Methods and systems for controlling an electric motor

    公开(公告)号:US09923505B2

    公开(公告)日:2018-03-20

    申请号:US14090365

    申请日:2013-11-26

    CPC classification number: H02P27/04 H02M2001/385 H02P21/50

    Abstract: A system and method of controlling an electric motor using a motor drive controller are provided. The motor drive controller includes a rectifier configured to convert an AC input voltage to a DC voltage, a DC bus electrically coupled to the rectifier, an inverter electrically coupled to the DC bus and configured to generate an AC voltage to drive the electric motor, and a control unit. The control unit includes a sign calculation module configured to determine a polarity of each phase of a reference current command and a compensation module configured to generate a voltage compensation command signal using one of the determined polarities of the reference current command and a measured current, and one of a measurement of DC bus voltage and a constant DC bus voltage value, the voltage compensation signal compensating the drive controller to neutralize a deadtime effect.

    BEARING LOCK, BEARING ASSEMBLY AND ASSOCIATED METHOD

    公开(公告)号:US20180010643A1

    公开(公告)日:2018-01-11

    申请号:US15202612

    申请日:2016-07-06

    Abstract: A lock for use with an assembly is provided. The assembly includes an inner race having a bore with a generally tapered periphery. The bearing assembly supports a shaft. The bearing lock includes a sleeve having a generally cylindrical internal periphery adapted for cooperation with the shaft and a generally tapered external periphery that cooperates with the bore. The sleeve conforms from a first condition whereby the internal periphery defines a first diameter to a second condition whereby the internal periphery defines a second diameter different than the first. The bearing lock also includes a collar that cooperates with the sleeve to urge the sleeve from the first condition to the second condition. The collar conforms from a first condition whereby the generally cylindrical internal periphery defines a first diameter to a second condition whereby the internal periphery defines a second diameter substantially different than the first.

    BEARING RETAINER, BEARING AND ASSOCIATED METHOD

    公开(公告)号:US20180010640A1

    公开(公告)日:2018-01-11

    申请号:US15202604

    申请日:2016-07-06

    CPC classification number: F16C33/6614 F16C19/16 F16C33/3862 F16C33/3875

    Abstract: A bearing retainer for use in a bearing is provided. The bearing includes an inner ring, rolling elements and an outer ring. The bearing retainer has a body. The body defines an inner periphery and an outer periphery of the body. The body further defines a plurality of openings extending from the inner periphery to the outer periphery of the body. The plurality of openings are adapted to retain the rolling elements in a spaced apart relationship. The body further defines opposed faces extending from the inner periphery to the outer periphery of the body. The body further defines a plurality of face pockets formed in at least one of the faces of the body. The face pockets are adapted to storing lubrication. The body further includes a pathway from at least one face pocket of the body to the inner periphery of the body.

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