| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 318459000 | Terminal voltage or counter-electromotive force of controlled motor | 7 |
| 20080258663 | Brushed motor controller using back EMF for motor speed sensing, overload detection and pump shutdown, for bilge and other suitable pumps - A method and apparatus are provided for providing one or more brushed motor control signals for controlling the operation of a brushed motor, including a signal for disconnecting the power applied to the brushed motor so that the brushed motor can provide a brushed motor signal containing information about a collective back EMF from all poles of the brushed motor; and responding to the brushed motor signal, measuring the collective back EMF of the brushed motor, and providing the one or more brushed motor control signals for controlling the operation of the brushed motor. | 10-23-2008 |
| 20090079377 | SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE - In a semiconductor integrated circuit device of the invention, a plurality of external terminals include: a first external terminal (VCC, U, V and W terminals in the FIGURE) receiving a higher voltage than the other external terminals; and a second external terminal (FG terminal in the FIGURE) arranged adjacent to the first external terminal as one of the other external terminals, the second external terminal feeding out, from one end of a transistor Q | 03-26-2009 |
| 20100253271 | POWER LIMITING SYSTEM FOR MULTIPLE ELECTRIC MOTORS - A power limiting system for multiple electric motors includes an electrical power generating component, such as an alternator, and a plurality of motor controllers connected to an electrical bus. Each motor controller compares the voltage on the bus to a specified minimum voltage and a specified maximum voltage, and reduces its electric power output if the voltage on the bus is less than the maximum voltage while continuing to operate the electric motors. | 10-07-2010 |
| 20120249037 | MOTOR DRIVING DEVICE - In a motor driving device, a driving switching element is connected in series with a motor between a power source and a ground, and operated by a PWM signal outputted from a control circuit. A return current path forming unit is connected in parallel with the motor to allow a return current when the driving switching element is turned off. A series circuit of a current flow restriction element and a switch is connected in parallel with the return current path forming unit. A disconnection determination unit prohibits output of the PWM signal and closes the switch of the series circuit when a voltage applied to the motor does not fluctuate according to the PWM signal, and determines the disconnection of the motor on condition that the voltage detected in that state indicates a change across a second threshold. | 10-04-2012 |
| 20130057188 | APPARATUS FOR CONTROLLING BOOST CONVERTER - An apparatus for controlling a boost converter is provided with: an operating device provided with a proportional element, an integral element and a derivative element, the derivative element being configured as a bandpass filter, the operating device calculating a PID controlled variable corresponding to an electric current command value of the boost converter; a controlling device for controlling the output voltage of the boost converter on the basis of the calculated PID controlled variable; a judging device for judging whether or not loss suppression on the direct current power supply is to be prioritized; and a switching device for switching an operation mode of the operating device from a variation suppression mode to a loss suppression mode if it is judged that the loss suppression is to be prioritized. In the loss suppression mode, a cutoff frequency of the bandpass filter is corrected to a lower frequency side at a lower rotational speed of the three-phase alternating current motor. | 03-07-2013 |
| 20140239866 | MOTOR DRIVING DEVICE - A motor driving device, which controls a rotation number of a brushed motor by outputting a command signal to a motor controller placed in a current supply path, includes: a noise detecting unit including at least one of: a high voltage side noise detecting unit which detects high voltage side noise from brush noise included in the monitor voltage, based on whether a monitor voltage is larger than a first threshold voltage; and a low voltage side noise detecting unit which detects low voltage side noise from the brush noise included in the monitor voltage, based on whether the monitor voltage is smaller than a second threshold voltage; and a calculating unit which outputs the command signal to the motor controller to control the rotation number of the motor to reduce a occurrence number of the brush noise, based on at least one of the occurrence numbers. | 08-28-2014 |
| 20150097503 | IMAGE FORMING APPARATUS, MOTOR CONTROL APPARATUS, AND METHOD OF CONTROLLING MOTOR - An image forming apparatus includes an engine portion configured to perform image forming, a direct current (DC) motor configured to mechanically operate the engine portion, a driver including a resistor to measure current that flows to the DC motor according to the measured current and configured to provide a predetermined voltage to the DC motor, and a drive controller configured to measure a driving speed of the DC motor based on a voltage value of the resistor and to control the driver to provide a voltage that corresponds to the measured driving speed to the driver. | 04-09-2015 |
