Motor drive control device and method for controlling the same
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Solution Overview
Problem
Existing motor drive control systems face complexity in determining rotational direction using position sensors, particularly when the energization pattern is disturbed, requiring multiple lead wires and a complex configuration.
Innovation Solution
A motor drive control device with a control circuit unit that compares signals from two Hall elements to generate polarity signals, allowing for rotational direction determination using a reduced number of lead wires by analyzing transitions in these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two position sensors (Hall elements) are used to determine rotational direction, then rotational direction detection reliability is improved, but the number of lead wires increases to at least four, resulting in increased device complexity
Solution Approach 1:
The patent combines the output signals from two Hall elements through logical operations within the control circuit. The first polarity signal is generated by comparing outputs from the first Hall element, and the second polarity signal is generated by comparing outputs from the second Hall element. These polarity signals are then combined through transition comparison to determine rotational direction, effectively merging multiple sensor inputs into a unified detection mechanism that reduces lead wire requirements while maintaining reliability
Solution Approach 2:
The control circuit acts as an intermediary that processes signals from the Hall elements. By introducing polarity signal generation as an intermediate processing step, the system transforms raw Hall element outputs into simplified polarity representations, which are then compared for rotational direction determination. This intermediary processing reduces the complexity of direct multi-wire connections
2Measurement precision
If multiple Hall elements are used with separate lead wires for each, then measurement precision for rotational direction is improved, but the quantity of substance (lead wires) increases
Solution Approach 1:
The patent merges the signal paths from multiple Hall elements by processing their outputs through shared comparison circuits within the control unit. Instead of requiring separate lead wires for each Hall element output, the system combines signal processing functions, reducing the physical quantity of lead wires while preserving the measurement precision achieved through multiple sensors
Solution Approach 2:
The control circuit is designed with multi-functional capability to handle signals from multiple Hall elements through a unified processing architecture. The same control circuit generates both first and second polarity signals and performs rotational direction determination, making the system more universal and reducing the need for dedicated signal paths for each sensor
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 simple and efficient determination of motor rotational direction with fewer lead wires, reducing system complexity and improving reliability.
Implementation Method 1
a first comparison element configured to compare the magnitudes of a positive output signal and a negative output signal output from a first Hall element... the first Hall element being provided at a first position where a change in a magnetic flux generated with the rotation of the motor is detectable
Data Source
AI summary
To provide a motor drive control device capable of determining the rotational direction of a motor using a simple configuration with a reduced number of lead wires from position sensors, and a method for controlling the motor drive control device. A control circuit unit of a motor drive control device includes a first comparator configured to compare the magnitudes of a first positive Hall signal and a first negative Hall signal output from a first Hall element, thereby generating a first position detection signal; a second comparator configured to compare the magnitudes of a second negative Hall signal output from a second Hall element and the first negative Hall signal, thereby generating a second position detection signal; and a rotational direction determination unit configured to compare the transitions of the first position detection signal and the second position detection signal, thereby determining the rotational direction of a motor.