Energy-efficient system of an asynchronous motor with optimized stator winding and fixed external compensation

Abstract

Energy-efficient system of a three-phase asynchronous motor, comprising - a three-phase asynchronous motor with a specially designed, optimized stator winding, and - an external compensation device with a fixed electrical capacity.

Description

Technical area:

[0001] The invention relates to AC electrical machines, in particular to systems for increasing the energy efficiency of three-phase induction motors used in variable and full load applications where a high power factor, lower energy consumption and improved starting characteristics are required. Aim of the invention:

[0002] The aim of the invention is to develop an integrated system comprising: • a specially developed (optimized) stator winding of a standardized three-phase asynchronous motor; • an external compensation device with a fixed electrical capacity;

[0003] This combination enables: • a stable high power factor (cosφ = 0.98-0.99) at any load; • a significant reduction in active energy consumption; • reduced power consumption and thermal losses in the supply network; • simplified engine start with noticeably reduced starting power (approximately halved); • Scalability of the technology for motors of different power classes without changing the compensation principle. Brief description of the invention:

[0004] The proposed system consists of two interconnected components that work synergistically: 1. Asynchronous motor with optimized stator winding The winding is designed to: ◯ creates an optimal magnetic field, ◯ Reactive power losses reduced, ◯ enables a harmonised coupling with the external compensation system, ◯ improves the starting characteristics of the motor. 2. Compensation device This consists of passive components (preferably capacitors) with precisely defined values ​​that are connected to the motor terminals. The device contains no electronics, chokes, switches, or active control elements. The capacitance is fixed and does not adjust during operation. Test results: • The power factor (cosφ) remains constant in the range of 0.98 to 0.99, regardless of the load. • Compared to a standard motor without compensation, energy consumption is reduced by: ◯ up to 66% idle, ◯ up to 41% at partial load, ◯ up to 28% at full load. • The required starting power is about twice as low as that of a conventional asynchronous motor. Special features: • Integration of a specially developed stator winding with external fixed compensation; • constant capacity that does not require adjustment during operation; • no active components or complex control units; • significantly improved energy and starting properties; • System is scalable to engines of various power classes. A notice:

[0005] The technical details regarding the winding design and the exact compensation parameters are intentionally not disclosed in this application. They can be submitted in an extended application or specified in a separate patent application.

Claims

[1] Energy-efficient system of a three-phase asynchronous motor, comprising - a three-phase asynchronous motor with a specially designed, optimized stator winding, and - an external compensation device with a fixed electrical capacity. [2] System according to claim 1, characterized by that the stator winding is designed to generate an optimal magnetic field, reduce reactive power losses and improve the starting characteristics of the motor. [3] System according to claim 1, characterized by that the external compensation device consists exclusively of one or more capacitors with fixed capacitance values ​​and does not contain any active electronic components, chokes, switches or control units. [4] System according to one of claims 1 to 3, characterized by that the power factor (cos φ) of the system is in the range of 0.98 to 0.99 over the entire load range. [5] System according to one of claims 1 to 4, characterized by that, compared to a standard three-phase asynchronous motor without compensation, the active energy consumption is reduced and the required starting power is at least 40% lower. [6] System according to one of the preceding claims, characterized by that the system draws active power almost exclusively from the supply network during operation over the entire load range and the power factor (cos φ) remains stable at approximately 0.98 to 0.

99. [7] System according to one of the preceding claims, characterized by that the apparent power consumed by the system is significantly lower in all operating conditions than that of a conventional asynchronous motor of the same rated power without compensation, which means that supply network components such as transformers, supply lines and switchgear are subjected to less load. [8] System according to one of the preceding claims, characterized bythat the active power consumption required to provide a certain mechanical power is significantly lower than that of a conventional asynchronous motor of the same rated power without compensation, thus achieving higher energy efficiency during operation. [9] System according to one of the preceding claims, characterized by that it is applicable and scalable for three-phase asynchronous motors.