2results about How to "No torque" patented technology

The invention relates to a power conversion device for an in-vehicle electrical system and the in-vehicle electrical system including the same. The system comprises at least one motor and a motor inverter, the device further comprises a controller and at least one switch assembly, and the controller is configured to enable the power conversion device to be switched among different working modes by controlling the on-off state of each switch element in the at least one switch assembly. The working modes of the power conversion device comprise an electric drive mode and a power conversion mode, and the controller is further configured to enable the inter-phase volt-second product between phase outputs of the at least one motor inverter to be zero by selecting a proper pulse modulation strategy in the power conversion mode. In this way, it is ensured that no DC voltage component and / or low-frequency AC voltage component is generated on each phase winding of the at least one electric machine without disconnecting the at least one electric machine and the at least one electric machine inverter.

This invention relates to the field of grinding equipment and provides a surface grinding device and method for curved LCD screens based on a laser pointer. The device includes a fixedly mounted lifting frame and a platform. A transport guide rail is located at the bottom of the lifting frame, and a traction handle is located at the top of the platform. A grinding mechanism is located at the bottom of the platform. Each of the four corners of the platform has a branch tube. A display screen workpiece is placed at the top of the frame and the branch tubes, and edge protection components are provided at the ends of the branch tubes. In use, the display screen workpiece is placed on the frame and the branch tubes. A stepper motor drives a steering gear set via its output shaft. The steering gear set drives a drive bevel gear through a telescopic sleeve. The drive bevel gear simultaneously drives both the forward and reverse bevel gears. During the grinding process, the grinding ring and grinding disc apply opposite frictional forces to the display screen workpiece. These two frictional forces cancel each other out, thus achieving precise grinding.