Variable speed drive for sensorless PWM control of an AC motor using PWM-induced artifacts
By using an improved PWM control method, the motor state is estimated by utilizing the inverter control signal ripple, which solves the problems of noise and sensor dependence in sensorless VSD and achieves efficient and reliable motor control at low speeds.
CN112564583BActive Publication Date: 2026-05-29SCHNEIDER TOSHIBA INVERTER EUROPE SAS
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SCHNEIDER TOSHIBA INVERTER EUROPE SAS
- Filing Date
- 2020-09-25
- Publication Date
- 2026-05-29
AI Technical Summary
Technical Problem
Existing sensorless VSDs, when controlling AC motors, suffer from noise and unmodeled dynamic characteristics due to signal injection methods, and require dedicated current sensors, impacting reliability and cost.
Method used
By using an improved PWM control method, the motor state is estimated by utilizing the ripple information in the inverter control signal. Combined with drive current sensing, sensorless closed-loop control is achieved, avoiding signal injection.
Benefits of technology
It achieves noiseless and efficient motor control at low speeds, reduces complexity and cost, improves reliability, and eliminates the need for dedicated sensors.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN112564583B_ABST
Abstract
A variable speed drive (200) for controlling a motor (300) based on a control law includes a method for supplying a drive voltage (u) to the motor (300). pwm The output terminal (210), drive voltage generating power inverter (220), drive controller (230) and current sensor (240) for measuring the drive current absorbed by the motor (300), the drive controller (230) includes a PWM generator (232), a control law module (234) and a state variable estimator (236) for estimating the state variables of the motor (300).
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