963results about How to "Increase output torque" patented technology

A permanent magnet rotor for a brushless electric motor, comprising at least two main magnetic poles, disposed on a periphery of a rotor. Each opening angle A covers N/2 times the opening angle of each of the stator sections, with N being an odd number greater or equal to 3. A is required to be the nearest angle that is smaller than 360/P degrees, with P being the number of poles. Each of the main magnetic poles has a periphery with a central section R1 and two end sections R2 R1has an opening angle A1. The opening angle A1 covers N/2 times the opening angle of each of the stator sections, with N being an odd number greater or equal to 3. A1 is required to be smaller than the opening angle A of each of the main magnetic poles of the rotor. Each of the main magnetic poles contains a dual-plate permanent magnet.

A hydrogen-powered hybrid powertrain system includes a hydrogen-fuelled internal combustion engine operating at a lean air/fuel mixture, and a supercharger for boosting a primary drive torque produced by the engine primarily over a high operating speed range. An electric motor/generator generates a secondary drive torque for the vehicle, such that the secondary drive torque complements the boosted primary drive torque over at least a low operating speed range of the powertrain. A disconnect clutch disposed between the engine and the motor/generator engages and disengages the engine from the motor/generator, and serves to transfer the boosted primary driver torque through the motor/generator and to a power transmission system. The input at the power transmission is thus a combination of the boosted primary drive torque and the secondary drive torque having an enhanced torque characteristic over at least the low operating speed range.

The invention discloses a shaftless driven type integrated motor propeller which is arranged on the tail part of a boat body of a water vehicle or underwater vehicle and comprises a front stator, a rotor propeller and a rear stator which are serially arranged on a solid non-rotating shaft, wherein the periphery of the propeller is connected with the circumferential rim of the annular propeller, a rotor permanent magnet is embedded in the circumferential rim of the propeller, a stator winding is arranged in the inner cavity of a guide pipe, the rotor permanent magnet and the stator winding are sealed by adopting water, and a gap is arranged between the rotor permanent magnet and the stator winding to form an annular motor. The rotor permanent magnet and the stator winding as well as the guide pipe are organically combined to form a modular unit, thus the shaftless driven type integrated motor propeller can be easily installed on a water platform or underwater platform, is suitable for large-power main propelling of a water boat or underwater submergible device, and has the advantages of reasonable structure, high propelling efficiency, low hydrodynamic force radiation noise, excellent cavitation property, safety and reliability.

A method for reducing EMI emissions in the control of an electric motor supplied by a switching inverter fed by a DC bus comprising controlling a phase advance of a conduction angle period during which a phase of the motor is fed power by the inverter to control the conduction angle to control the speed of the motor, thereby to reduce the number of switching operations of the inverter and thereby reduce EMI.

The invention discloses a novel rotating travelling-wave ultrasonic motor. The ultrasonic motor comprises the following main parts: two stators, a rotor, a pedestal, a friction pad, a check ring, a bearing and the like. The two stators which are in a same shape are symmetrically arranged and compact on two end faces of the rotor. Working faces of the two stators can be parallelly contacted with a surface of the rotor so that a contact surface of the stators and the rotor bears stress evenly. In a current rotating travelling-wave ultrasonic motor based on a single stator structure, radial contact between the stator and the rotor is nonuniform, a contact scope is small, and radial sliding friction losses and other defect are existed in the stator and the rotor. By using the ultrasonic motor of the invention, the above defects can be overcome. A maximum output torque and an efficiency of the rotating travelling-wave ultrasonic motor can be increased and a service life of the rotating travelling-wave ultrasonic motor can be prolonged.

An excavation apparatus, for mounting on track type excavator, having a mast, a sled slidably mounted on the mast, a sled driving system supported by the mast for downcrowding and upcrowding the sled along the mast, and an extendable kelly section system that prevents slippage of the sled relative to the mast. The extendable kelly section system has a non-rotating outer kelly section attached to the sled, and a non-rotating inner kelly section that is extendable from and retractable into the outer kelly section. A bushing assembly maintains the outer kelly section slidable on the mast. The inner kelly section is automatically powered into and out of the outer kelly section a distance proportional to the distance that the sled is downcrowded or upcrowded along the mast while preventing slippage of the inner kelly section relative to the outer kelly section. A rotary motor, attached to the sled, rotates a telescopic shaft housed within the non-rotating kelly sections, which provides rotary power to an excavation tool. Alternatively, a transmission is secured to the lower end of the inner kelly section and the lower end of the telescopic shaft is connected to the input shaft of the transmission to increase the torque to the excavation tool. The transmission, which does not have an external source of transmission fluid, can be a one speed or two speed and can travel downhole. A boom connector and a mechanism for downcrowding and upcrowding the mast on the boom connector provides additional drilling depth capability. A side-to-side mechanism tilts the mast relative to the plane of the boom.

