Motor Power Electronics Using Clock Signals for Rotor Heating
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Solution Overview
Problem
Existing power electronics for electric motors increase complexity and computing requirements by selectively superimposing harmonics on alternating current voltage to control temperature, leading to undesirable inefficiencies and increased hardware demands.
Innovation Solution
Utilizing clock signals to generate a square-wave alternating current voltage that heats the rotor and stator of the electric motor, asynchronously inducing flux harmonics to efficiently heat the rotor without additional harmonic superposition, allowing heating at any operating point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If additional harmonics are selectively superimposed on the alternating current voltage to control temperature, then temperature control precision is improved, but device complexity and computing requirements increase
Solution Approach 1:
The patent changes the control parameter from selective harmonic superposition to clock signal frequency modulation. By varying the clock signal frequency and duty cycle, the system achieves temperature control without requiring complex harmonic calculation and superposition circuits, thus reducing device complexity while maintaining control precision.
Solution Approach 2:
The patent replaces the complex electrical system of harmonic superposition with a simpler clock signal-based control mechanism. The clock signal controls the switching of power semiconductor devices, which generates the necessary magnetic flux variations to heat the rotor, eliminating the need for complex harmonic generation circuits.
2Temperature
If additional harmonics are selectively superimposed on the alternating current voltage, then temperature control capability is improved, but computing power and memory space requirements increase
Solution Approach 1:
The clock signal automatically generates the necessary control patterns for power semiconductor switching. The system uses the rotor's own rotational position feedback to synchronize the clock signal, creating a self-regulating temperature control mechanism that requires minimal external computing intervention.
3Power
If clock signals are used to generate square-wave alternating current voltage, then heating efficiency is improved, but temperature control precision may be reduced
Solution Approach 1:
The patent dynamically adjusts the clock signal parameters (frequency and duty cycle) based on real-time temperature feedback and rotor position. This dynamic adaptation allows the system to maintain high heating efficiency while achieving precise temperature control through continuous parameter optimization.
Solution Approach 2:
The system incorporates temperature sensors and rotor position detectors that provide feedback to the control unit. The control unit uses this feedback to adjust the clock signal characteristics, ensuring that high heating efficiency is maintained while preventing overheating and achieving the desired temperature precision.
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 method effectively heats the rotor and stator of the electric motor, reducing inefficiencies and hardware demands by using clock signals, which can be applied across various operating points without additional harmonic superposition, thus enhancing temperature control and efficiency.
Implementation Method 1
The power electronics generates an alternating current voltage that is supplied to the electric motor. The supply of a square-wave alternating current voltage is usually referred to as clock signals.
Implementation Method 2
During operation, the electric motor inevitably generates heat in components of the electric motor by means of a magnetic flux.
Data Source
AI summary
A method for operating an electric motor is provided which includes power electronics of a drive system operating an electric motor of the drive system using clock signals, as well as power electronics for a drive system and a vehicle.