Motor Driving Control Device Phase Synchronization
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Solution Overview
Problem
Existing motor driving control devices face efficiency degradation due to phase differences between induced voltage and coil current caused by variations in motor characteristics, load, or temperature, which existing methods fail to adequately address.
Innovation Solution
A motor driving control device and method that includes an induced voltage detecting unit, a controller, and an inverter circuit, where the controller detects a rotor position, measures zero-cross points of induced voltage, calculates coil current zero-cross points, and adjusts energization timing to synchronize phases, ensuring efficient motor operation by adjusting the PWM signal timing based on measured pulse widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor is driven by matching the phase of induced voltage and coil current, then driving efficiency is improved, but phase differences occur due to motor characteristic variations, load changes, or temperature changes, causing efficiency degradation
Solution Approach 1:
The patent implements feedback control by detecting the zero-cross point of the induced voltage, calculating the zero-cross point of the coil current based on the pulse width of the regenerated voltage, and adjusting the energization timing to synchronize the phases. This closed-loop feedback mechanism continuously compensates for phase differences caused by motor characteristic variations, load changes, or temperature changes, maintaining high driving efficiency under varying operating conditions.
2Ease of operation
If the driving circuit stops operation for a certain time period to adjust phase, then phase adjustment is achieved, but a phase difference occurs by at least half cycle of PWM synchronous signal
Solution Approach 1:
The patent applies preliminary action by detecting the zero-cross point of the induced voltage in advance and using this detection to calculate the appropriate energization timing. By performing the phase adjustment calculation based on the pulse width measurement before the next PWM cycle begins, the system avoids the half-cycle delay inherent in methods that wait for polarity changes, thereby reducing time loss while maintaining phase adjustment capability.
3Device complexity
If the zero-cross points are regarded as coincident when polarity changes occur, then phase detection is simplified, but phase difference occurs due to PWM synchronous signal timing
Solution Approach 1:
The patent introduces an intermediary measurement approach by using the pulse width of the regenerated voltage as an intermediate parameter to calculate the zero-cross point of the coil current. Instead of directly detecting the zero-cross point during PWM operation, the system measures the pulse width during the off-period and uses this intermediate value to accurately determine the phase relationship, thereby improving measurement precision without significantly increasing device complexity.
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
This solution effectively synchronizes the phases of induced voltage and coil current, enhancing motor driving efficiency and reducing efficiency losses due to phase differences, even under varying conditions.
Implementation Method 1
an inverter circuit for outputting a driving signal for driving the motor to the motor based on the PWM signal generated by the controller
Data Source
AI summary
A motor driving control device includes an induced voltage detecting unit configured to detect an induced voltage of a motor, a controller for generating a PWM signal, and an inverter circuit for outputting a driving signal to the motor based on the PWM signal. The controller is configured to detect a position detection signal, to measure a zero-cross point of the induced voltage of the motor based on a detected timing of an edge of the position detection signal, to stop output of the driving signal only for a predetermined period containing the zero-cross point of the induced voltage, to measure a pulse width of a regenerated voltage in the period, to calculate a zero-cross point of coil current based on the measurement result, and to adjust the energization timing based on the calculation result. The predetermined period is a period of one cycle of the PWM signal.