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| Number | Title | Issue Date |
| 8154228 | Dynamic braking for electric motors A system and method are provided for improved dynamic braking in AC motors with an electronic drive, and more particularly to using a current regulation circuit to control the current supplied to the motor to be in phase with the internal EMF voltage of the motor su... | 04/10/2012 |
| 8120294 | Power transducer The performance of a power transducer is improved while efficiently using a power semiconductor also by managing the permissible duty factor of the power semiconductor in the regenerative braking circuit provided in the power transducer. The user is allowed to set, ... | 02/21/2012 |
| 7906922 | Electric motor drive employing hybrid, hysteretic/pulse-width-modulated dynamic braking A dynamic braking circuit for an electronic motor drive shunts the DC link of the drive with a resistor using two control strategies. The first control strategy used for lower levels of braking employs a pulse width modulated signal and the second control strategy u... | 03/15/2011 |
| 7696706 | Fan system and real-time stopping device thereof A fan system includes a stator magnetic pole, a driving unit and a real-time stopping unit. The driving unit is coupled with the stator magnetic pole and controls a polarity change of the stator magnetic pole in accordance with a driving signal. The real-time stoppi... | 04/13/2010 |
| 7675255 | Back EMF reduction in a storage drive using pulse width modulation in a closed loop motor control system A storage drive implements a method for a BEMF voltage reduction during a deceleration period of an electric motor of the storage drive. In operation, the electric motor is disconnected from a power supply during an entirety of the deceleration period of the electri... | 03/09/2010 |
| 7629759 | Kit and method for reconfiguring an electrical braking system for a traction vehicle A kit and method for reconfiguring an electrical braking system for a traction vehicle are provided. The kit may include a braking system assembly including a chopper having a first chopper circuit topology. The first chopper circuit topology includes a first semico... | 12/08/2009 |
| 7592764 | Method and apparatus for driving a DC motor A circuit for determining a direction of rotation of an electric motor, the motor having asymmetry and/or eccentricity in a profile of back electromotive force as a function of angular position of a rotor with respect to a stator, the circuit receiving a signal repr... | 09/22/2009 |
| 7567044 | Braking device for an electrically driven rotor A braking device for an electrically driven rotor comprises a drive signal generating circuit for an electrically driven rotor, an output stage, a motor for the electrically driven rotor, driven by the output stage, and a monitor circuit for detecting interruption o... | 07/28/2009 |
| 7554278 | Load-lifting apparatus and method of storing energy for the same A load-lifting apparatus has one or more prime power sources, one or more energy storage systems and regenerative braking. Regenerative energy is recovered when the load-lifting apparatus lowers its load. The elements of the prime power sources, energy storage devic... | 06/30/2009 |
| 7466091 | Brake responsive vehicle electric drive system The invention relates to a vehicle electric drive system. There is a need for a brake responsive vehicle electric drive system. A vehicle electric drive system includes an internal combustion engine, an electric motor/generator driven by the engine, and drive wheels... | 12/16/2008 |
| 7423393 | Car control method and car control apparatus A car control apparatus including a wheel sensor, wheel torque calculating means for calculating wheel torque from the wheel speed, drive force detecting means for detecting drive force generated by an electric motor, car body drive force calculating means for calcu... | 09/09/2008 |
| 7414376 | Motor drive apparatus and method and electrically driven brake apparatus In such a product that torque of a motor is continuously generated when a rotation number of the motor is nearly equal to zero, since an output voltage is kept at a constant value in accordance with a rotation position of the motor, such a condition that currents ar... | 08/19/2008 |
| 7408791 | Frequency converter assembly and method of using frequency converter assembly A frequency converter assembly comprising a direct-voltage circuit and brake chopper means, the direct-voltage circuit including a first branch (DC+) and a second branch (DC−), and the brake chopper means including a first terminal (BRK+), a second terminal (BRKâˆ... | 08/05/2008 |
| 7375483 | Mesh connected brake array for electrical rotating machines In the present invention, several polyphase devices are connected together: an inverter, and electrical rotating machine, and a resistive load or braking resistor. The purpose of the resistive load is to dissipate excess electrical power which may be produced when t... | 05/20/2008 |
| 7375490 | Methods for managing electrical power Certain exemplary embodiments comprise a system comprising a plurality of Active Front End units adapted to be electrically coupled to a direct current (DC) bus. Each of the plurality of Active Front End units can be adapted to be electrically coupled to a separate ... | 05/20/2008 |
| 7372227 | Apparatus for braking a synchronous machine A method is proposed for braking a synchronous machine 1, with the armature windings (u, v, w) of the synchronous machine 1 being short-circuited, optionally by interposing at least one braking resistor. In order to keep the braking moment constant ove... | 05/13/2008 |
| 7368889 | Motor control apparatus and control method thereof A motor control apparatus supplying AC power to a motor having a plurality of motor windings having an inverting part including a bridge circuit having a plurality of switching units, and supplying the AC power to the motor; brake relays short circuiting the motor w... | 05/06/2008 |
| 7365505 | Image forming apparatus using noise-resistant motor control device An apparatus for controlling a rotational motion of a motor is disclosed which includes: a signal generator generating a rotational state signal indicative of a rotational state of the motor; and a controller producing a control signal for controlling the rotational... | 04/29/2008 |
| 7359174 | Motion detecting system for use in a safety system for power equipment A woodworking machine including a detection system adapted to detect a dangerous condition between a person and a working portion of the machine is disclosed. The machine includes a reaction system associated with the detection system to cause a predetermined action... | 04/15/2008 |
| 7353737 | Miter saw with improved safety system A miter saw is disclosed having a base, a blade supported by the base, a detection system adapted to detect a dangerous condition between a person and the blade, and a reaction system associated with the detection system to cause a predetermined action to take place... | 04/08/2008 |
