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    Braking system for electric motors
    1.
    发明授权
    Braking system for electric motors 失效
    电动马达制动系统

    公开(公告)号：US3574325A

    公开(公告)日：1971-04-13

    申请号：US3574325D

    申请日：1969-02-19

    Applicant: GEN MOTORS CORP

    Inventor： AGARWAL PAUL D

    IPC: H02K7/102 ,  H02P3/26 ,  F16D65/36

    CPC classification number: H02P3/26 ,  H02K7/102

    Abstract: A braking system for electric motors and particularly a braking system for braking an induction motor which is utilized to propel a vehicle. The braking system utilizes combined hydraulic and electric braking where the interior of the electric motor is flooded with a fluid cooling medium such as oil at the same time that the motor is connected in an electric braking mode of operation. The cooling oil which is supplied to the interior of the motor provides a viscous drag on the rotor of the motor since it fills the air gap of the motor and, therefore, impedes rotation of the motor rotor. The electric braking, which takes place at the same time as the hydraulic braking, can be performed by a braking operation where the stator winding is connected with a source of direct current or can be performed by a plugging operation where two of the input leads to a polyphase motor have their connections to a source of alternating current reversed. During the electric braking heat is generated in the rotor of the motor and the cooling oil performs the function of a hydraulic retarder as well as cooling the rotor during the time that the motor is operating in a braking mode. The invention is particularly useful in braking electrically powered vehicles for extended periods of time where the vehicle is propelled by an electric motor.

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