33 results about "Hysteresis band" patented technology

A data processor establishes a first range of rotational speeds of a rotor of the motor from a first lower limit to a first higher limit and a second range of rotational speeds from a second lower limit to a second higher limit. A hysteresis band or a rotational range of speeds is established such that during operation in the first range the first higher limit is adjusted (e.g., raised by a first amount to be greater than the second lower limit). A sensor detects or measures a rotational speed of a rotor of the motor. The data processor determines whether the measured rotational speed falls within the first range or the second range, as adjusted by the hysteresis band, to identify a selected speed range. A switching frequency of a pulse-width modulation signal is varied in accordance with the selected speed range.

A weight-based occupant characterization method reliably distinguishes between large and small adult occupants by dynamically adjusting a threshold used to distinguish between large and small adult occupants. The threshold adjustments effectively increase the separation between the detected weight and the threshold, minimizing oscillation of the determined characterization following an initial occupant characterization. A learning routine gradually adjusts the threshold up to a predefined maximum adjustment so long as the detected weight is within a tolerance or hysteresis band, or a locking routine produces a step change adjustment of the threshold when the detected weight is outside the tolerance or hysteresis band for at least a predefined time.

A control system for compensating a hysteresis band of a switched reluctance (SR) machine having a rotor and a stator is provided. The control system may include a converter circuit and a controller. The converter circuit may be operatively coupled to the stator and include a plurality of switches in selective communication with each phase of the stator. The controller may be in communication with each of the stator and the converter circuit, and configured to monitor at least one phase current of the SR machine relative to a current threshold of the hysteresis band, determine an adjustment value based on a difference between the phase current and the current threshold if the phase current exceeds the current threshold, and compensate the current threshold by the adjustment value.

A system and method for counting ridges in a captured print image frame is described. A pixel path through the captured print image frame is traversed. A hysteresis band for the pixel path is determined. A number of crossings of the determined hysteresis band is counted while traversing the pixel path. A number of print ridges based on the counted number of hysteresis band crossings is determined.

The invention discloses a method for controlling a power supply of an electron-optical circuit system of an electron beam furnace and a power supply device. The method takes the extraction value of an acceleration voltage sampling signal of a power supply of an electron beam generating system as a control signal for a focusing and deflection scanning power supply and the amplitude of a focusing and deflection scanning current changes linearly according to the control signal, which ensures that the operation parameter of the electron-optical circuit system is free from the influence of the fluctuation of the acceleration voltage. The power supply device has the acceleration voltage sampling signal connected with a square root extractor first and then connected to a focusing and deflection scanning power supply control circuit, and adopts a hysteresis-band current tracking pulse modulation controller to maintain a small up and down oscillation amplitude of a working current based on an expected value. An extraction value signal of the acceleration voltage sampling signal is used to control a focusing current, and a general control signal which is the produce of a deflection scanning integrated signal and the extraction value of the acceleration voltage sampling signal is used to control deflection scanning current, so the focusing and deflection scanning region of the electron beam is not influenced by the acceleration voltage, and in event of failure, the change of the focusing and deflection scanning region of the electron beam is controlled in a permitted range.

A two-terminal current controller controls a first current flowing through a parallel-coupled load. During a rising period of a rectified AC voltage, when a load voltage does not exceed a first voltage, the two-terminal current controller operates in a first mode. When the load voltage exceeds the first voltage but does not exceed a second voltage, the two-terminal current controller operates in a second mode. When the load voltage exceeds the second voltage, the two-terminal current controller operates in a third mode. When the load voltage drops to a third voltage smaller than the second voltage after exceeding the second voltage, the two-terminal current controller operates in the second mode when a difference between the second and third voltages exceeds a hysteresis band and operates in the third mode when a difference between the second and third voltages does not exceed the hysteresis band.

A motor is disclosed. A motor according to the present invention includes: a stator including a plurality of teeth that forms a plurality of slots, a through hole formed in the center by the tips of the plurality of teeth, and a coil that is wound around the teeth and generates rotating magnetic field by applying electricity; a rotator that is rotatably inserted in the through hole and has an axlehole into which a rotating axle is inserted and a plurality of permanent magnets disposed around the axle hole; and a hysteresis band that is disposed on an outer periphery of the rotator. Accordingto the present invention, since the hysteresis band is disposed on the outer periphery of the rotator, the motor can overcome the braking torque by the permanent magnets in transition state and startsnormally and generates magnetic flux in normal operation with synchronous speed, thus increasing the efficiency of the motor.

A powertrain system is described that includes a method for controlling control variables of components thereof. The method includes determining an initial state transition threshold and an associated hysteresis band of an operating parameter related to a control variable. The hysteresis band is damped based on the operation of the powertrain component at the current state of the control variable, and a preferred choice of the powertrain component is selected based on a comparison between the operating parameter and an initial state transition threshold that results in a damped hysteresis band of the operating parameter. control variable. An element of a powertrain system is controlled to a preferred state of a control variable.

The invention discloses an asynchronous motor direct torque control method based on synthesized voltage vectors. The method includes three-phase current voltage is converted under alpha and beta coordinates through 3 / 2 conversion by detecting the current and voltage of the stator end of a motor, feedback torque and stator flux linkage vectors are calculated through an estimation module, the feedback value is compared with a given value, a torque hysteresis comparator is a zero hysteresis band, and a flux linkage PI controller replaces a flux linkage hysteresis controller to reduce flux linkage trajectory distortion; voltage spatial vectors are selected from a voltage vector selecting table to obtain voltage vector output; the control voltage vectors and zero voltage vectors in a sampling cycle are synthesized into a new voltage vector in a synthesized voltage vector pulse width modulation output signal controller. The method has the advantages that the given signals can be fast tracked by the flux linkage and torque controllers without offset, torque fluctuation and flux linkage trajectory distortion are reduced evidently, torque fluctuation is reduced greatly, and torque performance of system output is increased greatly.