Phase Cut Switch Burnout Prevention in Motor Driven Power Steering
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Solution Overview
Problem
In motor driven power steering apparatuses, phase cut switches can burn out due to stored energy when blocking a broken platform during redundant operations, leading to instability and potential failure.
Innovation Solution
An apparatus comprising a phase cut switch with a MOSFET structure, a gate driving unit, and a current circulation unit, including resistors and a freewheeling diode, to circulate counter electromotive forces and prevent burnout by managing energy flow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a phase cut switch is used to block a broken platform in redundant operation, then the broken platform can be blocked, but the phase cut switch may burn out due to stored energy in the motor coil
Solution Approach 1:
A current circulation unit is introduced as an intermediary component between the phase cut switch and the motor coil. This unit includes a circulation switch and a circulation resistor that provide a safe path for stored energy to dissipate gradually, preventing direct冲击 to the phase cut switch and eliminating the burnout risk while maintaining reliable platform blocking
Solution Approach 2:
Before completely blocking the broken platform by opening the phase cut switch, the system first activates the current circulation unit to discharge the stored energy in the motor coil. This preliminary action ensures that when the phase cut switch opens, no harmful stored energy remains to cause burnout, enabling safe and reliable platform blocking
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
Stably operates the phase cut switch to block broken platforms, preventing burnout and ensuring stable operation during redundant conditions by effectively managing stored energy in the motor.
Implementation Method 1
a current circulation unit configured to circulate a counter electromotive force of the driving motor at an output terminal of the gate driving unit and an output terminal of the phase cut switch
Data Source
AI summary
Provided is an apparatus for operating a phase cut switch in a motor driven power steering apparatus. The apparatus for operating a phase cut switch in a motor driven power steering apparatus includes: a phase cut switch installed for an inverter for converting a voltage into 3-phase power and driving a driving motor and for each phase of input terminals of the driving motor; a gate driving unit configured to receive a driving signal from a control device and operate the phase cut switch; and a current circulation unit configured to circulate a counter electromotive force of the driving motor at an output terminal of the gate driving unit and an output terminal of the phase cut switch.