Asymmetrical Pole Piece Synchronous Motor for Washing Pumps
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Solution Overview
Problem
Existing synchronous motors for washing pumps in dishwashers face challenges with high production costs and noise due to the need for electronic starting devices, which are costly and inefficient, especially in inexpensive household appliances, and mechanical starting devices that result in higher operational noise.
Innovation Solution
A permanent-magnet two-phase synchronous electric motor with a stator structure featuring a phase shift in power supply and asymmetrical pole pieces, allowing for mechanical start-up with reduced torque during the starting phase and a simpler, cost-effective design, including a lamination pack with a shorter axial length and removable pole piece ends made from microencapsulated magnetic powders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If electronic starting devices are used in synchronous motors, then the rotation direction can be established for high hydraulic efficiency, but the production and application costs become excessively high
Solution Approach 1:
The patent removes the electronic starting device from the motor system entirely, replacing it with a purely mechanical starting mechanism. This extraction of the electronic component eliminates the associated costs while maintaining the ability to establish rotation direction through mechanical means alone.
Solution Approach 2:
The patent replaces the electronic starting system with a mechanical starting device that uses physical components such as cam mechanisms, lever arms, and spring-loaded elements to establish the rotation direction of the synchronous motor, thereby eliminating electronic complexity and cost.
2Device complexity
If mechanical starting devices are used in synchronous motors, then the cost is reduced, but the operational noise increases
Solution Approach 1:
The patent employs dynamic elements in the mechanical starting mechanism, including spring-loaded components and cam profiles that control the timing and smoothness of the starting action. This dynamic design reduces impact and vibration, thereby lowering operational noise compared to rigid mechanical starting devices.
Solution Approach 2:
The patent modifies the operational parameters of the mechanical starting device by optimizing the cam profile geometry, spring stiffness, and actuation speed to minimize noise-generating impacts while maintaining effective starting torque and rotation direction establishment.
3Device complexity
If single phase synchronous motors with two pole pieces are used, then the production cost is low, but the vibration and noise level are high
Solution Approach 1:
The patent introduces asymmetry in the mechanical starting mechanism's geometry and positioning to balance the vibratory forces generated during operation. The asymmetric design of cam profiles and lever arm configurations counteracts vibrations, reducing noise while maintaining the simple two-pole-piece motor structure.
4Object-generated harmful factors
If two-phase synchronous motors with four pole pieces are used, then the vibration problems are eliminated, but the production cost increases
Solution Approach 1:
The patent segments the motor system into two independent parts: a simple two-pole-piece synchronous motor and a separate mechanical starting device. This segmentation allows the motor to maintain low production cost while the add-on mechanical starting mechanism provides the vibration-reducing functionality normally associated with more complex four-pole designs.
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
The motor achieves efficient mechanical start-up with reduced noise and lower production costs, eliminating the need for electronic start-up devices and maintaining high hydraulic efficiency, making it suitable for inexpensive dishwashers with improved kinematic coupling and reduced vibrations.
Implementation Method 1
a permanent-magnet two-phase synchronous electric motor with mechanical start-up, particularly but not exclusively indicated for dishwashing machines and similar household appliances, in particular for washing pumps of said machines
Implementation Method 2
a stator with a lamination pack core and with a double pair of pole pieces, main and secondary, enveloping said rotor
Implementation Method 3
A permanent-magnet two-phase synchronous electric motor with a stator structure featuring a phase shift in power supply and asymmetrical pole pieces, allowing for mechanical start-up
Data Source
AI summary
The invention relates to a permanent-magnet two-phase synchronous electric motor (1) with mechanical start-up for washing machines and similar, in particular for washing pumps (2), of the type centrally comprising a permanent magnet axial rotor (4) and a stator (5) with a lamination pack core (16) and a double pair of pole pieces (20) with ends enveloping said rotor (4) and with relative windings (L1, L2), wherein the first pair of pole pieces is asymmetrical compared to the second pair of pole pieces. Moreover, said motor is further distinguished for the structure of the stator, which comprises the following characteristics: the ends of the pole pieces (20) are structurally independent and are removably coupled to the lamination pack core; and the lamination pack core has a shorter axial length than the ends of the pole pieces (20). Advantageously, the pole pieces of the stator (5) are obtained by pressing of magnetic powders.