Electric Motor Having an Iron-Free Winding

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This patent discloses an electric motor design that features an iron-free winding device positioned in the air gap between the primary and secondary parts. In this motor, each phase of the winding is composed of multiple coils connected by short electrical connections, and all the magnetic poles are arranged so they can be utilized simultaneously for force or torque generation. The iron-free windings significantly reduce losses such as eddy current and hysteresis, resulting in a lightweight, highly efficient, and compact motor structure. The configuration can be used for both rotary and linear electric motors, employing either permanent magnets or externally excited magnets.

Use CasesContent extracted from patent full text and abstract with AI.

• Electric vehicle propulsion systems (e.g., e-mobility or wheel-hub motors)
• Robotics and automation tools requiring light and efficient motors
• Medical equipment relying on precise, low-weight motion actuators
• Consumer appliances where efficient, quiet motors are desired
• Aerospace and drones, where weight and power efficiency are crucial
• Portable power tools or devices needing high power-to-weight ratios
• Industrial linear actuators and drives

BenefitsContent extracted from patent full text and abstract with AI.

• Lower energy losses due to absence of iron in windings (reduced eddy current and hysteresis losses)
• Higher power efficiency and performance compared to traditional motors
• Reduced overall motor weight and dimensions, enabling use in weight-sensitive applications
• Flexible topology: suitable for both rotary and linear motor configurations
• Simultaneous use of all magnetic poles increases force/torque output and reduces torque ripple
• Simplified construction and easier manufacturing due to fewer complex laminated iron components
• Potential for sensorless operation due to integrated position-sensing capabilities
• Customizable for various phase and topology requirements

Technical Classifications (CPCs)

Inventors & Applicants

Patent Abstract

The invention relates to an electric motor (1), at least comprising a primary part (2a, 2b) having an iron-free winding device (3) that comprises at least two phases (6), wherein one phase (6) comprises at least two phase windings (4) and at least one electrical connecting element (5), a secondary part (7a, 7b) having an even number of magnetic poles (8), which are arranged alternately on the secondary part (7a, 7b), wherein the winding device (3) is arranged in an air gap (9) between the primary part (2a, 2b) and the secondary part (7a, 7b) relative to an axis (10a, 10b), in such a manner that each phase winding (4) of a phase (6) is arranged opposite a respective magnetic pole (8) and all magnetic poles (8) can be used simultaneously for force formation.