| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 318400010 |
Brushless motor closed-loop control
| 2327 |
| 318720000 |
Armature winding circuits
| 106 |
| 318716000 |
Field winding circuits
| 38 |
| 318701000 |
Hysteresis or reluctance motor systems
| 37 |
| 318400420 |
Brushless motor open-loop control
| 29 |
| 318705000 |
Synchronization systems
| 14 |
| 318702000 |
Antihunting or damping
| 10 |
| 318703000 |
Braking | 4 |
| 20090026998 | ON-VEHICLE ACTUATOR SYSTEM - A motor is controlled to always consume power supplied from a power supply system or not to supply power to the power supply system, by performing control to advance or delay a phase of a 3-phase current flowing in the motor or to reduce a percentage of the generated torque with respect to an effective value of the 3-phase current of the motor, or by applying a d-axis current to the motor. | 01-29-2009 |
| 20150042259 | EMERGENCY STOP METHOD FOR HYBRID CONSTRUCTION EQUIPMENT AND BRAKE CONTROL DEVICE - The present disclosure relates to an emergency stop method for hybrid construction equipment and a brake control device, and more particularly, to an emergency stop method for hybrid construction equipment and a brake control device, which may confirm a failure occurrence location of the hybrid construction equipment, absorb inertial energy of the swing body using several functions for each generated failure location so as to stably stop the swing body in an emergency manner, and when the failure occurs in the hybrid construction equipment, create the brake pattern by using the swing speed or the front information, control a brake of the swing body by controlling a voltage control valve or a hydraulic valve in accordance with the created brake pattern, such that a user may smoothly stop the swing body in accordance with a desired stop speed profile. | 02-12-2015 |
| 20150326151 | MOTOR CONTROL DEVICE - Provided is a motor control device that includes an inverter circuit that includes a plurality of P-side switching elements and a plurality of N-side switching elements and drives a motor via a plurality of motor terminals; a first dynamic brake that brakes the motor by turning on all the phases of the plurality of P-side switching elements or turning on all the phases of the plurality of N-side switching elements; a second dynamic brake that brakes the motor by connecting dynamic brake resistors between the motor terminals; and a control unit that switches, according to the motor speed, between the first dynamic brake and the second dynamic brake, which are the dynamic brakes that brake the motor. | 11-12-2015 |
| 20160036358 | CONSTRUCTION MACHINE - A construction machine includes: a swing structure; an electric motor that drives the swing structure; an operating device that outputs an operating signal according to an operating amount and an operating direction; an inverter device that controls the electric motor based on a control signal generated based on the operating signal; a position sensor that detects an actual speed of the electric motor; and a second controller that determines whether at least one of a first condition and a second condition is satisfied. The first condition is satisfied when a sign of a value computed by subtracting the actual speed from a target speed of the electric motor that defined by the control signal; and the second condition is satisfied when a difference between the target speed and the actual speed is greater than a first reference value, and when the acceleration is greater than a second reference value. | 02-04-2016 |
| Entries |
| Document | Title | Date |
|---|
| 20080284367 | Power Converter - A power converter is provided with a rectifying circuit, an inverter circuit, and a common mode filter including a common mode choke coil and a capacitor. The switching frequency of a PWM rectifying circuit is set at three times the switching frequency of a PWM inverter. Alternatively, the resonance frequency of the common mode filter is set at twice the carrier frequency of the rectifying circuit or the PWM inverter circuit or more. | 11-20-2008 |
| 20080315822 | Rotor position detection at standstill and low speeds using a low power permanent magnet machine - For a multiphase alternating current (AC) wound field synchronous machine (WFSM) that has a stator with a selected number of poles, the WFSM having an associated exciter and multiphase AC permanent magnet machine (PMM) directly coupled to the WFSM, a method of sensing the position of a rotor in the WFSM comprises the steps of: configuring a stator for the PMM to have a number of poles that is a sub-multiple of the selected number of WFSM stator poles; configuring a rotor for the PMM to have high saliency; applying multiphase AC power of a selected frequency to the PMM stator: detecting at least one set of stator harmonic currents of the multiphase AC power resulting from the rotor saliency; converting the detected PMM harmonic stator currents from their multiphase coordinates to αβ coordinates; rotating the converted PMM stator currents into a reference frame for at least one selected harmonic to generate αβ coordinate harmonic current vectors; and estimating the position of the WFSM rotor based on the values of the αβ coordinate harmonic current vectors in the selected harmonic reference frame. | 12-25-2008 |
| 20090091289 | STATOR INTER-TURN FAULT DETECTION OF SYNCHRONOUS MACHINES - A fault detection system using field current and rotor search coil voltage harmonics is provided. The technology is capable of detecting an inter-turn fault unambiguously and rapidly in a synchronous machine. The internal asymmetry of the machine that has adversely affected the earlier fault diagnosis results has, for the first time, been shown as an advantage. | 04-09-2009 |
| 20090153094 | DRIVE - The invention relates to a drive for simmering apparatus comprising an electric motor and a power converter arrangement which arrangement includes a rectifier unit, an intermediate circuit unit, an inverter unit and an electronic control unit wherein the inverter unit, the electronic control unit and the electric motor are combined into one common module that is arranged separate from a power input module comprising g the rectifier unit and the intermediate circuit. | 06-18-2009 |
| 20110260670 | ELECTRIC MOTOR ASSEMBLY, METHOD FOR OPERATING AN ELECTRIC MOTOR, AND MOTOR CONTROL DEVICE - The invention relates to an electric motor assembly, particularly for driving a fan for an engine cooling system and/or an air conditioner of a motor vehicle, comprising an electric motor and a motor control device for activating the electric motor. According to the invention, the motor control device can be adjusted according to a characteristic curve ( | 10-27-2011 |
| 20120068659 | WASHING MACHINE - Disclosed is a washing machine comprising a permanent magnet motor that includes a rotor and that drives rotation for execution of a wash operation; a permanent magnet that is provided on the rotor side and that has a level of coercivity allowing variation in an amount of magnetism with ease, and a magnetism controller that produces an excitation current to vary the amount of magnetism of the permanent magnet; wherein the magnetism controller, when interrupting or stopping an ongoing operation, interrupts or stops the ongoing operation after magnetizing the permanent magnet. | 03-22-2012 |
| 20140055077 | ELECTRIC MOTOR AND MOTOR CONTROLLER - An electric motor controller having a front face and a rear face, the front face carrying a plurality of AC output couplings and the controller carrying a converter configured to convert a received DC supply into an output AC supply for controlling an electric motor, the AC output couplings being disposed symmetrically about an axis of symmetry of the controller on the front face of the controller. Also described is an apparatus comprising: a DC series motor; and a first current supply configured to supply a first current to an armature of the DC series motor; a second current supply configured to supply a second current to a field winding of the DC series motor; and a controller configured to control the first current supply to supply the first current based on a required torque output for the motor, and to control the second current supply to supply the second current based on the first current. | 02-27-2014 |