The invention provides a weak magnetic speed regulating method for an induction motor, and belongs to the technical field of alternating current motors and control thereof. The method comprises the following steps of: determining actual given values of exciting current and torque current by using a current control algorithm based on current optimal working trajectory; acquiring space vector pulse width modulation (SVPWM) through a current loop, and obtaining calculation action time of two adjacent non-zero voltage vectors; determining actual action time of the two non-zero voltage vectors through a modulation algorithm so as to acquire a running voltage of the motor; and at the same time, determining a field current calculation given value of the next time through the calculation action time of the two adjacent non-zero voltage vectors. By the method, an operating range of speed constant power of the induction motor is enlarged, a utilization ratio of the voltage and the current of an inverter is increased, and the maximum output torque of the induction motor is improved.

Methods and systems are provided for adjusting an engine output delivered in response to an operator pedal actuation based at least on a grade of vehicle travel. During uphill travel, in the presence of headwinds, and/or in the presence of a vehicle payload, the output may be increased while during downhill travel or in the presence of tailwinds, the output may be decreased. In this way, driver fatigue during travel over varying elevations, varying ambient conditions, and varying loads can be reduced.

The invention discloses a star type herringbone gear reducer. The star type herringbone gear reducer comprises a planet carrier, a fixing ring, a sun gear, and a star gear pair formed by a planet gear and an inner gear ring, wherein the teeth of the sun gear, the teeth of the planet gear and the teeth of the inner gear ring in the star gear pair are all herringbone teeth, the sun gear is integrated, an involute spline is arranged in the sun gear, the sun gear is connected with an input shaft through the spline, the inner gear ring is formed by an upper gear ring and a lower gear ring in a combined installation mode, and the fixing gear and the inner gear ring are assembled so that torque output can be achieved. Due to the fact that the herringbone teeth are adopted, the transmission contact ratio is high, and transmission stability, the uniform load performance and the capacity for outputting torque are high; the planet gear is combined, elastic supporting of the planet gear is achieved, transmission stability of a star gear system is improved, and noise is lowered; because combined installation is adopted for the inner gear ring of the reducer and the inner gear ring is provided with the fixing ring in a matched mode, the inner gear ring torque output function is achieved. The star type herringbone gear reducer has the advantages of being simple in structure and convenient and fast to install. The star type herringbone gear reducer is suitable for engine reducers, and especially suitable for high-power engine reducers.

The invention discloses a magnetic field speed reducing type low-speed high-torque permanent brushless DC Motor, which comprises an inner stator, an external stator and a rotator between the inner and the external stators. The inner stator is composed of an inner stator core grooved along the peripheral direction and an armature winding in the groove. The external stator is composed of an annular stator core and an N pole and an S pole permanent magnet fixed on the inner surface of the annular stator core and arranged alternately. The rotator is composed of a magnetizer and a non-magnetizer arranged at intervals. In virtue of the modulation function of the rotator, the armature field causes the rotary speed of the air gap field at the inner stator side and the air gap field at the permanent magnet side to form the rotation ratio, thus realizing the speed reduction of the magnetic field. Under the function of the magnetic field with different speed at the sides of the inner stator and the permanent magnet, the speed is reduced obviously and the aim of low speed and high torque is realized. The invention simplifies the structure of a power-driven system and the motor works reliably and responds rapidly.

