US 2026/0081545 A1 · DEVICE AND METHOD FOR CONTROLLING A BLDC MOTOR

Abstract

This invention provides a method and device for controlling brushless direct current (BLDC) motors, enabling smooth transitions between open loop control at low speeds and closed loop control at higher speeds. The device integrates modules for driving, observing, and transitioning between open and closed loop IB (current and back electromotive force) angles. A weighted average of the IB angles ensures stable motor performance during transitions, minimizing torque shocks, current spikes, and noise. The device also features current and voltage regulation to maintain accurate motor speed under varying conditions. Dynamic adjustment of weighting factors based on motor speed and signal-to-noise ratio further enhances control stability. This system improves motor efficiency in motor driving, reduces the risk of stalling, and optimizes performance across a wide range of operating speeds.

Claims15

Dependent claims

A device for controlling a brushless direct current motor, the device comprising:

a driving module configured to apply a voltage to the motor to drive it;
an observer module configured to obtain a closed loop IB angle, between a measured current angle and a closed loop BEMF angle based on the applied voltage;
an open loop angle module configured to obtain an open loop IB angle, between the measured current angle and an open loop BEMF angle , wherein the open loop BEMF angle is calculated based on a desired open loop control profile;
an angle transition module configured to calculate a weighted average IB angle based on the closed loop IB angle and the open loop IB angle;
an angle control module configured to determine a voltage angle to be applied to the motor based on the weighted average IB angle.

2 more elements

Dependencies are inferred from the claim text.

Device and method for controlling a bldc motor

Life of this patent

Device and method for controlling a bldc motor

Life of this patent

Abstract

Claims15