Stand Mixer Cooling Fan Decoupled From Motor for Low-Speed Heat Control
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Solution Overview
Problem
Stand mixers face issues with motor heat generation, leading to performance degradation and potential premature failure. Existing cooling fan designs are inefficient at low motor speeds and only operate when the mixer is in use.
Innovation Solution
A stand mixer with an independent cooling fan that operates separately from the motor assembly, providing continuous cooling through a separate fan shaft and allowing for independent control of the cooling fan's speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling fan is attached to the motor driveshaft, then the motor is cooled during operation, but the cooling ability is limited at low motor speeds
Solution Approach 1:
The cooling fan is separated from the motor driveshaft and operated independently. The fan shaft is distinct from the motor shaft, allowing the cooling fan to operate at different speeds and times than the motor, thereby maintaining effective cooling even when the motor runs at low speeds.
Solution Approach 2:
The cooling fan speed can be dynamically adjusted independently from the motor speed. The system can operate the cooling fan at higher speeds during low motor speed operations to maintain adequate cooling, and the fan can continue running briefly after motor shutdown to dissipate residual heat.
2Device complexity
If the cooling fan is attached to the motor driveshaft, then the structure is simple, but the cooling fan can only operate when the motor is operated
Solution Approach 1:
The cooling fan is segmented as a separate component with its own shaft and control, independent of the motor driveshaft. This allows the cooling fan to be operated separately from the motor, enabling cooling continuation after motor shutdown and cooling operation during motor idle periods.
Solution Approach 2:
The cooling fan can be operated in advance before motor startup and continue running briefly after motor shutdown. This preliminary and extended cooling action ensures the motor is cooled before heavy loads and continues to dissipate heat after operation ceases.
3Force
If the motor operates at high torque load, then mixing performance is improved, but excessive heat is produced leading to motor degradation
Solution Approach 1:
The cooling fan operates in advance before high torque loads are applied to the motor. By pre-cooling the motor, the system prevents heat buildup during subsequent high torque operations, maintaining motor reliability and performance stability under heavy loads.
Solution Approach 2:
The cooling fan provides continuous cooling action during high torque motor operation. Since the fan operates independently, it can maintain full cooling capacity throughout the duration of high torque loads, ensuring continuous heat dissipation and preventing motor degradation.
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 independent cooling fan effectively manages motor heat across various operating conditions, enhancing motor performance, reducing the risk of failure, and providing continuous cooling even when the mixer is not in use.
Implementation Method 1
a cooling fan provided adjacent to the air inlet, the cooling fan being rotatable about a fan shaft... provides a cooling flow of air over the motor
Data Source
AI summary
A stand mixer includes a casing forming a base, a column extending from the base, and a motor housing connected to the column, the casing including an air inlet and an air outlet; a motor assembly provided within the motor housing, the motor assembly including a motor shaft; and a cooling fan provided adjacent to the air inlet, the cooling fan being rotatable about a fan shaft. The fan shaft is separate from the motor shaft and the cooling fan is operated independently from the motor assembly.