ZHPWT | Mirror-finish winding machine for motor coils in irregularly shaped sensors

Non-standard sensor motor coils refer to custom-designed coils that break away from traditional regular geometric shapes such as circles and rectangles, and are specifically engineered to meet specific spatial constraints, magnetic field optimization requirements, or functional integration needs. These coils were developed primarily to meet the stringent demands of modern industry for miniaturized equipment, high integration, high precision, and adaptability to extreme environments. They are widely used in specialty motors (brushless hollow cup motors, disc motors/axial flux motors, linear and swing motors); precision industrial sensors (eddy current displacement sensors, rotary transformers, automotive-grade sensors); and various precision automation equipment, as well as in the medical and aerospace sectors.

I. Features of Special-Shaped Sensor and Motor Coils

1. High Structural Space Adaptability

The coil’s shape can feature three-dimensional curves, saddle shapes, cup shapes, flat profiles with varying wall thicknesses, or even irregular involute structures. This allows for seamless integration into extremely compact, irregular motor slots or sensor housings, maximizing space utilization.

2. Precise Magnetic Field Modulation and High Sensitivity

By precisely designing the path and geometry of each coil turn, the magnetic field distribution can be “customized.” In sensors, this significantly eliminates interference signals from unwanted directions, enhancing sensing sensitivity and linearity in the target direction; in motors, it effectively reduces cogging torque and magnetic harmonics, resulting in smoother operation.

3. Manufacturing Processes and Material Dependencies

These coils typically cannot be processed directly using standard winding machines. They often rely on six-axis CNC winding machines, ultrasonic welding, precision compression molding, or the direct use of self-adhesive enameled wire set by heat or solvents. The internal arrangement of the coils is extremely dense, resulting in high overall rigidity and exceptional resistance to vibration and impact.

4. High Integration (Multi-Functionality)

The custom design often allows for the direct integration of sensor chips (such as Hall effect sensors or temperature sensors) or connectors within the coil or along its edges. This reduces the number of components and assembly steps, while lowering contact resistance and minimizing potential failure points.

Project

Details

Product

Recently, through a client referral, our company had the privilege of participating in the R&D and manufacturing of a mirror-finish winding machine for non-standard sensor motor coils. By leveraging modern coil manufacturing techniques and standardized processes, we have achieved automated coil processing while enhancing product consistency. The specific key features are as follows:

1. Workflow:

Manual placement of the coil onto the loading fixture → Start → Automatic completion of lead-end reservation, precision winding, interlayer adhesive application, and tape wrapping for finishing → Automatic unloading into the loading tray, completing one cycle;

2. Operating Principle:

A three-axis (XYZ) motion structure drives the spindle to perform actions such as wire routing, loading/unloading, tape wrapping, and wire cutting. Adhesive is automatically dispensed via flow-controlled dispensing;

3. Control System:

Utilizes a motion controller developed in-house by our company based on the ADM architecture, paired with a touchscreen HMI. Features include teach-in programming, data storage/retrieval, status monitoring, and fault alerts. Extended functions such as remote PC program storage, equipment status monitoring, and management can be customized as needed;

4. Key Features:

Wire scanning and alignment: By setting a base spacing, the system first scans the wire using a camera to monitor its angle and position in real time. Based on this feedback, the system automatically adjusts the laying speed to compensate for cumulative wire tolerances, resulting in tighter and flatter wire laying;

5. Functional Configuration:

By adjusting the target wire tension value, the system achieves two-stage automatic tension control with real-time tension display, facilitating monitoring and coil process management. Consistent tension prevents wire damage and breakage; combined with precise wire alignment, this ensures higher coil consistency;

The special-shaped sensor motor coil is essentially a technological achievement that “trades manufacturing complexity for performance limits.” It sacrifices the manufacturing convenience of traditional coils in exchange for extreme space compression, perfect magnetic field distribution, and unparalleled system integration. It serves as a critical foundational component for the transformation of industrial precision manufacturing toward digitalization and high-end applications.

About ZHPWT

Guangdong Zongheng Technology Co., Ltd. has dedicated 19 years to the R&D and intelligent manufacturing of precision winding machines for hollow coils, Alpha coils, voice coils, and similar components. Our equipment is widely utilized across various sectors, including smartphones, 3C electronics, new energy vehicles, home appliances, aerospace and defense, nuclear power, and marine engineering. For more details, Contact us: +86-186 2185 7689/Email:tech@zhpwt.com.