Class / Patent application number | Description | Number of patent applications / Date published |
318400030 | Plural reference comparison (e.g., reference changes during startup, upper/lower reference, etc.) | 13 |
20090256504 | MOTOR DRIVE DEVICE - A motor drive device for alternately driving a plurality of motors includes a position detection signal processing circuit for processing position detection signals of the plurality of motors, a pre-drive circuit for generating an excitation switching signal of the motors, a plurality of power switching circuits for supplying an electric current to the motors in response to an output from the pre-drive circuit, and a motor switching circuit for instructing a switchover of driving the motors. The position detection signal processing circuit, in response to an input signal to the motor switching circuit, selects a position detection signal of a motor to be driven out of the position detection signals of the plurality of motors, and inputs a position detection processed signal to the pre-drive circuit for selecting one of the plurality of power switching circuits. | 10-15-2009 |
20100001668 | BRUSHLESS MOTOR DRIVING CIRCUIT AND MOTOR HAVING THE SAME CIRCUIT - A brushless motor driving circuit includes a deviation detector for receiving a PWM input signal, which issues an instruction for rpm control, and detecting a deviation from duty ratio 50% of the PWM input signal, a determiner for detecting a comparison result at a threshold of duty ratio 50%, and a PWM output circuit for receiving a PWM reference signal having a duty ratio 50%, and producing a PWM driving signal, to be used for driving a brushless motor, in response to the deviation and the comparison result. The PWM driving signal is produced by adding the deviation to the PWM reference signal when the duty ratio of the PWM input signal is over 50%, and by subtracting the deviation from the PWM reference signal when the duty ratio is less than 50%. | 01-07-2010 |
20110006710 | POWER CONVERTER FOR ELECTRIC ROTATING MACHINE - A power converter for an electric rotating machine is provided which is designed to ensure a desired length of a current flywheel duration in which current is permitted to freewheel from the electric rotating machine even if the power converter is in a transient state or subjected to an unexpected change. The power converter is equipped with a controller and a switching circuit which is disposed between a power supply and windings of the electric rotating machine. The switching circuit has switches grouped into an upper and a lower arm. The controller works to control an off-operation of one of the switches of one of the upper and lower arm so as to produce a desired length of the current flywheel duration following turning off of the one of the switches, thereby minimizing a loss of rectification and avoiding the backflow of current from the power supply to the windings. | 01-13-2011 |
20120212165 | METHOD AND APPARATUS FOR ESTIMATING ROTOR ANGLE AND ROTOR SPEED OF SYNCHRONOUS RELUCTANCE MOTOR AT START-UP - A method of estimating a rotor angle of a synchronous reluctance motor, which includes a stator and a rotor. First, a stator flux and a stator current are determined. Two orthogonal stator flux components in a stator reference frame are calculated from the stator flux. Two orthogonal stator current components in the stator reference frame are calculated from the stator current. A rotor orientation vector is then calculated using a known rotor direct or quadrature axis inductance component, the stator flux components, and the stator current components. The rotor orientation is estimated on the basis of the rotor orientation vector. | 08-23-2012 |
20130099703 | Electro-motive machine using halbach array electrons trapped in electromagnetic coils and using hybrid coils to harvest back electromotive force - A Halbach array is radially disposed in an environment optimized for efficiency and controlled for efficient generation and use of power in order to generate, establish, and maintain a desired level of rotational energy with enhanced efficiency and in order to make the most efficient use of electromotive forces and magnetic fields which are either intentionally created for the operation of the apparatus or which result from the operation of the apparatus. | 04-25-2013 |
20140015458 | Method and System for Controlling a Motor - A method and system for controlling a motor is provided. In particular, various embodiments of the present disclosure describe a method and system for controlling a spindle motor in a hard disk drive (HDD) A method of controlling a motor is provided, the motor including a 3-phase synchronous motor with three terminals of an electromagnetic winding configuration. The method includes providing an input voltage between two of the terminals and measures a resultant silent terminal voltage at the third terminal, which is thereafter used in determining a rotor position. A corresponding system for controlling a motor is further provided. | 01-16-2014 |
