Patent application number | Description | Published |
20100315024 | INVERTER DEVICE - An inverter device includes a filter circuit, an inverter circuit, an electric current detecting circuit, a voltage detecting circuit, a control circuit for outputting a drive signal so as to switch switching devices ON and OFF and an internal power supply. The control circuit includes a shutdown circuit for stopping outputting the drive signal from the control circuit to the switching devices when an electric current flowing through a motor is an overcurrent or a voltage across the inverter circuit is an overvoltage. The shutdown circuit also stops outputting the drive signal from the control circuit to the switching devices when the voltage outputted from the internal power supply is not stabilized. When electric power by residual charge in the capacitor is used after the inverter device is disconnected from a high-voltage battery, the control circuit generates the drive signal based on a triangular reference waveform and also based on three command values for keeping switching devices corresponding to one phase of three phases in either ON or OFF state and for switching ON and OFF the other switching devices corresponding to the remaining two phases. | 12-16-2010 |
20110241585 | DIRECT-CURRENT TO THREE-PHASE ALTERNATING-CURRENT INVERTER SYSTEM - A DC to three-phase AC inverter system includes a three-phase motor, an inverter circuit, switching elements, a capacitor, a DC power source and a control circuit. The DC power source is connected to the three-phase motor at a neutral point thereof. The control circuit calculates voltage commands, first through third divided boost commands by dividing a boost command, and first through third drive signals based on the voltage commands and the first through third divided boost commands. The second and third divided boost commands are used when the PWM control is performed by turning on and off the switching elements for the second and third phases while the switching elements for the first phase continues to be on or off state is set larger than those used when the PWM control is performed by turning on and off the switching elements for the first through third phases. | 10-06-2011 |
20110241587 | DIRECT-CURRENT TO THREE-PHASE ALTERNATING-CURRENT INVERTER SYSTEM - A direct-current to three-phase alternating-current inverter system includes a three-phase motor, a plurality of switching elements, an inverter circuit for the three-phase motor, a capacitor, a direct-current power source and a control circuit. The switching elements arranged in the inverter circuit serve as upper and lower arms for the respective three phases of the three-phase motor, respectively. The capacitor is connected in parallel to the respective pairs of the upper and lower arms. The direct-current power source is arranged between the neutral-point of the three-phase motor and the respective lower arms or the respective upper arms. The control circuit controls the switching elements such that at least the switching frequency of one pair of the switching elements for one phase through which the current having the greatest value flows is lower than the switching frequencies of the other pairs of the switching elements for the other phases. | 10-06-2011 |
20120187878 | METHOD FOR DETECTING DETERIORATION OF PERMANENT MAGNET IN ELECTRIC MOTOR AND SYSTEM FOR THE METHOD - A method for detecting deterioration of a permanent magnet in an electric motor is characterized by peak current measuring steps and a determination step. In the first peak current measuring step, when the electric motor is started, a first pulsed voltage is applied to the multi-phase coils so as to generate magnetic flux directed in the same direction as generated by the permanent magnet and a first peak current is measured. In a second peak current measuring step, a second pulsed voltage is applied to the multi-phase coils so as to generate magnetic flux directed in the direction opposite to the direction in which magnetic flux is generated by the permanent magnet and a second peak current is measured. In a determination step, it is determined whether or not the permanent magnet is deteriorated based on the difference of the absolute value between the first and the second peak currents. | 07-26-2012 |
20120194111 | INVERTER UNIT - The two-phase modulation control inverter unit includes a plurality of switching devices, a shunt resistor and a controller. The switching devices drive a three-phase motor. The shunt resistor is connected between a direct-current power supply and the switching devices. The controller reads a voltage applied to the shunt resistor in a read cycle, computes command voltages based on the read voltage, and uses the command voltages and carrier signals to compute three control signals. The read cycle corresponds to two or more signal cycles of each carrier signal. Each control signal has a pulse for each signal cycle of the corresponding carrier signal. The controller integrates a plurality of pulses of each control signal in the read cycle into one or more pulses. The controller reads a voltage applied to the shunt resistor at the time of outputting of the integrated one or more pulses in the next read cycle. | 08-02-2012 |
20140076434 | MOTOR-DRIVEN COMPRESSOR FOR A VEHICLE - A first accommodation chamber accommodating therein an inverter unit with a built-in inverter circuit and a second accommodation chamber accommodating therein a filter unit with a built-in filter circuit are formed individually in different positions of a housing of a motor-driven compressor for a vehicle. The input terminals and the output terminals of the inverter unit and of the filter unit are all arranged so as to extend in the same direction. | 03-20-2014 |
20140090412 | MOTOR-DRIVEN COMPRESSOR AND AIR CONDITONER - A motor-driven compressor includes a housing assembly, a compression mechanism, an electric motor, a discharge port, an outlet, a discharge passage, discharge valve and a valve device. The compression mechanism is accommodated in the housing assembly. The electric motor drives the compression mechanism. The discharge chamber is formed in the housing assembly. The discharge port is formed in the housing assembly for communication between the discharge chamber and the compression mechanism. The outlet is formed in the housing assembly for communication with an external circuit. The discharge passage is formed in the housing assembly for communication between the discharge chamber and the outlet. The discharge valve is disposed in the discharge chamber for opening and closing the discharge port. The valve device is configured to adjust an opening of the discharge passage. | 04-03-2014 |
Patent application number | Description | Published |
20090054544 | HARD COATING COMPOSITION FOR METAL SUBSTRATE - The object of the present invention is to provide a hard coating composition for a metal substrate, including a film-forming resin component which contains a urethane(meth)acrylate obtained by reacting a polyisocyanate compound, a polyol, and a (meth)acrylate monomer having a hydroxyl group, wherein the polyisocyanate compound is hydrogenated xylylene diisocyanate and/or dicyclohexylmethane diisocyanate. | 02-26-2009 |
20100144956 | RESIN COMPOSITION FOR AQUEOUS COATING MATERIAL, METHOD FOR PRODUCING THE SAME, AND AQUEOUS COATING MATERIAL - A resin composition for an aqueous coating material that includes a propylene-butene resin component and/or propylene-ethylene-butene resin component (A), and a (meth)acrylic resin component (B), wherein the mass ratio between the propylene-butene resin component and/or propylene-ethylene-butene resin component (A) and the (meth)acrylic resin component (B) is within a range from 15:85 to 75:25. Also disclosed are a method for producing such a resin composition and an aqueous coating material. The present invention is able to provide a resin composition for an aqueous coating material that is useful as a binder within an aqueous coating material that uses no organic solvents or chlorine compounds, and yet exhibits excellent adhesion to polyolefin-based resins and is capable of forming a coating film that is resistant to discoloration and exhibits favorable resistance to the oils contained within gasoline, cosmetic products and foodstuffs and the like, and is also able to provide a method for producing the resin composition and an aqueous coating material that uses the resin composition. | 06-10-2010 |
20100203325 | COATING COMPOSITION FOR METAL THIN FILM AND PHOTOLUMINESCENT COATING FILM FORMED FROM SAME - A coating composition for a metal thin film for coating a vapor-deposited film or sputtered film provided on the surface of a base material, comprising: a coating film forming component containing 50% by weight or more of urethane (meth)acrylate that is a reaction product of hydrogenated xylene diisocyanate and/or hydrogenated diphenylmethane diisocyanate, polyol, and (meth)acrylate having a hydroxyl group. | 08-12-2010 |