公开(公告)号：US11489469B2

公开(公告)日：2022-11-01

申请号：US16479456

申请日：2017-12-12

Applicant: JING-JIN ELECTRIC TECHNOLOGIES CO., LTD.

Inventor： Bin Hao ,  Xiao Ye

IPC: H02P21/18 ,  H02P21/22

Abstract: The present disclosure discloses a method for measuring an initial position angle of a rotor of an electric machine, which solves the technical problem in the prior art that the requirement on the measurement conditions of the initial position angle of the rotor of the electric machine is high and the actual operation is not easy. The method comprises: Step 1, supplying an electric current i to an electric machine to be measured to cause the electric machine to run; Step 2, when the electric machine is running, reducing the electric current i to be zero; Step 3, measuring voltages of a d-axis and a q-axis of a stator of the electric machine at the moment, respectively as ud and uq; and Step 4, according to a trigonometric function relation between ud and uq, calculating to obtain an initial position angle deviation θerr of the rotor of the electric machine.

公开(公告)号：US10330159B2

公开(公告)日：2019-06-25

申请号：US15575975

申请日：2017-01-20

Applicant: Jing-Jin Electric Technologies Co., Ltd.

Inventor： Ping Yu ,  Ting Wang ,  Xiao Ye

IPC: F16D27/118 ,  F16D27/14 ,  F16D11/14 ,  F16D43/202 ,  F16D11/00 ,  F16D27/00

Abstract: This Application pertains to an electromagnetic dog clutch, including a movable gear sleeve and a fixed toothed sleeve that are engaged to transmit power. The movable gear sleeve is provided with contrate transmission teeth or tooth spaces, and the fixed toothed sleeve is correspondingly provided with contrate tooth spaces or transmission teeth. The transmission teeth have a uniform thickness in a direction of tooth length, tooth spaces that engage with the transmission teeth have a sector-shape in a direction of tooth space length, and the width of two sides of the tooth spaces gradually increases outwardly along the radial direction of the fixed toothed sleeve and gradually decreases inwardly along the radial direction of the fixed toothed sleeve. By employing the engagement of transmission teeth of uniform thickness and sector-shaped tooth spaces, the transmission teeth can more easily engage with the tooth spaces, and more easily realize surface contact.