linear motor

Abstract

A linear motor (LEM) comprising: a stator mounted in a housing, the housing and stator defining a working cylinder; a central core within the working cylinder defining a cylindrical stator bore between the central core and the working cylinder; a hollow translating body , can move axially in the working cylinder, extend into the stator bore and form an external magnetic circuit air gap between the translation body and the stator; at least one fluid bearing provides a bearing gap between the central core and the translation body, where the center The core is fixed axially with respect to the stator, wherein the at least one fluid bearing provides coaxial positioning of the translating body and the central core.

Description

technical field [0001] The invention relates to a linear motor. Background technique [0002] Such linear motors can be used in a variety of applications including, but not limited to: use as a free piston engine linear generator, where combustion pressure acts on a translating body to produce useful electrical output; as a gas expander, where high pressure gas acts on On a translator to produce a useful electrical output; as a gas compressor, where the electrical input causes movement of the translator to pressurize the gas; in hydraulic systems, where movement of the translator causes displacement of hydraulic fluid within the working chamber , or displacement of hydraulic fluid within a working chamber to cause movement of a translating body; and as an actuator, where an electrical input causes movement of a translating body to produce a desired actuation effect. [0003] Such actuators can be used in displacement and vibration testing systems, manufacturing processes, a...

AI Technical Summary

Problems solved by technology

[0008] Second, servohydraulic systems require expensive and specialized infrastructure within the test facility, which can be extremely bulky, and must still be located relatively close to the hydraulic actuators to limit the inertia of the oil moving within the system

Additionally, the infrastructure requires professional expertise to operate and maintain

[0009] Third, servohydraulic systems are large consumers of electricity, making their operation expensive and contributing to the carbon footprint of vehicle development and manufacturing

[0010] Fourth, servohydraulic systems can be extremely noisy, making it difficult to distinguish between noise due to the test object's response and the associated noise of the test actuator system itself

This extra inertia reduces the peak frequency the actuator can achieve for a given displacement

[0016] Second, the use of compliant members such as airbags or mechanical springs introduces the potential for unwanted resonances in the test actuator system, compromising the integrity of the input function applied to the test object

[0017] Third, due to the need to couple discrete spring and motor assemblies within each actuator test frame, the arrangement taught by US7401520 requires unnecessary structural complexity, resulting in increased cost and size of the overall apparatus

This friction will affect the net force applied to the test object and may also cause wear and shortened life of the actuator

[0022] Third, the arrangement taught by US8844345 requires unnecessary structural complexity due to the need to couple motors, pneumatic cylinders, movable members and mounts for test objects within each actuator test frame, resulting in overall equipment cost and size increase

The linear motors typically used in free piston engines are rarely able to achieve the desired level of motion control due to the high piston mass of these machines relative to the force that can be exerted by the motor

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