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| Number | Title | Issue Date |
| 7952318 | System and method for determining stator winding resistance in an AC motor A system and method for determining stator winding resistance in an AC motor is disclosed. The system includes a circuit having an input connectable to an AC source and an output connectable to an input terminal of an AC motor. The circuit includes at least one cont... | 05/31/2011 |
| 7659687 | Intelligent drive The invention relates to an electric drive (19) provided with a drive regulator (5), an electromotor (9) and a control device (3, 4, 7, 8) which is used to detect and monitor the threshold value of axis-relevant, electrical/mechanical ope... | 02/09/2010 |
| 7622885 | Linear electric motor controller and system for providing linear control The invention relates to a method of, and system for, linear speed control for an electric motor, in which a digital to analog converter means is used for converting an 8-bit digital signal to an analog voltage for setting voltage across a motor, a digital state mac... | 11/24/2009 |
| 7612520 | Method for operating a delta wound three-phase permanent magnet brushless motor Method for operating a delta wound three-phase permanent magnet brushless motor. A transition speed is determined in a quadrant of a speed versus torque curve above which speed continues to increase while current/torque decreases wherein actual phase current can be ... | 11/03/2009 |
| 7602139 | Signal conditioning apparatus and method for determination of permanent magnet motor rotor position An apparatus and method for estimating rotor angle information for the control of permanent magnet AC motors having sinusoidal current excitation. The disclosed motor drive can provide full load operation at very low speeds including zero speed without the use of a ... | 10/13/2009 |
| 7602138 | Driving apparatus and driving system for electric motor An apparatus for controlling the drive of an electric motor, having a current detector for detecting the current through an externally connected electric motor; a controller for generating a control signal to control the electric motor on the basis of the current de... | 10/13/2009 |
| 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 |
| 7432683 | PWM pattern sequence to reduce losses in voltage source inverters A method for controlling an inverter uses sequences of predetermined states where each state uniquely corresponding to a set of control signals provided to the inverter that is coupled to a motor. The method includes repeatedly applying a first center null timing se... | 10/07/2008 |
| 7394629 | Motor overload tripping system and method with multi-function circuit interrupter A technique is provided for controlling operation of motors of different sized or ratings. Components used to apply and interrupt current to the motors may be shared in control devices for the different motors. The components may include contactors or circuit interr... | 07/01/2008 |
| 7358694 | Apparatus and method for determining normal start up of sensorless motor An apparatus and method determine a start-up of a sensorless motor. The apparatus includes an elapsed time determination unit, a motor velocity determination unit and an abnormal start-up determination unit. The elapsed time determination unit determines whether a p... | 04/15/2008 |
| 7323845 | Apparatus for controlling operation of compressor and method therefore Provided is an apparatus for controlling an operation of a compressor which can always apply a constant voltage to the compressor without noise and a method therefor. The apparatus for controlling the operation of the compressor includes: a triac electrically connec... | 01/29/2008 |
| 7304398 | Spring activated energy transducer generating A/C electricity from natural forces-frictionless magnetic plate A spring activated energy transducer is provided. The energy transducer of the current invention generates alternating current (A/C) electricity from abundant external natural forces. The energy transducer is comprised of an upper part and a lower part. The upper pa... | 12/04/2007 |
| 7301299 | Injection molding machine and a control method of an injection molding machine An injection molding machine has a control device which controls an input to an incorporated motor. The control device sets a setting value a setting value of the motor to be held for a predetermined setting time. Additionally, the control device determines a reduct... | 11/27/2007 |
| 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 |
| 7271579 | AC signal level detection circuit An AC voltage generated by an AC power source 1 is rectified by a full-wave rectifying circuit 2, which generates a rectified voltage. An internal regulator 33 performs waveform shaping of the rectified voltage. A comparator 42 compares t... | 09/18/2007 |
| 7272302 | PSC motor system for use in HVAC applications with field adjustment and fail-safe capabilities A field-adjustable motor control system includes a motor, an inverter coupled to provide energization to the motor, a controller coupled to the inverter, and a field adjustment circuit that provides field adjustment signals to the controller. The controller provides... | 09/18/2007 |
| 7265516 | Linear electric motor controller and system for providing linear control The invention relates to a method of, and system for, linear speed control for an electric motor, in which a digital to analog converter means is used for converting an 8-bit digital signal to an analog voltage for setting voltage across a motor, a digital state mac... | 09/04/2007 |
| 7265954 | Method for estimating DC motor coil temperature, DC motor control method and their devices Resistance of the coil of a DC motor is calculated by using the motor current and the motor voltage, and the coil temperature is estimated by using the resistance-temperature characteristics of the coil. ... | 09/04/2007 |
| 7248988 | System and method for reducing temperature variation during burn in Systems and methods for reducing temperature variation during burn-in testing. In one embodiment, power consumed by an integrated circuit under test is measured. An ambient temperature associated with the integrated circuit is measured. A desired junction temperatur... | 07/24/2007 |
| 7245105 | Single-phase induction motor and method for reducing noise in the same A single-phase induction motor and a method for reducing noise in the same, which can eliminate unbalance between magnetomotive forces of main and auxiliary windings in a stator of the motor, thereby implementing a low noise, low vibration motor, and can also achiev... | 07/17/2007 |
