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WO/1981/003586A1 |
A motor voltage control device for single-phase and for three-phase motors, for controlling the voltage supplied to the motor to thereby decrease power when the motor is less than fully loaded. The single-phase device (10) includes a sof...
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WO/1981/000651A1 |
Induction motors traditionally have a high breakaway torque to running torque ratio to prevent motor damage from excessive current as the motor slows down under a heavy load. Such design characteristic results in motor flux density being...
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WO/1980/002487A1 |
Voltage-to-frequency-converter, in response to primary variable analog input signal (Vc), generates one or more trains (C; F) of output pulses. For each train, its frequency vs. primary input signal characteristic is in three ranges or m...
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JP7473121B2 |
To suppress a decrease in torque in a specific rotation speed range and completes the start quickly.In a first rotation speed range of a single-phase induction motor, a control circuit makes main winding continuously conductive and shift...
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JP2024034180A |
[Problem] Gas compressor capable of switching an electric motor from star connection to delta connection at the time of startup at an appropriate timing even when the conditions that change the starting torque of the gas compressor, such...
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JP7433947B2 |
A method for operating a drive train, having a main and, an auxiliary drive and a speed modulation gearbox with a fixed mechanical transmission ratio between the two drives, for starting and towing a drive train to a defined set rotation...
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JP7403668B2 |
According to an embodiment, an electric motor drive device includes an electric motor, a main circuit, a current sensor, and a control unit. The electric motor has a plurality of windings. The main circuit transforms power of an alternat...
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JP7398879B2 |
A motor control apparatus configured to control a motor, includes: a drive circuit of the motor including a semiconductor device and being installed on a different substrate from a substrate of the motor; a load switching unit configured...
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JP2023158377A |
To obtain the energy-saving effect even when the starting current (torque) and start time vary due to variation in a temperature of hydraulic oil and a motor load following a secular change of a hydraulic component such as a hydraulic pu...
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JP7347710B2 |
If the temperature of an electric motor (44) is lower than a prescribed temperature at startup of an internal combustion engine (1), warm-up control of the electric motor (44) is carried out to raise the temperature of the electric motor...
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JP2023109005A |
To provide a motor control technique to prevent a failure in starting a motor.A motor control unit comprises a motor that drives a load, and control means that controls the motor. When staring the motor, the control means determines if a...
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JP7272358B2 |
The purpose of the present invention is to provide an electric cylinder system that initiates operation when a brake is definitely released. An electric cylinder system (100) comprises: an electric cylinder (10) that comprises a cylinder...
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JP7247722B2 |
To provide a motor system capable of reducing a facility load by suppressing a starting current low, and capable of being exchanged in a short period when the motor system is in failure.A driving source 4 making a load device 2 operate w...
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JP7244146B1 |
An object of the present invention is to provide an economically effective spray gun capable of reliably restarting even when the spray machine is restarted with a sprayed material in the tank. A chain (30) is connected to an upper shaft...
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JP7231199B2 |
The invention relates to a method for cranking an internal combustion engine, including the steps of: (a) receiving a start signal; (b) determining an initial position of the rotor with respect to a stator phase winding; (c) applying a p...
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JP7191304B2 |
To provide a starter that improves the power factor of an induction motor by an inverter and finally connects the induction motor directly to a power supply.When starting an induction motor, it starts at a low frequency with a three-phas...
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JP7185480B2 |
The present disclosure provides a power conversion apparatus converting a power from a DC power source, supplying the converted power to a rotary electric machine to drive the rotary electric machine. The power conversion apparatus accor...
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JP2022546285A |
The present invention relates to a method for starting a sensorless single-phase electric motor (10), the electric motor (10) comprising a permanent magnet motor rotor (24), an electromagnetic motor stator (12) having stator coils (16), ...
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JP7162839B2 |
To provide a single-phase induction motor that does not require adjustment works for obtaining a large starting torque.A control circuit controls a single-phase induction motor to alternately repeat an acceleration interval for increasin...
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JP7160011B2 |
To provide an induction motor initiation system which can reduce a starting current.The total capacity of a first induction motor M1 and a second induction motor M2 is the same as the load capacity of a pump 2. The capacity of the first ...
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JP2022159891A |
To provide an electric motor starting system capable of reconciling multiple start-up frequency and miniaturization of an electric motor with a small-capacity inverter device.After an input switch and an output switch are closed, the num...
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JP7132584B2 |
To reduce wasteful power consumption when operating an AC motor such as a three-phase squirrel-cage induction motor or a three-phase synchronous motor and to suppress an adverse effect on the AC motor when starting.When a signal 35 from ...
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JP7108834B2 |
A power generation device comprising: an electric motor (18) that has a first object, a second object, permanent magnets, and windings (15, 16, 17), and that generates an electromotive force in the windings by relative motion between the...
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JP7081654B1 |
To provide a control method and a control device for an electric motor of an escalator which surely suppresses a starting current at the start of Δ operation in Y-Δ control of an electric motor for traveling a step of the escalator. In...
