Motor Driving Control Device for Three-Phase Coil Disconnection Detection
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Solution Overview
Problem
Existing motor driving control devices for three-phase motors require complex configurations and increased manufacturing costs due to the need for voltage conversion circuits and filters to detect coil abnormalities like disconnection and short circuits.
Innovation Solution
A motor driving control device with a control circuit unit that sequentially switches energization patterns of three-phase coils, using a voltage comparison unit to determine disconnection by comparing drive current magnitudes with a threshold value, and a disconnection determination unit to identify disconnected phases based on comparison results, allowing for simple circuit configurations and effective abnormality detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage conversion circuits and filters are used to detect coil abnormalities, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential detection function needed for coil abnormality detection, eliminating the need for complex voltage conversion circuits and filters. By using a simplified voltage detection circuit that directly monitors phase voltages during PWM energization, the invention achieves adequate detection precision without the burden of complex circuitry.
Solution Approach 2:
The patent employs a simple voltage detection circuit with basic components rather than expensive, complex voltage conversion circuits and filters. This simplified approach uses readily available, low-cost components to achieve the detection function, reducing overall device complexity and manufacturing cost.
2Measurement precision
If voltage conversion circuits and filters are used to detect coil abnormalities, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive voltage conversion circuits and filters with a simplified voltage detection circuit using basic, low-cost components. This substitution significantly reduces manufacturing costs while maintaining sufficient detection capability for coil abnormalities.
Solution Approach 2:
By extracting only the essential detection functionality and removing unnecessary voltage conversion and filtering components, the patent reduces bill of materials costs and simplifies the manufacturing process, leading to lower overall manufacturing costs.
3Device complexity
If simple circuit configuration is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent utilizes the existing PWM energization signals and phase voltage characteristics to perform self-diagnosis of coil abnormalities. The detection system leverages the operational signals already present in the motor drive circuit, eliminating the need for separate, complex detection circuits while maintaining detection precision.
Solution Approach 2:
The patent performs coil abnormality detection at specific periodic intervals during the PWM energization cycle by monitoring phase voltages at predetermined timing points. This periodic sampling approach enables accurate detection using simple circuitry that captures critical voltage transitions during each energization phase.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient detection of coil disconnections with a simplified circuit configuration, reducing manufacturing costs and improving the reliability of motor operation by accurately identifying and responding to abnormal states.
Implementation Method 1
a current detection circuit for detecting a voltage value corresponding to a magnitude of the drive current, wherein the control circuit unit includes a voltage comparison unit for comparing the magnitude of the drive current with a predetermined current threshold value based on the voltage value
Data Source
AI summary
A motor driving control device has a motor driving unit that has a plurality of switching elements and supplies a drive current to three-phase coils of a motor, a control circuit unit for sequentially switching energization patterns of the three-phase coils by outputting a drive control signal for operating the plurality of switching elements to the motor driving unit, and a current detection circuit for detecting a voltage value corresponding to a magnitude of the drive current. the control circuit unit includes a voltage comparison unit for comparing the magnitude of the drive current with a predetermined current threshold value based on the voltage value each time switching of the energization patterns is performed, and a disconnection determination unit for determining whether any one phase of the motor is in a disconnection state, based on a comparison result of the voltage comparison unit for the plurality of energization patterns.