Electric Motor Self-Heating Control for Extreme Cold Startup
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Solution Overview
Problem
Existing heating technologies for extreme environments, such as those found on the Moon or in polar climates, are inefficient and add weight, power, and design complexity due to indirect heating methods and parasitic losses, making it difficult to maintain component functionality.
Innovation Solution
A self-heating electric motor control scheme that uses the motor's intrinsic electromagnetic properties to generate heat through inductive heating, reducing parasitic losses and directly heating components, thereby reducing the need for additional heating components and simplifying thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If indirect heating methods are used to heat components in extreme environments, then components can be heated to operating temperature, but weight, power consumption, and design complexity increase due to additional heating components and parasitic losses
Solution Approach 1:
The motor controller uses the motor windings themselves as the heating element by applying AC power during idle periods. The motor components heat themselves through their own electrical resistance, eliminating the need for separate heating components and reducing system complexity while maintaining effectiveness
Solution Approach 2:
The motor windings serve dual purposes: they function as both the electromagnetic coils for motor operation and as heating elements for thermal management. This multi-functionality eliminates dedicated heating components, reducing weight and design complexity while providing effective heating during idle periods
2Temperature
If indirect heating methods are used to heat components, then components can be heated, but power consumption increases due to parasitic losses in thermal interfaces
Solution Approach 1:
The motor components generate heat internally through their own electrical resistance when AC power is applied. This self-heating approach eliminates parasitic losses associated with thermal interfaces between separate heating elements and motor components, directly heating the target components through their own windings
Solution Approach 2:
The motor windings act as an intermediary that converts electrical energy directly into thermal energy within the motor components themselves. This eliminates the need for separate thermal coupling mechanisms and reduces energy loss through thermal interfaces, improving overall heating efficiency
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
This approach reduces weight, power, and design complexity while efficiently maintaining component temperatures, minimizing heat loss through thermal interfaces, and ensuring reliable operation in extreme conditions.
Implementation Method 1
A self-heating electric motor control scheme that uses the motor's intrinsic electromagnetic properties to generate heat through inductive heating
Implementation Method 2
the heating control scheme is used to heat the electric motor prior to mechanical operation of the electric motor
Data Source
AI summary
Aspects of the present disclosure relate to self-heating electric motor control. In examples, a motor controller includes a normal control scheme and a heating control scheme, whereby the heating control scheme causes the electric motor to produce heat (in addition to or in the absence of mechanical operation of the electric motor). For example, if the electric motor has cooled below a minimum operating temperature, the heating control scheme is used to heat the electric motor prior to mechanical operation of the electric motor. As another example, the electric motor may approach or fall below a minimum operating temperature during operation, such that the heating control scheme is used to cause the electric motor to produce additional heat while in operation. Thus, the electric motor is heated as a result of the heating control scheme, as are one or more associated mechanical or electrical components.