Electric Hoisting Machine Capacitor Housing Design
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Solution Overview
Problem
Electric chain blocks using single-phase induction motors face issues with large capacitor sizes, leading to increased machine size and man-hours for attachment, especially when high starting torque is required.
Innovation Solution
The design incorporates a single-phase motor with a main winding and auxiliary winding, where a starting capacitor and operating capacitor are connected in series with the auxiliary winding, and a disconnecting switch is used to manage their operation, all housed in a compact cylindrical configuration that attaches to the motor housing, reducing overall size and attachment time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a single-phase induction motor with starting capacitor and operating capacitor is used, then the motor can provide sufficient starting torque, but the machine size increases due to large capacitor sizes
Solution Approach 1:
The patent arranges the capacitors and disconnecting switch in a radial configuration around the motor shaft, utilizing the radial dimension rather than extending the machine in linear directions. The housing includes a first cavity for the starting capacitor, a second cavity for the operating capacitor, and a third cavity for the disconnecting switch, all positioned radially around the motor to minimize the machine's external dimensions while accommodating all necessary components.
2Force
If large capacitance starting capacitor is used for large starting torque, then the starting torque requirement is met, but the machine size increases further
Solution Approach 1:
The patent combines the starting capacitor, operating capacitor, and disconnecting switch into a single integrated housing structure that attaches to the motor. This merging of components into one compact assembly reduces the overall machine size compared to having separate components, while still providing the large capacitance needed for high starting torque through the starting capacitor.
3Adaptability or versatility
If starting capacitor and operating capacitor are attached to the electric chain block, then the single-phase motor can operate, but the attachment process requires increased man-hours
Solution Approach 1:
The starting capacitor, operating capacitor, and disconnecting switch are integrated into a single housing assembly that attaches to the motor as one unit. This eliminates the need for separate attachment operations for each component, significantly reducing installation time and manual labor while maintaining full operational capability of the single-phase motor.
Solution Approach 2:
The capacitors and disconnecting switch are pre-assembled into a complete housing unit before attachment to the motor. This preliminary assembly means that during installation, the entire capacitor assembly can be attached in one operation rather than installing each component separately, reducing attachment time and ensuring proper configuration.
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 configuration prevents size increases and reduces man-hours for attaching capacitors, allowing the electric hoisting machine to maintain a similar size to three-phase induction motor systems while providing adequate starting torque.
Implementation Method 1
a starting capacitor electrically connected in series with the auxiliary winding of the motor; an operating capacitor electrically connected in series with the auxiliary winding of the motor
Data Source
AI summary
This electric hoisting machine comprises: a motor driven by single-phase current; a cylindrical motor housing; a starting capacitor; a operating capacitor; a starting capacitor disconnecting switch; a control unit which controls the operation of the motor and which is covered by a control housing; and a housing case in which small-diameter cylindrical portions for accommodating the starting capacitor, a large-diameter cylindrical portion for accommodating the operating capacitor, and a large-diameter cylindrical portion for accommodating the starting capacitor disconnecting switch are integrally provided in a state of continuing in a horizontal row, the housing case being mounted on the outer periphery of the motor housing in such a manner that the cylindrical portions are oriented parallel to a rotation axis.