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A self defense weapon formed as a memo pad and which is easily held by a person's fingers, therefore making it possible to provide protection from a mugger and also to quickly and easily write a record or a message without failure of missing or forgetting significant information under a stressful situation.
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| Number | Title | Issue Date |
| 8179064 | Electric motor protection system An electric motor protection system for protecting an electric motor of a household appliance includes a temperature sensor for sensing a temperature of the electric motor, a motor speed sensor for sensing a speed of the electric motor, a current sensing circuit for... | 05/15/2012 |
| 8129935 | Motor control device A motor control device includes: a motor-current detection unit; a rotational-angular-speed calculation unit for calculating a rotational angular speed of a motor; a rotational-angle-change-amount calculation unit for multiplying the rotational angular speed by a pr... | 03/06/2012 |
| 8076879 | Fan controlling circuit A fan controlling circuit for detecting rotational speed of a fan, includes a comparison circuit and a controlling chipset. The comparison circuit receives a rotational speed signal from the fan at one input terminal, a reference voltage at another input terminal, a... | 12/13/2011 |
| 8035333 | Fan motor speed control circuit, fan apparatus, and electronic apparatus A fan motor speed control circuit includes: a driving circuit configured to drive a fan motor so as to run at a rotation speed corresponding to a drive signal; a comparison circuit configured to output a comparison signal for matching a rotation speed of the fan mot... | 10/11/2011 |
| 7932692 | Control system for rotary electric machine with salient structure In a system for controlling rotation of a rotor of a multiphase rotary electric machine in relation to a stator thereof, a superimposing unit superimposes a first frequency signal on the input signal to the multiphase rotary electric machine. The first frequency sig... | 04/26/2011 |
| 7923959 | Rotor driving control device and image forming apparatus A device of a motor with a rotation control means that decreases the fluctuation of its rotation period. The control is carried out based on the amplitude and the phase generated by amplitude-and-phase generating devices, detecting passage time of detected portions ... | 04/12/2011 |
| 7859207 | Method and apparatus for controlling electric motor A method for controlling a motor current supplied to an electric motor by using an inverter device is provided. The inverter device includes an inverter circuit and a capacitor connected to an input of the inverter circuit. The method includes controlling the invert... | 12/28/2010 |
| 7859206 | Motor controller and electric power steering apparatus A microcomputer includes a calculating section calculating a d-axis electric current command value and a q-axis electric current command value and a signal generating section. The signal generating section generates a motor control signal through feedback control in... | 12/28/2010 |
| 7847510 | Controlling switching of thyristors to reduce power loss in variable speed motor Systems and/or methods that facilitate efficiently controlling speed of an induction motor are presented. An optimized control component controls respective switching of an auxiliary switch component associated with an auxiliary winding of the motor, a main switch c... | 12/07/2010 |
| 7777442 | Method of controlling the speed of an electric motor A method of controlling the speed of an electric motor, said method being a digital method designed to control the speed of an induction motor that is powered by a triac device to a preset speed, in which the speed of the motor is measured and a digital numerical va... | 08/17/2010 |
| 7750594 | Control of electrical machines An electrical machine, such as a switched reluctance motor, has a rotor and at least one electrically energizable phase winding. A control map is derived during production that includes a predetermined advance angle profile representing the energization of the phase... | 07/06/2010 |
| 7652441 | Method and system for starting a sensorless motor A motor drive system for a sensorless motor includes a catch start sequencer that controls the motor drive system to robustly start the motor in the event the motor rotor is rotating in forward or reverse direction prior to activating the motor drive system. In part... | 01/26/2010 |
| 7589489 | Method and arrangement for controlling the electricity supply of an electronically commutated motor A control circuit (150) for controlling the current supplied to a winding strand (102) in an electric motor (143). The control circuit comprises at least one semiconductor switch (106) and a control unit (108) for controlling the s... | 09/15/2009 |
| 7545114 | Parameterization method for a converter and converter implementing the method The present invention relates to a parameterization method for a converter (1, 2) of the speed controller type, the said converter (1, 2) being connected to an electrical load (3) by means of an electrical cable (4) comprising at least tw... | 06/09/2009 |
| 7538514 | Systems and methods for controlling torque of a motor A system and a method for controlling torque of a motor are provided. The method includes modifying a phase advance angle based on an identified phase coil that has a faulted condition, a type of fault condition, and a polarity of a commanded torque to obtain a desi... | 05/26/2009 |
| 7535188 | Motor driving apparatus, motor driving method and disk driving apparatus A motor driving apparatus includes a neutral point difference voltage detecting unit operable to detect a difference voltage between a virtual neutral point of a resistor circuit connected in parallel to motor coils and an actual neutral point which is a common conn... | 05/19/2009 |
| 7501786 | Stabilizer control apparatus In a stabilizer control apparatus for transmitting a power through a speed reducing mechanism, a rolling motion of a vehicle body is restrained smoothly and rapidly, without being affected by transmitting efficiency of the speed reducing mechanism. As for a stabiliz... | 03/10/2009 |
| 7443127 | Apparatus and method for motor control using table In an apparatus of controlling a motor in a battery vehicle, a current command generation section has a table, and generates an exciting command current and a torque command current by referring to the table based on a torque command. A converting section generates ... | 10/28/2008 |
| 7443130 | Motor driving control device In a motor driving control device, a high-frequency alternating voltage or rotation voltage (having a frequency of ωh) is applied to a motor so that magnetic saturation occurs in the motor, thereby extracting, from a γ-axis current, a high-frequency sec... | 10/28/2008 |
