Class / Patent application number | Description | Number of patent applications / Date published |
318400100 | With timing or delay | 14 |
20090051305 | ELECTRONIC COMMUTATION METHOD AND RELATED APPARATUS - A method and apparatus for electronic commutation of a pulse width modulation (PWM) controlled motor involves temporarily increasing the frequency of one or more PWM drive signals applied to the motor upon the occurrence of an asynchronous commutation event. | 02-26-2009 |
20090189552 | MOTOR DRIVE UNIT AND OPTICAL APPARATUS - A motor drive unit includes a controller configured to drive a motor to a target position by using a first driving mode in which a state of energization of coils of the motor is switched in accordance with outputs from rotor position detectors and a second driving mode in which a state of energization of the coils is switched on the basis of a predetermined time interval. The controller turns on the energization of the coils during a predetermined time under an energization condition at a completion of driving to the target position when the rotor position detectors detect that the rotor position shifts from the target position after turning off the energization of the coils according to the completion of driving to the target position. | 07-30-2009 |
20100176756 | BRUSHLESS MOTOR - To further improve the stability of drive control for the start period of a motor without complicating a circuit configuration. | 07-15-2010 |
20110254476 | CONTROL OF A BRUSHLESS MOTOR - A method of controlling a brushless motor that includes rectifying an alternating voltage to provide a rectified voltage having a ripple of at least 50%, exciting a winding of the motor with the rectified voltage, and performing a first process or a second process in response to current in the winding exceeding a threshold that is proportional to the rectified voltage. The first process includes freewheeling the winding, while the second process includes continuing to excite the winding for an overrun period and freewheeling the winding at the end of the overrun period. Additionally, a control system that implements the method, and a motor system that incorporates the control system. | 10-20-2011 |
20110279070 | MOTOR DRIVING DEVICE AND ELECTRIC EQUIPMENT USING THE SAME - Brushless DC motor ( | 11-17-2011 |
20120217907 | MOTOR DRIVING CIRCUIT - A motor driving circuit includes an inverter circuit which supplies a driving current to a coil of a single phase brushless DC motor, a position detection sensor which detects a magnetic pole position of a magnet rotor of the motor and outputs a position detection signal, and a controller which controls the inverter circuit based on the position detection signal and a speed instruction signal for instructing a rotating speed of the motor. At a time of startup of the motor, the controller makes a pulse width of a PWM signal for controlling the inverter circuit constant in a first time period which starts after the position detection signal zero-crosses and lasts until the position detection signal zero-crosses next time, and narrows the pulse width of the PWM signal as time elapses in a second time period immediately after the first time period. | 08-30-2012 |
20130009573 | LOCK PROTECTION AND STANDBY MODE CONTROL CIRCUIT OF MOTOR DRIVING APPARATUS - A motor driving apparatus including a lock protection unit, a standby mode control unit, and a motor control circuit is provided. The lock protection unit receives a motor speed signal representing the rotation of the motor and generates a lock signal accordingly. The standby mode control unit receives a PWM signal and the lock signal and generates a standby mode control signal accordingly. The lock protection unit decides whether to stop generating the lock signal or not accordingly to the standby mode control signal. The motor control circuit controls the rotation of the motor according to the PWM signal and changes the operation mode according to the standby mode control signal and the lock signal. | 01-10-2013 |
20130015792 | MOTOR DRIVING CIRCUIT AND MOTOR DEVICEAANM Sekihara; ToshikazuAACI Kawasaki-shiAACO JPAAGP Sekihara; Toshikazu Kawasaki-shi JP - A motor driving circuit has a driving controlling signal generating circuit that controls a driver with a driving controlling signal, the driver supplying a driving voltage that drives the motor to the motor. The motor driving circuit has a mode selecting circuit that detects a power supply voltage supplied from a power supply to the driver, outputs a normal operation mode signal indicative of a normal operation to the driving controlling signal generating circuit if the power supply voltage is equal to or higher than a preset first threshold, and outputs a test operation mode signal indicative of a test operation to the driving controlling signal generating circuit if the power supply voltage is lower than the first threshold. | 01-17-2013 |
20130088178 | METHOD FOR DRIVING AN ELECTRIC MOTOR - A circuit configuration for driving an electric motor includes a signal evaluation module, which stores a number of output patterns. An input pattern is specified, and as a function of the input pattern, one of the output patterns is output, by which the electric motor is driven. | 04-11-2013 |
20130187577 | AIRCRAFT MOTOR DRIVE CONTROL APPARATUS - An inverter and a control unit that has a command signal processing unit and a PWM frequency control unit and performs pulse width modulation control are provided. If the command signal processing unit has received a first PWM frequency command signal, it outputs a low PWM frequency command signal so that synchronous or asynchronous PWM control is performed at a PWM frequency in a predetermined frequency range. The command signal processing unit outputs a high PWM frequency command signal so that synchronous or asynchronous PWM control is performed at a higher frequency than the above-mentioned frequency if the command signal processing unit has received a second PWM frequency command signal and until a predetermined time period elapses. The command signal processing unit outputs a low PWM frequency command signal if it has received the second PWM frequency command signal and after the predetermined time period elapsed. | 07-25-2013 |
20130193882 | METHOD FOR CONTROLLING INVERTER - A method for controlling an inverter in a system including a load, a motor for driving the load, and an inverter for operating the motor comprises when a load amount of the load is reduced to below a sleep level, checking whether a time corresponding to a sleep delay has lapsed; when the load amount of the load is still below the sleep level even after the sleep delay, varying an operating frequency of the motor, and if there is no change in a feedback from the load in response to the variation in the operating frequency, controlling the inverter to enter a sleep mode. | 08-01-2013 |
20140139153 | DRIVING CONTROL DEVICE OF MOTOR - A driving control device of a motor includes: a motor driving unit, which drives a motor in response to a driving control signal; and a control unit, which determines an energization pattern applied to an armature coil based on a detected rotational position of the rotor, wherein the control unit starts rotation control by a preset first energization pattern when activating of the motor, wherein when a predetermined time period has elapsed, the control unit adjusts energizing timing to be a timing, at which a short of each phase is not caused at switching of the energization pattern, and then outputs the driving control signal to the motor driving unit so that the rotation control is switched to rotation control of a second energization pattern, which has a predetermined advanced angle amount with respect to the first energization pattern. | 05-22-2014 |
20150028780 | AIR CONDITIONER - An air conditioner includes: an outdoor fan provided in an outdoor unit; a permanent magnet synchronous motor that drives the outdoor fan; an inverter that uses a DC power source as a power source and applies a voltage to the permanent magnet synchronous motor; an inverter control means that controls the output voltage of the inverter; and a shunt resist connected between the DC power source and the inverter. If the outdoor fan is rotating due to an external force while the inverter is stopped, the inverter control means causes the inverter to operate using a brake sequence that brakes the rotation of the outdoor fan, and then causes the inverter to operate using a drive sequence that power-drives the outdoor fan. | 01-29-2015 |
20160036359 | INVERTER APPARATUS - An inverter apparatus includes an inverter circuit, a capacitor, and a control unit. In the first control mode, the control unit shifts a phase of at least one of PWM signals of three phases such that a time period during which polarities of output voltages of three phases are the same is shorter in the first control mode than the time period in the second control mode; and controls the inverter circuit so as to supply a direct current to the three-phase AC motor as a d-axis current by outputting the PWM signals of three phases, each having a phase after the phase shift processing. In the second control mode, the control unit controls the inverter circuit so as to supply an alternating current to the three-phase AC motor by outputting the PWM signals of three phases, each having a phase before the phase shift processing. | 02-04-2016 |