Motor Drive Carrier Frequency Adjustment for Y-Delta Efficiency
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Solution Overview
Problem
Conventional motor driving technologies face inefficiencies due to the inability to adjust the carrier frequency optimally for both Y connection and delta connection conditions, affecting motor efficiency.
Innovation Solution
A driving device that dynamically adjusts the carrier frequency based on the coil connection condition, using a control system to set distinct carrier frequencies for Y connection and delta connection to optimize motor efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single carrier frequency is used for PWM control, then the control system is simple, but it is impossible to optimize efficiency for both Y connection and delta connection conditions
Solution Approach 1:
The patent applies dynamics by making the carrier frequency adjustable rather than fixed. The control system dynamically changes the carrier frequency based on the detected coil connection condition (Y or delta connection), allowing optimization of motor efficiency for each connection mode while maintaining reasonable system complexity through automated adaptation.
Solution Approach 2:
The patent changes the carrier frequency parameter according to the coil connection condition. By detecting whether the motor coils are connected in Y or delta configuration, the system adjusts the carrier frequency to optimal values for each connection type, thereby resolving the contradiction between using a single frequency and optimizing for both connection modes.
2Loss of energy
If the carrier frequency is adjusted to optimize efficiency for one connection condition, then efficiency for that condition improves, but efficiency for the other connection condition deteriorates
Solution Approach 1:
The system dynamically adapts the carrier frequency based on the detected connection condition. When Y connection is detected, one optimal frequency is applied; when delta connection is detected, a different optimal frequency is applied. This dynamic adaptation resolves the contradiction by making the system versatile across different connection conditions while maintaining high efficiency in each mode.
Solution Approach 2:
The patent employs feedback by detecting the actual coil connection condition and using this information to adjust the carrier frequency accordingly. The control system continuously monitors the connection state and modifies the PWM carrier frequency to match the optimal frequency for the detected configuration, ensuring high efficiency regardless of whether Y or delta connection is active.
Data Source
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AI summary
A driving device (100) includes a connection switching unit (60) that switches connection condition of a coil (3) between Y connection and delta connection, an inverter (103), and a control device (50) that controls a carrier frequency of the inverter (103). The carrier frequency is set at a first carrier frequency when the connection condition of the coil (3) is the Y connection. The carrier frequency is set at a second carrier frequency when the connection condition of the coil (3) is the delta connection.