| 7429847 | Motor control device A controller performs processing for calculating a main torque control value, processing for outputting a final control torque value based on the main torque control value and a vibration-suppression torque control value for mitigating torque fluctuation that occurs... | 09/30/2008 |
| 7411370 | Vector controller of induction motor Provided is a vector control apparatus for an induction motor which is capable of obtaining stable rotation in a short period of time for adjustment even at the time of low-speed operation by increasing the SN ratio of an output voltage to suppress the arithmetic er... | 08/12/2008 |
| 7408322 | Device for determining constant of rotating machine A device for determining a constant of a rotating machine includes: a test number selector outputting a test number n, selected from 1 to N (N≧2), and outputting a phase signal q determined by a predetermined condition that is previously set based on the test numb... | 08/05/2008 |
| 7403700 | Motor control device A motor control device is used to control a motor to rotate. The motor control device includes a phase-wave signal sampling module, a first waveform modulating module, a second waveform modulating module and a control signal integrating module. The phase-wave signal... | 07/22/2008 |
| 7362071 | Rotation control device, rotation control method and construction machine In an electric rotary excavator (construction machine) 1, when earth pressure acts on a rotary body 4 in an opposite direction to an instructed direction of a lever, a control-system changing means 150 of a rotation control device 100 inc... | 04/22/2008 |
| 7342380 | System and method for adjustable carrier waveform generator A system and method for controlling an inverter of a motor control unit includes a controller having a user interface configured to allow user selection of a waveform increment value or a waveform amplitude threshold. The controller also includes an integrator confi... | 03/11/2008 |
| 7342372 | Method for power control of an electric motor The invention relates to a method for power control of an electric motor, in particular a motor for driving the suction fan of a vacuum cleaner connected to an AC mains power supply. The power control is effected by varying the phase angle of the electric alternatin... | 03/11/2008 |
| 7342371 | System and method for detecting motor run condition A motor control system for detecting motor run condition comprises power switches for connection to an AC line for controlling application of AC power to the motor. An input receives a motor start command. A controller is connected to the input and controls operatio... | 03/11/2008 |
| 7332888 | Driving apparatus for a motor A motor driving apparatus includes: a current instruction calculator, for calculating a current instruction value based on a deviation between a speed instruction value and an estimated speed value; a current controller, for controlling an output current based on th... | 02/19/2008 |
| 7330326 | Recordable disk rotational speed error correction circuit An error correction circuit for determining an error in rotational speed of a recordable disk of a disk drive includes a sinusoidal error calculation portion adapted to generate a true oscillation error signal, and a summation portion adapted to combine the true osc... | 02/12/2008 |
| 7312550 | Architecture for electric machine In one aspect, an alternator is described which includes a current control apparatus including a stator winding and a control winding, wherein current control in the control winding regulates the stator winding. In another aspect, a gas turbine engine includes a mul... | 12/25/2007 |
| 7310475 | Motor driving apparatus A motor driving apparatus is provided which can minimize ripple current flowing through a DC link capacitor, and downsize the motor driving apparatus. It synchronizes the frequency of the inverter carrier signal for driving an inverter with the frequency of the DC/D... | 12/18/2007 |
| 7304872 | Power supply A modular, low weight impedance dropping power supply with battery backup is disclosed that can be connected to a high voltage AC source and provide electrical power at a lower voltage. The design can be scaled over a wide range of input voltages and over a wide ran... | 12/04/2007 |
| 7305297 | Controller for controlling a plant The present invention provides a controller for controlling a modeled plant robustly against disturbance. The controller comprises an estimator and a control unit. The estimator estimates disturbance applied to the plant. The control unit determines an input to the ... | 12/04/2007 |
| 7288922 | Control apparatus for automotive alternator having capability to accurately detect temperature of alternator A control apparatus for a vehicle generator includes a switch, a regulator, a fault condition detector, and a PWM signal generator. The switch is selectively turned on and off so as to intermittently excite the generator. The regulator controls on/off operation of t... | 10/30/2007 |
| 7289591 | Counter circuit for controlling off-chip driver Disclosed herein is a counter circuit for controlling an off-chip driver, wherein hexadecimal number counting is performed using a N (N is a natural number) number of T-flip-flops. The plurality of the T-flip-flops performs a hexadecimal number counting operation to... | 10/30/2007 |
| 7279859 | EC motor and method for operating same In a method for operating an EC motor, position-measurement signals are recorded by a position-measuring device, and, on the basis of the position-measurement signals, commutation instants are determined, at which the current supply to the EC motor is commutated. At... | 10/09/2007 |
| 7279865 | Method and apparatus for monitoring motor status using induced motor voltage A motor drive unit includes a controller, a voltage inverter, and a speed estimator. The controller is operable to generate at least one command signal for controlling a motor associated with the motor drive unit. The voltage inverter is operable to generate motor d... | 10/09/2007 |
| 7274161 | Motor driving apparatus A Motor driving apparatus adjusts activation start timing of high-side activation control signals UU, VU, WU and the low-side activation control signals UL, VL, and WL with a state determination signal SJ in an activation controller 40, in the period from sta... | 09/25/2007 |
| 7262578 | Direct control of an induction motor This invention relates to sensorless control (i.e. without encoder at the motor shaft) of an induction motor (AC asynchronous motor). In particular, the invention comprises a method for a direct measurement of the electromotive forces (EMF) at the stator of the moto... | 08/28/2007 |
| 7262577 | Method for estimating the sum of stator and rotor resistances A method for estimating the sum of the stator and rotor resistances of an induction machine using a frequency converter when the frequency converter is connected to the induction machine. The method comprises the steps of controlling the stator current of the induct... | 08/28/2007 |