| 7350444 | Table saw with improved safety system A table saw having an adjustable blade, a detection system to detect contact between a person and the blade, and a brake mechanism to engage and stop the blade upon detection of contact between the person and the blade is disclosed. The saw includes a brake position... | 04/01/2008 |
| 7342376 | Glass machinery motor control A machine for operating on a glass bottle. A carriage is displaceable by a servo motor having three lead lines. The rotation of the servo motor is stopped when power has been removed by shorting regenerative resistors to the three motor leads. The stopped servo moto... | 03/11/2008 |
| 7337863 | Circuit arrangement for the control of at least one electric machine The objective of providing a circuit arrangement for the control of at least one electric machine (1), which is suitable for also enabling operating conditions of the electric machine (1) that demand high power-peaks of short duration, is essentially a... | 03/04/2008 |
| 7312593 | Thermal regulation of AC drive An apparatus for the thermal regulation of an AC drive for providing power to a motor includes a temperature sensor producing a signal indicative of temperature, a heater resistor connectable across a DC link of the AC drive, and a first switch. A controller is oper... | 12/25/2007 |
| 7308352 | Enhanced braking system and method Certain exemplary embodiments can provide for automatic power control and/or torque boost for retarding a machine that considers a machine weight and/or a machine slope. The automatic power control and/or torque boost can provide a control margin under retard. Certa... | 12/11/2007 |
| 7307399 | Systems for managing electrical power Certain exemplary embodiments comprise a system comprising a plurality of Active Front End units adapted to be electrically coupled to a direct current (DC) bus. Each of the plurality of Active Front End units can be adapted to be electrically coupled to a separate ... | 12/11/2007 |
| 7294985 | Steering controlling device A steering controlling device comprising a power source, a motor connected to a steering system, a motor driving circuit converting a power source voltage to a predetermined voltage and applying the voltage to the motor, and a controlling means for controlling the m... | 11/13/2007 |
| 7291997 | Servo system A motor has built therein a brake for stopping the rotation of the motor and a brake controlling circuit for controlling the brake. The motor is further provided with a bypass circuit for supplying an electric power directly to the brake and a terminal for connectin... | 11/06/2007 |
| 7285930 | Method and device for controlling a multiphase electronically commutated motor A method is specified for controlling a multiphase motor that is commutated by an inverter-side bridge circuit, in the course of which a particularly precise and technically simple detection of a control-relevant variable of a considered motor phase, in particular o... | 10/23/2007 |
| 7285927 | Control apparatus for electric motor of inverter system and control apparatus for electro mechanical brake A relay switch for selectively connecting a power supply line of an inverter to a ground line is inserted between the inverter and a power source, and a power consumption unit such as a resistor element is inserted between the relay switch and ground line. ... | 10/23/2007 |
| 7277782 | Control system and method for electric vehicle An electric traction vehicle is described herein which may be used to provide power to off-board electric power-consuming systems or devices. The electric traction vehicle may provide 250 kilowatts or more of three phase AC power to an off-board electric power consu... | 10/02/2007 |
| 7268508 | Direct current motor control circuit and wiper system using said circuit The invention relates to a direct current motor control circuit. The invention also relates to the use thereof in a windscreen wiper system for vehicles. An MOS FET transistor with an anti-parallel diode (M3) is serially mounted on the braking system (M2 | 09/11/2007 |
| 7268441 | Control device for motor generator In the control device for motor generator in which an engine is started and power generation is performed while a vehicle is running, a field current limit value Ifm in electric driving to start the engine is larger than a field current limit value Ifg in power gene... | 09/11/2007 |
| 7268507 | Motor controller A DC power supply, a DC motor driven by DC voltage outputted from the DC power supply, and a control unit outputting a drive control signal to drive the DC motor are provided. A motor drive switch is provided between the DC power supply and the DC motor, and a brake... | 09/11/2007 |
| 7268514 | Motor control for stopping a load and detecting mechanical brake slippage A method and apparatus for stopping an AC motor that is controlling a load while detecting mechanical brake slippage of a mechanical brake for holding the load against movement includes a controller for decreasing torque-producing current commands from the drive whi... | 09/11/2007 |
| 7262571 | Resistive braking module with thermal protection A braking module includes a braking load, an input terminal, an output terminal, and control logic. The input terminal is adapted to receive a motor drive signal. The control logic is adapted to receive a motor enable signal, couple the output terminal to the input ... | 08/28/2007 |
| 7248008 | Shaded-pole A.C. motor with dynamic brake Am improved shaded pole A.C. motor with dynamic brake that includes a secondary high resistance winding that is selectively connected to a D.C. source when the A.C. voltage is removed. To stop a motor the A.C. voltage applied to the motor is removed with tandem swit... | 07/24/2007 |
| 7242162 | Apparatus and method for retracting awning An apparatus and method for retracting an awning. A sensor detects an awning acceleration caused by wind impacting the awning, and generates a signal having an amplitude corresponding thereto. When the signal exceeds a certain threshold, the awning is retracted. The... | 07/10/2007 |
| 7235946 | Actuator current control method The present invention relates to an actuator current control method. The method of the present invention comprising the steps of measuring a feedback current passing through an actuator, determining PWM duty according to an error component between a target current p... | 06/26/2007 |
| 7227325 | Method and arrangement for protecting a frequency converter A method and an arrangement for protecting a frequency converter in a system comprising a motor and a frequency converter supplying it via a bipolar or multipolar supply connection, the arrangement comprising first connecting means adapted to couple poles of the sup... | 06/05/2007 |
