Dual-Spindle Circular Saw With Direct-Drive Spindle Motor
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Solution Overview
Problem
Dual-spindle circular saws face limitations in cutting height due to the circular saw blades' maximum useful diameter, requiring complex designs and high alternating loads on the saw spindle, which affects cutting accuracy and efficiency.
Innovation Solution
The armature is fixed to the saw spindle, and the stator is positioned between a fixed and floating bearing in the housing, allowing for direct motor mounting on the saw spindle, eliminating external drives and enabling precise, efficient cutting with a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If external belt drives are used to transmit power to the saw spindle, then the motor power can be transmitted, but the saw spindle is subjected to very high alternating loads which affects cutting accuracy and requires larger bearings that are not suitable for required speeds
Solution Approach 1:
The motor is merged with the saw spindle by directly coupling the armature to the spindle shaft, eliminating the belt drive system. This integration removes the source of high alternating loads while maintaining power transmission capability, thereby improving cutting accuracy without sacrificing motor power.
Solution Approach 2:
The belt drive system is extracted/removed from the design. By eliminating the external belt drives, the harmful alternating loads are removed, allowing the use of smaller, high-speed bearings while maintaining adequate power transmission through the direct motor coupling.
2Power
If the motor outer diameter is increased to provide sufficient power, then more power can be transmitted, but the circular saw blade diameter must be at least this large which increases the cutting height limitation
Solution Approach 1:
The motor is merged into the saw spindle assembly with the armature directly coupled to the spindle. This allows the motor to be positioned within the blade diameter envelope, enabling high power transmission without increasing the circular saw blade diameter, thus maintaining flexibility in cutting height adjustments.
3Force
If belt drives with two belts offset by 180 degrees are used, then the high alternating loads can be managed, but the design becomes very complex weighing about 5 metric tons with cutting accuracy of less than 0.1 mm
Solution Approach 1:
The complex dual belt drive system is extracted and replaced with a direct motor coupling. This eliminates the need for offset belts and associated complexity while maintaining adequate control over loads through the rigid direct connection between motor and spindle.
Solution Approach 2:
The motor and saw spindle are merged into a single integrated unit, eliminating the separate belt drive system. This consolidation dramatically reduces system complexity and weight while maintaining the capability to manage loads through the direct mechanical connection.
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 configuration allows for clean cutting within narrow tolerances, reduces mechanical stress on the saw spindle, and enhances tool change efficiency, while also improving the sawing machine's overall efficiency by approximately four percent compared to prior art.
Implementation Method 1
each saw group has a drive, comprising an armature and a stator, for the rotary driving of a saw spindle
Data Source
AI summary
A dual-spindle circular saw (1) for sawing wood (2) with two saw groups (3) is proposed, wherein each saw group (3) comprises a drive (7) having an armature (5) and a stator (6) for rotary driving of a saw spindle (9) which is mounted in a housing (8) and which is connected in a rotationally fixed manner to at least one saw tool (11) comprising at least one exchangeable circular saw blade (10), and wherein the center distance (A) of the saw spindles (9) is adjustable by an actuator. In order to create particularly advantageous design conditions, it is proposed that the armature (5) is arranged in a rotationally fixed manner on the saw spindle (9) and the stator (6) is arranged in a rotationally fixed manner in the housing (8) between a fixed bearing (13) and a floating bearing (14) of the saw spindle (9), wherein the saw tool (11) is floatingly mounted on the saw spindle (9).