20 seconds, and there are inquiries about calculating the speed for hill climbing on a maximum 7-degree gradient. Additionally, the group discusses the calculations needed for selecting a motor and determining if it can deliver sufficient power for the given time period and conditions.
Shravan N Agni
We are designing an electric tricycle having rear wheel drive(26 inches wheel dia).It will weigh around 400kgs including drivers.

There are constraints for motor output power(max 400 watts) and voltage(max 48v).
What are the calculations to be done for the selection of motor.
The desired speed of the vehicle is 0 to 4m/s in 20 seconds.

How can I calculate the speed of the vehicle for hill climbing(max 7degree gradient)?

Calculate the change in energy for the given mass going from Vi to Vf in the time allowed.

Can the motor do this much work in this period of time? Does it deliver sufficient power?

On a given gradient at a given speed, the vehicle will be increasing in potential energy at a rate of (m g delta h)/(delta t).

Use this to figure out its max rate of climb with a motor delivering a given power.

## What is a BLDC motor?

A BLDC (brushless DC) motor is a type of electric motor that uses electronic commutation instead of brushes and a commutator to control the speed and direction of the motor.

## What factors should be considered when selecting a BLDC motor for an electric tricycle?

When selecting a BLDC motor for an electric tricycle, some important factors to consider include the power rating (in watts), voltage, maximum speed, and acceleration capabilities of the motor. Other factors such as size, weight, and cost may also be important depending on the specific application.

## What is the significance of the 400W, 48V, and 0-4m/s in 20s specifications for the electric tricycle's motor?

The 400W rating indicates the maximum power output of the motor, the 48V represents the voltage at which the motor operates, and the 0-4m/s in 20s indicates the maximum speed and acceleration capabilities of the motor. These specifications are important in determining the overall performance and efficiency of the electric tricycle.

## Why is a BLDC motor a good choice for an electric tricycle?

BLDC motors are a good choice for electric tricycles because they offer high power and torque in a compact and lightweight package. They also have a longer lifespan and require less maintenance compared to brushed motors. Additionally, BLDC motors are more efficient, making them ideal for use in electric vehicles.

## How can I determine the appropriate size and power rating for a BLDC motor for my electric tricycle?

The appropriate size and power rating for a BLDC motor for an electric tricycle can be determined by considering the weight and desired speed of the tricycle, as well as the terrain and rider's weight. There are also online calculators and motor selection tools available that can assist in determining the appropriate motor for a specific application.

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