Linear Switched Reluctance Motor Sinusoidal Commutation
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Solution Overview
Problem
Conventional linear switched reluctance motors require expensive, tailor-made drives for accurate positioning due to their unique driver topology and non-linear phase inductance variation with position, leading to inferior positioning performance compared to servo motors.
Innovation Solution
A linear switched reluctance motor design utilizing a movable coil bracket with sinusoidally wound coils and a stator track with tooth members, driven by a standard three-phase bridge and sinusoidal commutation algorithm, generating symmetric multiple-phase sinusoidal currents to produce bidirectional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional linear switched reluctance motors use traditional unipolar current-driven topology, then bidirectional forces can be achieved, but the driver topology becomes complex and expensive
Solution Approach 1:
The patent applies universality by enabling a standard three-phase bridge driver to control the linear switched reluctance motor, making the driver topology universal and compatible with conventional motor control systems rather than requiring a specialized expensive driver design
2Ease of operation
If conventional linear switched reluctance motors use non-linear phase inductance variation, then motor operation is achieved, but positioning precision deteriorates
Solution Approach 1:
The patent changes the electrical parameters by using sinusoidal current waveforms instead of traditional unipolar currents, and employs flux weakening techniques to linearize the magnetic circuit operation, thereby improving positioning precision while maintaining ease of operation
3Ease of operation
If conventional linear switched reluctance motors use non-linear current relationships, then motor function is achieved, but control difficulty increases
Solution Approach 1:
The patent substitutes the complex non-linear control system with a simplified sinusoidal commutation algorithm, replacing the need for complex real-time control calculations with a more straightforward control approach that maintains motor function while reducing control difficulty
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 design allows for cost-effective driving and accurate positioning using standard motion controllers and motor drivers, reducing costs and enabling the motor to replace linear permanent magnet motors without hardware modifications.
Implementation Method 1
a magnetic flux path is created which passes through the motor coil core, the stator track and an air gap between the motor coil core and the stator track
Implementation Method 2
a switched reluctance motor which provides linear bidirectional driving forces using switched or variable reluctance principles
Data Source
AI summary
A linear switched reluctance motor comprises a movable coil bracket including first and second coil assemblies. Each of the first and second coil assemblies further comprises a plurality of coils separately wound around a plurality of motor coil cores, each of the coils being configured to receive a sinusoidal current at a different phase from other coils comprised in the same coil assembly. Tooth members of a stator track are located adjacent to the motor coil cores such that a magnetic flux path is created which passes through the motor coil core, the stator track and an air gap between the motor coil core and the stator track. A multiple-phase motor driver electrically connected to the first and second coil assemblies generates symmetric multiple-phase sinusoidal currents for driving the motor.