Motor Controller

A Motor Controller is an electronic device that controls the operation of an electric motor by regulating the voltage, current, and frequency supplied to the motor. Motor controllers are also commonly referred to as ESCs (Electronic Speed Controllers), particularly within the RC and electric vehicle industries.

In the VESC ecosystem, the motor controller is responsible for converting the battery’s DC voltage into controlled three-phase power for the motor. It continuously monitors the motor and system conditions to provide smooth, efficient, and safe operation.

Modern motor controllers can provide a wide range of functions, including:

• Motor speed control
• Torque control
• Current control
• Regenerative braking
• Position control
• FOC (Field-Oriented Control)
• CAN Bus communication
• Data logging and telemetry
• Motor and battery protection

A motor controller sits between the battery and the motor, receiving commands from user inputs, displays, scripts, sensors, or other devices and converting them into precise motor control.

⚠️ A motor controller does not create power. It can only control and distribute the power available from the battery. The maximum performance of a system is ultimately limited by the battery, motor, cooling system, and motor controllers specifications.

Example

A motor controller can receive power from a battery, process throttle commands from a remote control, and regulate the motor current to provide the desired acceleration, speed, and braking performance.

In simple terms: a motor controller is the device that sits between the battery and motor and controls how the motor operates.