Selectable Hard Start Capacitor Unit for On-Site Capacitance Matching
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Solution Overview
Problem
The challenge of replacing a failed hard start capacitor in single phase induction motors, commonly used in air conditioners and cooling equipment, is complicated by the variety of brands and sizes of units, requiring repairmen to carry multiple replacement parts and delaying repairs.
Innovation Solution
A hard start capacitor replacement unit with selectable capacitance values, adaptable to various motor types, featuring a cylindrical container with multiple capacitors and an electronic relay, allowing on-site configuration to match the required capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If repairmen carry multiple replacement parts for different hard start capacitors, then they can service various motor types, but the device complexity and inventory requirements increase
Solution Approach 1:
The hard start capacitor replacement unit is designed with a universal structure that can adapt to multiple motor types through selectable capacitance values. The unit contains multiple capacitors with different capacitances (e.g., 70 µF, 80 µF, 90 µF, 100 µF) that can be selected based on the specific motor requirements, allowing a single replacement unit to serve multiple applications rather than requiring separate units for each motor type.
Solution Approach 2:
The replacement unit is segmented into multiple discrete capacitor elements with different capacitance values, each accessible through a removable cover. This segmentation allows the repairman to select and connect only the required capacitance value for the specific motor being serviced, reducing the need to carry complete sets of different replacement units.
2Manufacturing precision
If repairmen return to a shop or parts distributor to obtain correct replacement parts, then they ensure proper capacitance matching, but the repair time and productivity decrease
Solution Approach 1:
The replacement unit is pre-configured with multiple capacitors of different capacitance values already assembled in a single housing, with identification markings indicating the capacitance of each capacitor. This preliminary preparation allows the repairman to immediately select the correct capacitance value on-site without needing to return to a parts distributor, thus maintaining precision while improving productivity.
Solution Approach 2:
The replacement unit incorporates a dynamic selection mechanism where the repairman can choose different capacitance values based on the specific motor requirements. The unit includes a removable cover that provides access to multiple capacitors, and wire means that can be configured to connect the appropriate capacitor, enabling flexible adaptation to different repair scenarios.
3Ease of operation
If a single replacement unit serves multiple motor types, then the ease of operation improves, but the device complexity increases due to multiple capacitors and selection mechanisms
Solution Approach 1:
The design allows the repairman to extract or access individual capacitors through a removable cover, selecting only the required capacitance value for the specific application. The wire means can be disconnected and reconnected to different capacitors, allowing the essential functional element to be extracted and adapted without carrying multiple complete replacement units.
Solution Approach 2:
The replacement unit serves as an intermediary device that bridges the gap between having multiple separate replacement units and carrying a single unit. It provides a centralized housing containing multiple capacitors with identification markings, and includes wire means and connection terminals that mediate between the selected capacitor and the motor, simplifying the selection and connection process.
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
Enables efficient on-site repair of hard start capacitors without the need for returning to a parts distributor, ensuring timely restoration of cooling systems.
Implementation Method 1
A relay has a contact and means for opening and closing said contact in response to voltage across start and run windings of a single phase electric motor
Implementation Method 2
A plurality of capacitors are provided within the container, each of said capacitors having a capacitance value
Data Source
AI summary
A hard start capacitor replacement unit has a plurality of capacitors in a container sized to fit in existing hard start capacitor space. The capacitors are 4 metallized film capacitors wound in a single cylindrical capacitive element. The container has a common terminal and capacitors value terminals for the plurality of capacitors, which may be connected singly or in combination to provide a selected capacitance. An electronic or other relay connects the selected capacitance in parallel with a motor run capacitor. The hard start capacitor replacement unit is thereby adapted to replace a wide variety of hard start capacitors.