AC Linear Motor Set Synchronization via Phase Current Difference
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Solution Overview
Problem
Existing methods fail to effectively control a group of AC linear motors of identical specifications to operate as a single motor with desired power, requiring new development and increased time and effort as required power increases.
Innovation Solution
The method involves firmly connecting AC linear motors with identical pole pitches and intervals, designating one as a master motor, and using feedback signals and current difference information to control the motor set, with a system including driving current supply parts, a protecting/monitoring part, and a control command part to ensure synchronized operation and prevent burnout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single linear motor is designed to meet higher power requirements, then the required power is increased, but the development time and effort increase significantly
Solution Approach 1:
The invention divides the high-power linear motor requirement into multiple standard-power linear motors (e.g., two motors for double power, three motors for triple power). Each motor operates within its standard power range, avoiding the need to design and develop a new high-power motor from scratch. This segmentation allows using off-the-shelf standard motors while achieving the desired total power output.
Solution Approach 2:
The invention combines multiple standard linear motors into a unified driving system by connecting their drive circuits in parallel and synchronizing their operation through a single control unit. The merged system operates as a single high-power linear motor, eliminating the need for separate development of each motor while achieving the required power level.
2Power
If multiple linear motors of different specifications are driven synchronously, then the desired power is achieved, but the control complexity increases
Solution Approach 1:
The invention uses a single drive circuit that can simultaneously control multiple linear motors of identical specifications. The drive circuit is designed to output drive signals that are distributed to multiple motors, allowing one circuit to perform the function of driving multiple motors synchronously. This universal approach simplifies the control system compared to using separate drive circuits for each motor.
Solution Approach 2:
The invention creates identical copies of the drive signal and distributes them to multiple linear motors. By using the same drive circuit configuration and control parameters for each motor, the system ensures synchronized operation without requiring complex individual control strategies for each motor.
3Loss of time
If standard linear motors are combined to achieve desired power, then development time is reduced, but the motors must be precisely synchronized
Solution Approach 1:
The invention incorporates feedback mechanisms where the drive circuit monitors the operation status of each linear motor and adjusts the drive signals accordingly. This feedback ensures that all motors remain synchronized during operation, maintaining reliability while using standard motors that can be quickly deployed.
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 approach allows multiple AC linear motors to be combined into a single motor set with desired power, ensuring accurate monitoring and double protection against burnout, thereby efficiently meeting power requirements.
Implementation Method 1
there are used AC linear synchronous motors, AC linear induction motors and the like (hereinafter referred to as linear motors). Such a linear motor is structured to have excitation coils of copper wire wounded on a stator or a mover and energize the excitation coils with exiting current to cause driving power, thereby enabling linear movement.
Data Source
AI summary
Provided is a method for controlling a plurality of AC linear motors of identical specifications which are connected each other and operated synchronously so that they appear to operate as a single linear motor having desired power.The method for controlling, as an AC linear motor set, a plurality of AC linear motors of identical specifications which are connected to each other, includes the steps of firmly connecting the AC linear motors in such a manner that pole pitches of movers of the AC linear motors and pole intervals of adjacent movers are identical; and setting any one of the AC linear motors to be a master AC linear motor and using a command signal generated based on a feedback signal of the master AC linear motor and current difference information obtained by comparing phase current of the master AC linear motor with phase current of another AC linear motor to control the AC linear motor set.