Device for Simulating the Symmetrical and Asymmetrical Impedance of an Asynchronous Machine

Simple SummaryContent extracted from patent full text and abstract with AI.

This patent describes a device that simulates both the symmetrical and asymmetrical impedance characteristics of a three-phase asynchronous (induction) machine over a wide frequency range relevant for electromagnetic compatibility (EMC) testing. The device uses a modular circuit design with inductive and capacitive components to closely mimic the electrical response of real electric motors, allowing for accurate testing of EMC filters without needing to use the bulky and heavy actual machines.

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

• Laboratory testing of EMC (EMV) filters for variable-speed drive systems without requiring real industrial motors.
• Product development and calibration for manufacturers of EMC filters, enabling faster and more cost-effective processes.
• Training and education purposes for understanding and demonstrating the impedance behavior of asynchronous machines.
• Simulation, research, and development activities where a precise motor model is needed but using the actual equipment is impractical or expensive.
• Quality control and certification testing in standards-compliant settings to verify EMC filter performance.

BenefitsContent extracted from patent full text and abstract with AI.

• Significantly reduces the cost and logistical burden by eliminating the need to transport and handle full-size, heavy asynchronous machines for testing.
• The device is much smaller and lighter than a real motor (e.g., less than 3 kg versus ~300 kg), making it far more convenient to use.
• Facilitates accurate and repeatable EMC filter measurements by providing a consistent and tunable impedance model.
• Allows rapid adaptation to different motor power classes simply by adjusting component values.
• Enables precise impedance simulation across a broad frequency range (10 kHz to 30 MHz), capturing both symmetrical and asymmetrical behavior for improved testing accuracy.
• Simplifies the hardware for complex testing, requiring only a modest number of inexpensive components.

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Inventors & Applicants

Patent Abstract

The invention relates to a device for the simultaneous simulation of the symmetrical and asymmetrical impedance of an asynchronous machine. The device has three sub-circuits for simulating the three phases of the asynchronous machine. Each sub-circuit preferably comprises a series circuit between the input and output terminals, said circuit consisting of a magnetising inductance, a leakage inductance and an impedance, which are connected in parallel to earth by a respective capacitor and an impedance. The magnetising inductances of the sub-circuits are magnetically coupled, or the effect of a magnetic coupling is simulated. The advantage of the device is that it can be used in place of the asynchronous machine during the initial measurement of EMV filters.