Staggered Motor Coil Windings for Lower Mutual Inductance Loss
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Solution Overview
Problem
Existing motor coil structures experience large energy losses and poor performance due to mutual inductance effects between phase coils, which impede current ripple control and increase impedance.
Innovation Solution
The motor coil is designed with x sets of windings, where each set includes m-phase windings with n coil branches, connected in a staggered configuration to reduce mutual inductance by forming electrical angles of 360 degrees and P * (360 * k + 360/m) degrees, enhancing inductance and reducing energy losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a motor coil structure with phase coils is used to drive the motor, then the motor can be driven, but mutual inductance effect is generated between phase coils, impeding control of current ripples and increasing energy losses
Solution Approach 1:
The motor coil is divided into multiple independent winding sets (first winding set, second winding set, etc.), each with its own phase windings and coil branches. This segmentation reduces the mutual inductance effect between phase coils by spatially separating the windings, thereby improving current ripple control and reducing energy losses.
Solution Approach 2:
The patent introduces a new spatial dimension by arranging coil branches at specific electrical angles (360 degrees and P*(360*k + 360/m) degrees). This dimensional arrangement in the electrical angle space reduces the coupling between phase coils, effectively mitigating the mutual inductance effect while maintaining motor drive capability.
2Reliability
If phase coils are connected with driving circuit to enable motor operation, then motor driving is achieved, but impedance control is affected and working performance is reduced
Solution Approach 1:
Different winding sets are configured with specific local characteristics, including designated phase windings and coil branches arranged at particular electrical angles. This local quality differentiation allows each winding set to contribute differently to the overall motor performance, improving working performance while managing structural complexity through functional specialization.
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 effectively reduces energy losses and improves control of current ripples, addressing the impedance issues in motor coil performance.
Implementation Method 1
a motor coil in a motor is generally formed by a plurality of phase coils... when a current passes through the motor coil, a mutual inductance effect is generated between the phase coils
Implementation Method 2
when a current passes through the motor coil, a mutual inductance effect is generated between the phase coils, impeding control of the current ripples
Data Source
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AI summary
The disclosure relates to the field of electronic technologies, and provides a motor and an energy conversion device therefor. The motor includes a motor coil. The motor coil includes x sets of windings. A number of phases of the x sets of windings is mx. In each of the x sets of windings, each phase winding includes nx coil branches. A first end of each of the nx coil branches of each phase winding is connected with a first end of a coil branch separated from the coil branch by an electrical angle of 360 degrees, to form mx phase endpoints. A second end of each of the nx coil branches of each phase winding is further connected with a second end of a coil branch separated from the coil branch by an electrical angle of P ∗ (360 ∗ k1 + 360/mx) degrees to form nx neutral points, nx ≥ mx ≥ 2, nx ≥ 3, p = ± 1, 1 ≤ k1 ≤ (nx-1), and mx nx, and k1 are all integers.