Motor Control Apparatus for Compressor Vibration Reduction
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Solution Overview
Problem
Existing motor control systems for compressors fail to maintain constant speed operation when load torque exceeds the motor's maximum output, leading to vibration and potential breakdown, especially in saturation states.
Innovation Solution
A motor control apparatus and method that includes a power supply unit, a load torque detection unit, and a controller to manage current supply and motor speed, where the controller adjusts the current to prevent saturation by ensuring the maximum current value is less than the reference current value and balances acceleration and deceleration rates of the motor rotation speed, using a power device to block excessive current and a torque compensation calculator to correct the current value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the motor operates at constant speed to reduce vibration, then vibration and noise are reduced, but the motor cannot handle load torque exceeding its maximum output capability
Solution Approach 1:
The motor control system dynamically adjusts operating parameters based on real-time load conditions. The controller modifies current supply and rotation speed according to detected load torque, enabling the motor to adapt between constant speed operation (for vibration reduction) and variable speed operation (for handling excessive load torque), thus resolving the contradiction between vibration reduction and load handling capability
Solution Approach 2:
The system changes operational parameters (current magnitude, rotation speed) based on load torque detection. When load torque is within normal range, the motor operates at constant speed with controlled current to minimize vibration. When load torque exceeds maximum output, the system adjusts parameters to prevent saturation, thereby maintaining both vibration reduction and load handling versatility
2Adaptability or versatility
If the motor is allowed to saturate to handle high load torque, then the motor can handle excessive load, but vibration increases and breakdown may occur
Solution Approach 1:
The load torque detection unit continuously monitors the load torque and provides feedback to the controller. This feedback mechanism enables the controller to detect when load torque approaches the motor's maximum output capability and adjust current supply accordingly, preventing saturation and maintaining motor reliability while still handling high load conditions
Solution Approach 2:
The controller proactively limits current supply before the motor reaches saturation by comparing detected load torque against maximum output thresholds. This preemptive action prevents the harmful saturation state from occurring, cushioning against potential breakdown while maintaining load handling capability through controlled operation
3Power
If the maximum current value is increased to handle high load torque, then the motor output increases, but the current exceeds the reference current value and causes saturation
Solution Approach 1:
The system dynamically determines the maximum current value based on real-time load torque detection rather than using a fixed high current setting. The controller calculates the appropriate current limit to achieve the required motor output without exceeding the reference current value, enabling flexible power delivery while maintaining ease of operation through automated control
Solution Approach 2:
The controller adjusts the maximum current parameter adaptively based on load conditions. When load torque is high, the system increases current up to but not exceeding the reference current value to maximize motor output. This dynamic parameter adjustment resolves the contradiction between increasing power capability and maintaining controlled operation within safe current limits
Data Source
AI summary
A motor control apparatus and method are provided. The motor control apparatus may include a power supply device supplying power to a motor, a power control device selectively blocking current supplied to the motor depending on whether or not the current supplied from the power supply device to the motor is greater than a reference current value, a controller that controls an intensity of the current supplied from the power supply device to the motor, and a load torque detector that detects a load torque generated by the motor as the motor rotates. The controller controls a maximum value of the current to be supplied to the motor so that the maximum value is less than the reference current value when the maximum value of the load torque detected by the load torque detector is greater than a maximum motor output due corresponding to the reference current value.