Motor Driving Control Device for Silent Start Voltage Protection
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Solution Overview
Problem
Motor driving control devices face issues with excessive power supply voltage due to regenerative currents generated during slow start operations, particularly when motors are rotated by inertia or disturbance, which can damage the driving circuit if not properly managed.
Innovation Solution
A motor driving control device with a simple circuit configuration that includes a rotation detecting unit, drive detecting unit, command acquiring unit, state determining unit, and control unit to determine if a slow start operation is feasible, generating appropriate command information to prevent power supply voltage increases by controlling the motor's driving signal based on its rotating and driving states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the motor performs slow start operation while rotated by inertia or disturbance, then the motor can start silently by gradually increasing rotating speed, but regenerative current is generated causing power supply voltage to become excessive and potentially damaging the driving circuit
Solution Approach 1:
The control device determines the motor's rotating state and driving state before initiating slow start operation. By checking whether the motor is already rotating due to inertia or disturbance, the system prepares appropriate control signals in advance to prevent regenerative current issues before they occur.
Solution Approach 2:
The invention converts the potentially harmful regenerative current situation into a beneficial outcome by detecting when the motor is already rotating and adjusting the slow start control accordingly. This allows the system to maintain silent start capability while preventing voltage excessive increase that would damage the driving circuit.
2Reliability
If a control device suppresses power supply voltage increase by detecting motor state and controlling slow start operation, then driving circuit damage is prevented, but the circuit configuration becomes complex requiring additional detection and switching circuits
Solution Approach 1:
The control device integrates multiple functions into a unified control mechanism. The same control unit that manages normal motor operation also detects the rotating state and driving state, and adjusts slow start operation accordingly. This eliminates the need for separate detection circuits and switching mechanisms, maintaining reliability while avoiding increased complexity.
Solution Approach 2:
The control device uses its existing resources to protect itself. By utilizing the same control unit and existing sensor inputs to detect motor state and adjust slow start operation, the system achieves self-protection without requiring external protective circuits or additional hardware components.
Data Source
AI summary
There is provided a motor driving control device including a state determining unit which determines whether a motor can perform a slow start operation based on a rotating state and a driving state of the motor, a control unit which generates command information corresponding to a speed at which the motor is to be rotated, based on a determination result of the state determining unit, and a motor driving unit which outputs a driving signal corresponding to the command information generated by the control unit to the motor so as to drive the motor. When it is determined that the motor can perform the slow start operation, the control unit generates the command information such that the motor performs the slow start operation.