DC Link Voltage Control to Reduce Motor Magnetic Harmonics

The patent applies dynamics by making the DC link voltage adjustable rather than fixed. The voltage source varies the DC link voltage dynamically based on motor operating conditions, allowing optimization of the voltage level to reduce magnetic losses while maintaining required power output. This resolves the contradiction by enabling adaptive voltage control that balances power delivery with loss minimization.

The patent changes the voltage parameter of the DC link adaptively. By modifying the DC link voltage level according to motor speed and load conditions, the system optimizes the balance between power output and magnetic losses. This parameter change approach allows the system to operate at lower voltages when full power is not needed, thereby reducing harmonic content and associated magnetic losses.

The patent applies self-service by using the existing voltage source to perform the harmonic reduction function. Instead of adding separate filter components, the voltage source itself adjusts its output to minimize harmonics and magnetic losses. This eliminates the need for additional filtering hardware while achieving the desired loss reduction, thereby avoiding increased device complexity.

The voltage source is given multiple functions: it provides power to the motor and simultaneously performs harmonic reduction to minimize magnetic losses. By making the voltage source multi-functional, the patent eliminates the need for separate filter components, thus reducing device complexity while still achieving loss reduction.