Refrigeration Compressor Field-Oriented Drive for Startup Torque
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Solution Overview
Problem
Domestic refrigeration appliances with permanently excited three-phase synchronous motors face challenges in achieving improved start-up response and torque generation, as existing control methods do not effectively utilize the longitudinal current to enhance overall torque during startup.
Innovation Solution
A domestic refrigeration appliance with a field-oriented controller and a permanently excited three-phase synchronous motor, where a second current control circuit adjusts the longitudinal current target value from 'zero' to a predetermined value within a specific time period, generating additional torque to increase the overall torque of the motor, and a speed control circuit sets the target speed based on cooling requirements for improved start-up response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the longitudinal current target value is adjusted from zero to a predetermined value during startup, then the overall torque of the motor is increased, but the control complexity increases
Solution Approach 1:
The control device determines a longitudinal current target value profile in advance before motor startup, defining how the longitudinal current target value changes over time from zero to a predetermined value. This preliminary preparation allows the motor to generate additional torque during startup without requiring complex real-time calculations, as the current profile is pre-determined and ready for implementation.
2Speed
If the longitudinal current target value is adjusted dynamically during startup, then the start-up response is improved, but the control circuit complexity increases
Solution Approach 1:
The longitudinal current target value profile is determined in advance, specifying the exact trajectory of longitudinal current adjustment during startup. This pre-planned approach enables improved start-up response because the control system simply follows the predetermined profile rather than calculating optimal current values in real-time, thereby avoiding increased control circuit complexity.
3Productivity
If the longitudinal current generates additional torque, then the cooling performance is improved, but the energy consumption increases
Solution Approach 1:
The longitudinal current target value is adjusted dynamically over time according to a predetermined profile during startup, rather than being maintained at a constant high value. The profile defines how the current evolves from zero to a predetermined value and subsequently returns to zero, allowing the system to generate additional torque only when needed during startup to improve cooling performance, while minimizing energy consumption during normal operation.
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
The solution enhances the start-up response and overall torque of the compressor by dynamically adjusting the longitudinal current, allowing for more efficient cooling of the interior chamber with reduced computational power and robust electric drive operation.
Implementation Method 1
a permanently excited three-phase synchronous motor, which is connected downstream of the converter and which is part of the compressor or is provided to drive the compressor
Data Source
AI summary
A domestic refrigeration device and a method for operating a domestic refrigeration device. The domestic refrigeration device has a heat-insulated body with a coolable inner container which delimits a coolable interior provided for storing food. A coolant circuit is provided for cooling the coolable interior and includes a compressor and a field-oriented electric drive. The field-oriented electric drive has a field-oriented controller, a converter, and a permanently excited synchronous motor which is connected downstream of the converter and which is part of the compressor or is provided for driving the compressor.