Motor Control Apparatus Dynamic Switching Cycle
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Solution Overview
Problem
Synchronous motors with constant current supply switching cycles experience prolonged operating times due to constant rotor rotation speed, leading to delays in reaching target positions.
Innovation Solution
A motor control apparatus that adjusts the current supply switching cycle based on the torque margin, calculated as the difference between output torque and load torque, to increase rotor speed while preventing synchronism loss, thereby reducing the time required to reach target positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the current supply switching cycle is shortened to increase rotor speed, then the operating time is reduced, but the risk of synchronism loss increases
Solution Approach 1:
The patent applies dynamics by making the current supply switching cycle variable rather than constant. The cycle period is dynamically adjusted based on the detected rotor position and speed, allowing the system to optimize performance while maintaining stability. Specifically, the switching cycle is shortened when the rotor is far from the target position to reduce operating time, and lengthened when approaching the target position to prevent synchronism loss.
Solution Approach 2:
The patent changes the parameter of current supply switching cycle from a fixed value to a variable value that changes based on operating conditions. The control apparatus detects rotor position and speed, then adjusts the switching cycle period accordingly - using shorter periods for faster rotation and longer periods for precise positioning, thereby resolving the contradiction between speed and synchronism maintenance.
2Device complexity
If the current supply switching cycle remains constant, then the control is simple, but the rotor speed cannot be optimized and operating time increases
Solution Approach 1:
The patent implements dynamic control where the switching cycle is automatically adjusted based on real-time rotor position and speed detection. This dynamic approach optimizes the operating time by using shorter switching cycles when the rotor is far from the target and longer cycles when接近 the target, while maintaining manageable control complexity through automated feedback control.
3Speed
If the current supply switching cycle is shortened, then the rotor speed increases, but the torque margin may become insufficient causing synchronism loss
Solution Approach 1:
The patent changes the switching cycle parameter dynamically based on the torque margin and rotor state. When the rotor is far from the target position and has sufficient torque margin, the switching cycle is shortened to increase speed. When the rotor approaches the target position or the torque margin becomes small, the switching cycle is lengthened to maintain synchronism, thus preventing synchronism loss while optimizing speed.
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
The dynamic adjustment of the current supply switching cycle shortens the operating time of the motor by allowing for faster rotor position alignment and preventing synchronism loss, even when the cycle is shortened.
Implementation Method 1
a rotor that rotates upon receiving a magnetic force caused by a rotation magnetic field generated by sequentially switching a current supply phase of the coils
Data Source
AI summary
A motor control apparatus includes a counter, a margin calculation portion, and a cycle set portion. The counter counts a total number of switching the current supply phase of the coils when the rotor is rotationally driven. A rotation angle of the rotor is detected on a basis of the number of switching. The margin calculation portion calculates a torque margin that is a difference between an output torque of the motor and a load torque acting on the motor. The cycle set portion sets a current supply switching cycle to shorten as the torque margin is greater. The current supply switching cycle is a cycle switching the current supply phase of the coils.