A brushless DC motor speed regulating device and a speed regulating method

By employing an energy balance control method that eliminates the need for a PID controller, the problems of narrow bandwidth and slow dynamic adjustment in brushless DC motor speed control systems are solved, enabling rapid energy adjustment and improved system reliability while reducing the size and cost of the main circuit.

CN117748996BActive Publication Date: 2026-07-21HARBIN ENG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HARBIN ENG UNIV
Filing Date
2023-12-20
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing brushless DC motor speed control systems, due to the use of PID controllers, suffer from problems such as narrow bandwidth, control lag, overshoot, oscillation, and excessively long dynamic adjustment time, which limit the performance improvement of the speed control system.

Method used

A speed control device without a PID controller is adopted. It uses energy balance relationship for control through detection circuit, calculation circuit and logic drive circuit. This includes detecting DC bus current and voltage, stator winding current and voltage and speed, calculating Win, ΔWLref, ΔE, WR and WLoad, and driving the speed control main circuit to provide power according to the Criterion criterion.

Benefits of technology

This technology enables rapid energy adjustment of brushless DC motors, shortens adjustment time, avoids overshoot and oscillation, improves system reliability and speed regulation performance, and reduces the size and cost of the main circuit.

✦ Generated by Eureka AI based on patent content.

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    Figure CN117748996B_ABST
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Abstract

A brushless DC motor speed control device and method are disclosed, which solves the problem of the adverse effects of the inherent defects of the PID controller on the performance of the speed control device, belonging to the field of motors. This invention uses the energy balance relationship within a control cycle as the control criterion to calculate the electrical energy W injected into the brushless DC motor by the speed control main circuit within the current control cycle. in The expected energy storage change difference ΔW of the equivalent inductance of the stator phase of a brushless DC motor Lref The difference in rotor kinetic energy ΔE of the brushless DC motor, and the energy consumed by the three-phase stator winding resistance W during the current control cycle. R And the energy consumed by the total load torque during the current control cycle, W Load The criterion obtained is Criterion = W in -ΔW Lref -ΔE-W R -W Load When Criterion < 0 and the sector where the rotor is located is in the on state, the drive speed control main circuit provides power to the stator winding of the brushless DC motor; otherwise, the drive speed control main circuit stops providing power to the stator winding of the brushless DC motor.
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