Motor No-Load Detection Control for Electric Work Machines
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Solution Overview
Problem
Existing electric work machines face challenges in accurately detecting the no-load state of motors, which affects the convenience and efficiency of tools like saw blades during operations.
Innovation Solution
The implementation of a control circuit with a physical quantity obtainer, variation obtainer, sum calculator, and drive controller that calculates a sum value of variations in physical quantities over a specific period to determine the no-load state, allowing for precise motor control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the motor is controlled using conventional load detection methods, then the control system is simple, but the no-load state detection accuracy is insufficient
Solution Approach 1:
The control circuit is divided into functional modules: physical quantity obtainer, variation obtainer, sum calculator, and drive controller. Each module performs a specific function in the detection process, breaking down the complex detection task into manageable segments that improve accuracy without overwhelming system complexity
Solution Approach 2:
The system performs preliminary calculations by obtaining variations of physical quantities and calculating their sum values before making the final no-load state determination. This preliminary processing of data enables more accurate detection by preparing processed information in advance for the drive controller
2Ease of operation
If the soft no-load control is executed again after motor varies to no-load state, then the convenience of the electric machinery tool is enhanced, but the response timing must be accurate
Solution Approach 1:
The control system continuously monitors the physical quantity variations and calculates sum values to detect when the motor transitions to a no-load state. This feedback mechanism enables the system to automatically detect the state change and trigger appropriate control actions at the right timing
Solution Approach 2:
The system performs preliminary detection and calculation of sum values to determine no-load state before executing the soft no-load control. This ensures that the control action is initiated at the optimal moment, enhancing convenience without sacrificing response timing accuracy
Data Source
AI summary
An electric work machine according to one aspect of the present disclosure includes a motor, a drive circuit, and a control circuit. The control circuit includes a physical quantity obtainer, a variation obtainer, a sum calculator, and a drive controller. The physical quantity obtainer obtains a physical quantity every time a detection timing arrives. The variation obtainer obtains a variation of the physical quantity every time the detection timing arrives. The sum calculator calculates a sum value every time the detection timing arrives. The sum value corresponds to a sum of one or more variations. The drive controller controls the motor in accordance with a first control system via the drive circuit based on the sum value satisfying a no-load detection requirement.