Magnetic Drill Press Alternate Power Circuit
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Solution Overview
Problem
Magnetic drill presses face issues with motor inertia causing unintended movement and drill bit breakage when the power supply is unexpectedly interrupted, leading to the electromagnet de-energizing.
Innovation Solution
Incorporating an alternate power supply circuit with a battery and detector that monitors the DC voltage output by an AC/DC converter, providing a backup DC voltage to the electromagnet when the primary power source is absent, ensuring continuous magnetic coupling and stability during drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electromagnet is powered only by the primary AC power source, then the device complexity is low, but the reliability deteriorates when power is interrupted
Solution Approach 1:
The battery is pre-charged and positioned in the circuit as a standby power source before any power interruption occurs. The detector is continuously monitoring the DC voltage from the AC/DC converter, ready to switch to battery power immediately when the primary power fails, ensuring no interruption in electromagnetic coupling.
Solution Approach 2:
The detector acts as an intermediary between the AC/DC converter and the battery, monitoring the DC voltage and controlling the switching between power sources. When the detector senses voltage drop below a threshold, it automatically activates the battery circuit, providing seamless power transition without requiring complex control systems.
2Object-affected harmful factors
If the electromagnet is de-energized when AC power is removed, then the energy consumption is reduced, but the harmful effects increase due to drill press movement and drill bit breakage
Solution Approach 1:
The system converts the harmful effect of sudden power loss (which causes drill press movement and drill bit breakage) into a beneficial outcome by using the battery to maintain electromagnetic coupling during the brief transition period. The detector identifies the power loss condition and activates the battery, transforming what would be a harmful interruption into a controlled, seamless power transition that protects the drill bits and workpiece.
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
Prevents drill bit breakage by maintaining magnetic attachment to the work surface even when the primary power source is interrupted, ensuring safe and reliable operation of the magnetic drill press.
Implementation Method 1
a AC/DC converter configured to receive the AC input signal and, independent from the controller and in the presence of the AC input signal, to output the DC voltage to the electromagnet
Implementation Method 2
an electromagnet arranged in a base of the drill housing and powered by a DC voltage, to magnetically couple the base to the surface
Implementation Method 3
an alternate power supply circuit that monitors the DC voltage output by the converter and, in the absence of the DC voltage, provides an alternate DC voltage to the electromagnet
Data Source
Figure 1
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Figure 3
AI summary
A magnetic drill (10) is provided with an alternate power source (36). The drill (10) comprises: an electric motor (32) for driving a tool; a controller (33) configured to receive an AC input signal and operable to control a drive signal to the electric motor (32); an electromagnet (28) arranged in a base (24) of the drill housing and operable, in response to a DC voltage, to magnetically couple the base to a surface proximate to the base (24); an AC/DC converter (34) configured to receive the AC input signal and operates, independent from the controller (33) and in the presence of the AC input signal, to output a DC voltage to the electromagnet (28); and an alternate power source circuit that monitors the DC voltage output by the converter (34) and, in the absence thereof, provides an alternate DC voltage to the electromagnet (28).