Trw Limited

Trw Automotive U.S. LLC

Michael A Jones

George M Harpole

Michael B Petach

Henry C Sangret

A non-invasive apparatus and method for measuring the speed of a rotating device that includes a sensor that measures a dynamic characteristic of the rotating device. A sample of the signal is transformed from the time domain into a frequency spectrum. The frequency spectrum is then analyzed to determine the motor speed. The resulting motor speed can be combined with other motor data by an order analysis to identify malfunctioning or improperly installed components.

Method and apparatus for determining the rotational rate of a rotating device

An improved electric motor (,) includes a plurality of resiliently deflectable members (,) which are disposed between a base (,) and a stator (,) to reduce transmission of vibration between the base and the stator. The resiliently deflectable members (,) may be tubular spring pins which are disposed between the stator (,) and the base (,). Each of the tubular spring pins (,) may have a cylindrical side wall (,) which defines a slot (,). During operation of the electric motor (,), vibration induced in the stator (,) causes the side walls (,) of the spring pins (,) to resiliently deflect to attenuate the vibration. The stator (,) may be mounted on a tubular section (,) of the base. The spring pins (,) may be disposed between the stator (,) and the tubular section (,) of the base. The tubular spring pins (,) may be formed by rolled up sheet members (,).

Electric motor with vibration attenuation

An apparatus (30) for use in pumping hydraulic fluid includes a pump unit (32) which is driven by an electric motor (34). The electric motor (34) is mounted on a tubular stem (108) which extends axially outward from a manifold plate (44). A stator (100) of the electric motor (34) is fixedly connected with the tubular stem (108). A rotor (112) of the electric motor (34) encloses the stator (100). A hydraulic muffler (50) attenuates noise produced by the gear pump unit (32). The hydraulic muffler (50) includes a channel (58) which extends into the manifold plate (44) from a major side surface (63) of the manifold plate. To increase the ability of the hydraulic muffler (50) to attenuate noise, one or two compliant elements (152 or 166 and 168) are connected with the channel (58).

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Torrance, CA, United States of America

Michael A Jones