A control device of a hybrid vehicle, configured with an engine; a motor that rotates together with the engine at least during traveling by using a driving force of the engine, and a speed change mechanism that shifts rotation of the engine and the motor to transmit the shifted rotation to a driving wheel. A zero torque control unit controls output torque of the motor to zero torque when a rotational speed of the motor reaches a predetermined rotation speed or more by driving rotation of the engine, and a motor temperature detection unit that detects a temperature of the motor. A motor protection control units that reduces a rotational speed of the engine when the temperature of the motor reaches an upper threshold value or more while the motor is being rotated at the predetermined rotational speed or more by the driving rotation of the engine.

The invention provides a model-based gasoline engine calibration method, belongs to the technical field of gasoline engines, and designs and develops a statistical model based gasoline engine calibration method mainly for a dynamic property optimized calibration process of a gasoline engine. The model-based gasoline engine calibration method comprises the following steps: (1), design of test operating points, (2) establishment of a mathematical statistics model and (3), optimization of calibrating procedure design, wherein firstly, relatively fewer test points can be selected in a test design phase so as to reduce workload; then an engine statistical model is established with a mathematical statistics method after related data are acquired; and finally, optimized calibration is performed on the basis of the statistical model. Under the premise that the performance of the gasoline engine is improved without loss of calibration accuracy, the model-based gasoline engine calibration method has the advantages as follows: time is saved, the cost is reduced, the output torque is increased, and the problems that the traditional manual calibration method is time-consuming, labor-consuming and low in efficiency and the conventional automatic optimized calibration equipment is complicated in technology and expensive are solved.

When a cam shaft phase is changed during engine operation is stopped, a power supply increase control to an electric motor is carried out, according to which a power-supply duty ratio to the electric motor is increased to a predetermined power increase value which is necessary for moving a VVT apparatus during the stop of the engine operation. Then, the power-supply duty ratio is feedback controlled so that an actual changing speed of the cam shaft phase becomes equal to a target changing speed. As a result, the cam shaft phase can be surely changed and operating sound can be reduced by preventing the changing speed of the cam shaft phase from becoming too fast.

An electrically assisted turbocharger is provided; in the case where an internal combustion engine rotates at low rotation speed, the output thereof is secured by adjusting the flow rate in a recirculation path while supercharging with electrically assisting torque, and in the case where the internal combustion engine rotates at high rotation speed, electrically assisting torque compensates the inertia of at least a turbine wheel, a compressor impeller, and a motor; as a result, not only unnecessary consumption of electric energy is avoided, but also desired supercharging can be performed by the electrically assisted turbocharger.

The invention provides a temperature control method and device of an electric car drive motor and an electric car. The method comprises following steps: monitoring the temperature of a drive motor ofan electric car after power on; when the temperature of the drive motor is greater than a first preset temperature threshold value and less than or equal to a second preset temperature threshold value, determining the limit torque of the drive motor according to the current performance parameters of a cooling system of the electric car and the current temperature of the drive motor; the first preset temperature threshold value is the maximum temperature at which the drive motor can operate normally over the rated power range; the second preset temperature threshold value is the critical temperature value at which the drive system of the electric car is at risk of failure; the cooling system performance parameters represent the cooling effectiveness of an electric car cooling system under maximum cooling capability conditions. The invention can effectively prevent the temperature of the drive motor from further rising, and at the same time can minimize the restriction on the torque output of the drive motor, thus ensuring the driving feeling of the driver.

The invention relates to an improved-overmodulation based method for improving the alternating current motor torque output capacity. The method comprises: a current PI regulator outputting voltage vectors Ud and Uq of d and q axes according to id*, iq*, id, and iq; when the alternating current motor is operating in a non-weak magnetic region, obtaining voltage vectors Ualpha and Ubeta of alpha and beta axes by performing coordinate transformation on Ud and Uq; when the alternating current motor is operating in a weak magnetic region, obtaining optimized voltage vectors Udn and Uqn of the d and q axes by applying a voltage optimization method to Ud and Uq, and obtaining Ualpha and Ubeta by performing coordinate transformation on Udn and Uqn; setting different modulation regions according to the magnitude of Ualpha and Ubeta, and outputting corrected voltage vectors Ud* and Uq* of the d and q axes according to Ualpha and Ubeta; and finally, performing spatial voltage vector modulation to generate a switch action signal for on/off control of an IGBT in an inverter. Compared with the prior art, the method of the invention has the advantages that the bus voltage is high in utilization rate, the increase of output torque is large, and the current response is quick.