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Drone ESC BLDC & FOC Selection Guide

I. Core Positioning: Both belong to the core of brushless motor drives, but differ in technological tier.

Both are core solutions for industrial-grade drone ESCs (motor controllers) used to drive brushless motors, but they differ in technical maturity and performance focus:​
  • BLDC Square Wave ESC:Industrial-grade professional program, secure and reliable, highly intelligent, with adaptive working parameters.
  • FOC ESC:Featuring the new vfast detector technology, it delivers low temperature, high efficiency, fast response, and low noise.

II. Working Principle

(1) BLDC Square Wave ESC

  1. DependenceHall sensorObtain the motor rotor position;​
  2. Following the “six-step phase-shifting” logic, apply input to the motor windings.Square wave current；
Features
  • Lightweight design
  • High explosive power
  • good compatibility
  • Optically isolated signal
  • Simple and easy to use, stable and reliable
ROCK 180A 18S电调

(2) FOC (Field-Oriented Control)

  1. Determine the rotor magnetic field direction through current sampling and algorithmic calculation;​
  2. Input to the windingSine wave currentensuring that the stator magnetic field remains perpendicular to the rotor magnetic field at all times;
Features
  • New Vfast Observer Technology Application
  • Precise control
  • Lightweight design
  • Low noise
  • High efficiency
  • Improved throttle linearity
Breeze 80A-M FOC

III. Conclusion: BLDC and FOC are not mutually exclusive alternatives but rather serve distinct functions.

Industrial-grade drones must meet diverse operational demands ranging from high burst performance to high precision. When selecting such drones, three core dimensions should be considered:
  1. Load capacity
  2. Operational accuracy
  3. Cost Budget
The core of the optimal solution lies in precisely matching user application needs.
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