34results about How to "Reduced torque ripple" patented technology

This disclosure relates in general to a new and improved method for producing electric energy or mechanical power, and in particular to an improved system and method for producing rotary motion from a electro-magnetic motor or generating electrical power from a rotary motion input by concentrating magnetic forces due to electromagnetism or geometric configurations.

The invention provides a rotor and motor and / or electric vehicle driving apparatus including the same. The motor includes a plurality of tooth bodies extending from a rotor core. A pole shoe extends from an end of at least one tooth body at opposite sides where both sides of the pole shoe have a curved outer part opposite to each other and asymmetric to each other in that a radius of curvature of the curved outer part of the one side of the pole shoe that is in a rotational direction of the rotor has a smaller radius than a radius of curvature of the other side of the pole shoe that is not in the rotational direction of the rotor.

The invention provides a synchronous reluctance motor rotor structure, a motor and a manufacturing method of the rotor structure. The synchronous reluctance motor rotor structure comprises a rotor core which is provided with multiple slit slots, two ends of each of the slit slots are provided with two filling grooves to form a magnetic barrier layer, a first end of each of the filling grooves is adjacent to a slit slot, a second end of each of the filling grooves extends in the radial direction of the rotor core, and the outer peripheral surface of the rotor core is provided with a notch communicating with an end of the second end each of the filling grooves. By setting notches and bevels at the ends of the filling grooves, the reluctance torque of the motor can be increased, the torque ripples generated by a rotor and a stator tooth space can be weakened by each other, the purpose of reducing the torque ripple of the motor is achieved, the vibration noise of the motor is reduced, theefficiency of the motor with the rotor structure is improved, and the starting ability of the motor is improved.

Disclosed are various embodiments for an improved generator / motor and a method of generating current, the method comprising providing a circular rotation path, generating a concentrated magnetic field around a portion of the circular rotation path; rotating a coil along the circular path and through the concentrated magnetic field; generating current within the coil as a result of the rotating, and extracting the current from the coil.

A vibration motor includes: a lower case provided with a lower board; an upper case coupled with the lower case; a four-pole magnet provided on the lower case; a shaft supported between the lower case and the upper case; a rotor rotatably supported by the shaft with an eccentricity, in which a pair of coils is provided in the rotor at an angle ranging form 135° to 142° between centerlines thereof; a commutator formed on a bottom of the rotor with six segments; and a pair of brushes having lower parts contacted with the lower board and upper parts contacted with the segments of the commutator at an angle of 90° therebetween.

A system and method for reducing drive motor speed ripple of an electric vehicle are provided. The system includes an inverter that converts DC power supplied from a battery to AC power and supplies the AC power to the drive motor by inverter switching. A resolver is configured to detect a speed of the drive motor and a position of a rotor, a signal generator includes a microcontroller that is configured to generate a square wave signal. An integrator is configured to convert the square wave to a sine wave, and apply a sine-wave excitation input signal to the resolver. Furthermore, a motor controller is configured to adjust the frequency of the excitation input signal to prevent the inverter switching frequency of the inverter and the peaks of an output voltage signal sampled for speed calculation from overlapping.

The invention discloses an induction motor control method, device and induction motor. The motor model calculation module is used to replace the PI regulator of the current loop in the vector control and the Park inverse conversion link, and the motor model calculation module is used to replace the traditional one in predictive control. Rolling optimization module and objective function calculation module. There is neither current closed-loop PI control nor complex rolling optimization in the whole control, which can reduce the debugging time, avoid the problems of large torque ripple and high sampling frequency, and make the control more direct and effective.

The present application relates to methods and systems for torque control. Methods and systems are provided for reducing torque ripple during hybrid engine shutdown and restart. The valve actuation mechanism may be actuated during engine restart and shutdown events to operate the engine with a selected valve lift profile that is different from the valve lift profile applied during cylinder combustion . The selected valve lift profile reduces cylinder pressure during engine shutdown and restart.

The present invention relates to methods and systems for engine control. Methods and systems are provided for enhancing the benefits of variable compression ratio engines in hybrid vehicle systems. During engine pull-up and pull-down, the vehicle controller may maintain the engine at a lower compression ratio, especially when passing through low speed regions where compression bounce can occur. During engine operation, in response to changes in driver demand, the controller may choose to switch the compression ratio or maintain the current compression ratio while using motor torque to smooth undertorque, the selection being based on fuel economy.

A screw compressor in which noise and vibration caused by a variation in compression torque are effectively reduced. The screw compressor (1) has a first meshing body (2) and second meshing bodies (5, 6). The first meshing body (2) has helical grooves (11) around a first rotating shaft (4). The second meshing bodies (5, 6) have projections (12) or ridges formed around second rotating shafts (8, 9). At least one projection (12) or ridge of each second rotating shaft (8, 9) is placed irregularly in the circumferential direction with respect to the other projections (12) or ridges. The helical grooves (11) are arranged in the circumferential direction in the first rotating shaft (4) so as to be able to mesh with the projections (12) or ridges.

The invention provides a switched reluctance motor including a U-shaped rotor magnetic pole structure. The switched reluctance motor comprises a stator and a rotor, wherein the stator and the rotor are coaxially arranged. The stator comprises a number of stator magnetic poles uniformly distributed in the circumferential direction. Each stator magnetic pole comprises a stator magnetic pole root anda number of stator magnetic pole teeth extending radially from the stator magnetic pole root toward the rotor. Each stator magnetic pole is wound with a coil. The rotor comprises a number of rotor magnetic poles uniformly distributed in the circumferential direction. Each rotor magnetic pole comprises a rotor magnetic pole root and a number of rotor magnetic pole teeth extending in the circumferential direction from the same side of the rotor magnetic pole root, wherein the rotor magnetic pole teeth and the rotor magnetic pole root share the same curvature. A number of stator magnetic pole teeth and a number of rotor magnetic pole teeth are axially aligned with each other. According to the switched reluctance motor provided by the invention, radial vibration and torque ripple of the motor can be significantly reduced; noise generated by radial vibration can be reduced; and the motor efficiency is improved.

The invention provides a rotor punching structure of a permanent magnet servo motor, comprising a rotor punching body, a permanent magnet groove is arranged on the circumferential surface of the rotor punching body, and a permanent magnet is embedded in the permanent magnet groove; the rotor above the permanent magnet groove The outer diameter of the punching body is not concentric with the inner circle of the stator; the rotor punching body above the permanent magnet slot is provided with magnetic isolation holes arranged in parallel, and the rotor punching body below the permanent magnet slot is provided with an axial cooling channel. The permanent magnet slots are arranged in layers in the radial direction, a magnetic isolation slot is provided between the permanent magnet slots of adjacent layers, and a magnetic isolation bridge is provided between the magnetic isolation slots and the permanent magnet slots. The invention improves the rotor punching structure, controls the direction of the magnetic field, reduces the non-linear influence of the motor parameters caused by the coupling of the alternating and direct axis magnetic circuits, makes full use of the rotor punching space to place as many permanent magnets, and improves the demagnetization resistance of the permanent magnet servo motor capacity and overload capacity, effectively improving the performance of the permanent magnet servo motor.