| 7235937 | Traction motor control system For controlling a traction motor of a vehicle, a current command value is determined based on a torque command and a load value representative of running load of the vehicle. A voltage command value is calculated in such a manner that a difference between the curren... | 06/26/2007 |
| 7227331 | Safety interlock and protection circuit for permanent magnet motor drive A circuit for protecting against controller failure wherein the controller provides control signals for controlling a DC to AC inverter fed by a DC bus and driving a permanent magnet motor, the circuit comprising a first circuit for monitoring the DC bus voltage and... | 06/05/2007 |
| 7215055 | Vehicle A rotating electric machine comprises a stator having stator salient poles, three-phase windings wound around said stator salient poles, a rotor rotatable held inside the said stator, and permanent magnets inserted into said rotor and positioned opposite to said sta... | 05/08/2007 |
| 7215092 | Radio-linked, bi-directional control system for model electric trains A wireless system uses a direct UHF radio frequency (RF) signal to control electric trains and train accessories. A controller, such as a handheld unit used by the toy train operator, accepts control commands and transmits encoded control data over a high frequency ... | 05/08/2007 |
| 7196491 | System and method for stall detection of a motor A motor starter system comprises solid state switches for connection between an AC line and motor terminals for controlling application of AC power to the motor. A voltage sensor senses AC line voltage and the motor terminal voltage. Current sensors sense motor curr... | 03/27/2007 |
| 7191826 | Variable speed fan motor control for forced air heating/cooling system A fan motor speed control system for controlling the fan motor speed of an air conditioning system includes a power output circuit including a power triac which is turned on and off by an opto-isolator connected to a pulse generator circuit for varying an AC voltage... | 03/20/2007 |
| 7187155 | Leakage inductance saturation compensation for a slip control technique of a motor drive An electronic drive for vector control of an induction motor controls slip and operating frequency in response to changes in stator voltage. The drive includes a torque control loop, a flux control loop and a frequency control loop. The control is based on a command... | 03/06/2007 |
| 7183740 | Motor drive apparatus, vehicle having the same mounted therein, and computer readable storage medium having a program stored therein to cause computer to control voltage conversion A control device receives a power supply current from a current sensor and a reactor current from a current sensor and detects a maximum value and a minimum value from the reactor current and from the detected maximum and minimum values and the power supply current ... | 02/27/2007 |
| 7183741 | Switch assembly, electric machine having the switch assembly, and method of controlling the same A pump assembly for pumping a liquid and a method of controlling the pump assembly. The pump assembly includes a motor coupled to a pump, and an electronic switch assembly electrically connected to the motor to control the current through the motor. The electronic s... | 02/27/2007 |
| 7176649 | DC motor control apparatus and recording apparatus When torque of a DC motor is dropped down to zero at a stop position, force is generated by deformation of a member for transmitting the torque of the DC motor. The force moves the driven body which is in the stopped state, which results in a shift of the driven bod... | 02/13/2007 |
| 7170249 | Electrical phase compensation in BEMF spindle motor control A method and apparatus for compensating for the asymmetrical phases of a spindle motor in a disc drive are provided. With the apparatus and method, compensation values are learned by sampling speed data during a period of operation of the disc drive where the speed ... | 01/30/2007 |
| 7166979 | Method for controlling a windscreen-wiping device, and windscreen-wiping device for a motor vehicle A method for the open-loop control of a wiper system (10), and a wiper system (10), in particular for a motor vehicle includes at least one drive device (16), at least one gear (14), which switches the motion of the drive device (16 | 01/23/2007 |
| 7151354 | Magnetic noise reduction method for AC rotary electric machine, and motor control apparatus and AC rotary electric machine apparatus using the same The invention provides techniques for reducing or altering the magnetic noise of an AC rotary electric machine. A magnetic noise reducing harmonic current of order n, whose frequency is n times the frequency of the fundamental frequency component of a polyphase AC c... | 12/19/2006 |
| 7141953 | Methods and apparatus for optimal voltage and frequency control of thermally limited systems Methods, apparatus, and articles of manufacture control a device or system that has an operational limit related to the rate or frequency of operation. The frequency of operation is controlled at a variable rate calculated to maximize the system or apparatus perform... | 11/28/2006 |
| 7135794 | Spring support having a height-adjustable spring plate Spring support having at least one axially moveable spring plate, an actuator with a rotor producing a rotational movement relative to its stator, which is converted into an axial movement of the spring plate, and a torsional locking element which prevents torsional... | 11/14/2006 |
| 7135830 | System and method for identifying operational parameters of a motor A system and method for establishing estimated values of electrical parameters of a motor. The electrical parameters may be established from stator resistance data and motor data obtained at a single load on the motor. The electrical parameters also may be establish... | 11/14/2006 |
| 7116077 | Diagnostic system and method for an electric motor using torque estimates The present invention can diagnose a potential discrepancy in electrical operating characteristics of a three phase electric motor by generating two independent torque estimates using a plurality of current sensors and a shaft position sensor. The invention provides... | 10/03/2006 |
| 7109447 | Control system for cooking appliance employing convection and radiant cooking A cooking appliance includes a heating system which is preferably capable of combining radiant, convection, microwave and conduction heating techniques to perform a cooking operation. The cooking appliance includes a convection fan and at least one heating device. A... | 09/19/2006 |
| 7102323 | High power density/limited DC link voltage synchronous motor drive A method and an apparatus optimize performance of a motor drive system. The method according to one embodiment comprises: selecting a property for a rated operation point; selecting inverter system characteristics and motor characteristics such that a motor drive sy... | 09/05/2006 |