20140312813 | AIR MOVING APPLIANCE WITH ON-BOARD DIAGNOSTICS - An air moving appliance comprising an electric motor coupled to a fan, a control system for controlling the motor, the control system including monitoring means configured to monitor a motor load parameter; memory means configured to store a predetermined reference motor load parameter value; compensating means that determines a compensated reference motor load parameter value based on the predetermined reference motor load parameter value and a set of ambient environment input conditions; comparison means configured to compare the motor load parameter and the compensated reference motor load parameter value and trigger an operational event based on the result of the comparison. The invention also relates to a method of controlling an air moving appliance. | 10-23-2014 |
20140312814 | METHOD AND ASSEMBLY FOR OPERATING SYNCHRONOUS MOTORS - A method is disclosed for operating a synchronous machine by way of a three-phase AC power controller, which is connected to a three-phase network. The embodiment of the method includes determining the phase difference between the magnet-wheel voltage of the synchronous machine and the network voltage of the three-phase network; determining the rotational speed of the rotor of the synchronous machine; determining the phase position of the three-phase network; determining a decision characteristic number on the basis of a stored data table calculated in advance, which data table associates a decision characteristic number with value triples of phase difference, phase position, and rotational speed; and determining at least one switching time point on the basis of the decision characteristic number. | 10-23-2014 |
20150137718 | Controlling a Motor with Two or More Hall Sensors - A motor system includes a motor including two Hall sensors configured to output binary values, and a controller configured to control the motor. The two Hall sensors are placed 120 or 60 electrical degrees apart. The controller is operable to monitor output signals of the two Hall sensors and to determine a third Hall sensor output binary value. The controller is operable to fulfill the commanded requirements to operate in a servo system, by controlling commutation of a drive current into the motor, and by keeping track of the motor rotor position based on the third generated signal and the outputs of the two Hall sensors. | 05-21-2015 |
20150326155 | METHOD FOR REDUCING PERFORMANCE DEGRADATION DUE TO REDUNDANTCALCULATION IN HIGH INTEGRITY APPLICATIONS - The present disclosure relates to a method of advanced motor control that reduces the resource demands (e.g., run-time) used to meet safety requirements by running a reduced portion of feedback control loop processes twice. In some embodiments, the method performs a plurality of processes within a feedback control loop of a motor control process configured to control operation of a motor. Performance of a first portion of the plurality of processes, which is less than the plurality of processes, is repeated within the feedback control loop. Performance of a second portion of the plurality of processes is not repeated within the feedback control loop. By repeating performance of first portion of the plurality of processes that is less than the plurality of processes, the method is able to improve performance of a motor by reducing run-time of the motor control process. | 11-12-2015 |
20160087560 | DC MOTOR CONTROL OVER WIDE DYNAMIC RANGE - Various examples are provided for brushless direct current (DC) motor control over a wide dynamic range. In one example, among others, a system including a power drive coupled to a DC motor and a MCU configured to control commutation of the DC motor based upon shaft speed of the DC motor, where the MCU transitions between a motion-based commutation mode and a time-based commutation mode in response to a comparison of the shaft speed with a predefined threshold. In another example, a method includes commutating a DC motor in response to a transition in rotor position of the DC motor and transitioning from a motion-based commutation mode to a time-based commutation mode in response to a comparison of shaft speed of the DC motor to a predefined threshold. | 03-24-2016 |
20160105134 | Controlling a Motor with Two or More Hall Sensors - A motor system includes a motor including two Hall sensors configured to output binary values, and a controller configured to control the motor. The two Hall sensors are placed 120 or 60 electrical degrees apart. The controller is operable to monitor output signals of the two Hall sensors and to determine a third Hall sensor output binary value. The controller is operable to fulfill the commanded requirements to operate in a servo system, by controlling commutation of a drive current into the motor, and by keeping track of the motor rotor position based on the third generated signal and the outputs of the two Hall sensors. | 04-14-2016 |
20160190960 | Motor- Driven Apparatus And Method For Driving The Same - A motor-driven apparatus in one aspect of the present disclosure includes: a brushless motor; a full-wave rectifier circuit; a drive circuit; a controller; and a forcible stop unit. The forcible stop unit performs a forcible stop control to temporarily forcibly stop a switching operation of a plurality of switching elements during a stop period when a full-wave rectified voltage is smaller than an induced voltage generated by a plurality of coils, and the switching operation of the plurality of switching elements is to be stopped. | 06-30-2016 |