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JP7012013B2 |
A PM line-start motor, preferably motors having a power of at least 5 kW, and a switch-on method therefor are provided. The motor includes a rotor and a stator having a stator winding designed as a pole-reversible rotary field winding. W...
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JP6994698B2 |
To realize a single-phase induction motor having a large starting torque, and good steady operation efficiency.A single-phase induction motor includes a main winding, an auxiliary winding connected in parallel with the main winding, a ca...
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JPWO2020202469A1 |
The motor control device includes a power conversion device that supplies a voltage to a plurality of motors connected in parallel to each other, and a plurality of relays that are provided corresponding to the plurality of motors and th...
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JP6949082B2 |
Unique systems, methods, techniques and apparatuses of motor starters are disclosed. One exemplary embodiment is a synchronous machine including a plurality of stator phase windings, a rotor, a motor starter, and a controller. The motor ...
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JP6943642B2 |
To provide a washing machine in which, even when a signal output from a rotation position sensor cannot be appropriately obtained, a motor can be restarted while the occurrence of overcurrent is prevented.A washing machine according to a...
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JP6924048B2 |
A device, system and method for starting a single-phase induction motor comprising the steps of: i) energizing the start winding (50b) and continuously estimating an operating rotation (R 1 ) of the single-phase induction motor throughou...
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JP6925513B2 |
Prior to starting of first and second synchronous motors, direct-current excitation is performed to pull in rotors of the synchronous motors to a designated position. In the direct-current excitation, a difference between a value of a di...
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JP6908236B2 |
A capacitor-start single-phase induction motor which can obtain a large startup torque is provided. The single-phase induction motor includes a main coil, an auxiliary coil connected in parallel with the main coil, a capacitor connected ...
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JP6882917B2 |
To provide a starter capable of starting a pump device without generating no torque shortage even when load of the pump device is heavy.A starter 10 for starting a pump device includes: an output detector 17 for detecting output informat...
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JP2021069250A |
To provide a drive control unit, a sheet processing apparatus, and a load starting method that can reduce a current flowing in a power supply at the start-up of a load.An image forming apparatus comprises: a first drive circuit 641 that ...
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JP6851495B2 |
An electric motor control device controls driving of electric motors connected in parallel with each other and includes a power converter converting power from a power supply, and supply the converted power to each of the electric motors...
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JP6844290B2 |
An inverter device converts DC to AC and supplies power to a load (motor), and includes a temperature sensor that directly or indirectly detects a temperature of the inverter device; a DC link including a smoothing capacitor; an inverter...
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JP6838452B2 |
To provide a driving device having both an excellent acceleration performance of a driving shaft and a reduced power consumption.A driving device 200 has a first power transmission portion 230 transmitting power of a stepping motor 210 t...
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JP2021023047A |
To start a motor by a multi-stage kondorfer starting method without generating a short-circuit current.A starting device that starts a motor by a kondorfer starting method includes: a single-winding transformer with a plurality of taps; ...
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JP6806105B2 |
To provide an electric motor starting device improved in such a manner that an inverter capacity of a power conversion device to be used for starting an electric motor can be reduced.When starting of an electric motor 14 is started, a co...
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JP6792075B2 |
A thyristor starter (100) is configured to accelerate a synchronous machine (20) from a stop state to a predetermined rotation speed by sequentially performing a first mode of performing commutation of an inverter (2) by intermittently s...
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JP6781343B2 |
A thyristor starter (100) accelerates a synchronous machine (20) from a stop state to a predetermined rotation speed by sequentially performing a first mode of performing commutation of an inverter (2) by intermittently setting DC output...
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JP6710339B2 |
The present invention has a control device (100) that is capable of switching windings between a star connection and a delta connection. The control device (100) controls an inverter (30) that applies a frequency- and voltage-variable al...
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JP6704523B2 |
A thyristor starter (100) is configured to accelerate a synchronous machine (20) from a stop state to a predetermined rotation speed by sequentially performing a first mode of performing commutation of an inverter (2) by intermittently s...
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JP6697678B2 |
To provide a control apparatus of an induction motor, capable of estimating a rotational speed of a free-run state at a high precisely.A control apparatus of an induction motor, comprises: an inverter 20; a current detection means 40; a ...
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JP6695246B2 |
To provide a field winding-type synchronous electric machine with high reliability, which allow a magnetic field to be supplied even when an input signal is eliminated.A field winding-type synchronous electric machine comprises: an excit...
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JP6697129B2 |
A thyristor starter (100) accelerates a synchronous machine (20) from a stop state to a predetermined rotation speed by sequentially performing a first mode of performing commutation of an inverter (2) by intermittently setting DC output...
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JP6695250B2 |
To provide a field-winding type synchronous electric motor in which a field can be reliably applied in an appropriate phase according to the electric motor characteristics.A field-winding type synchronous electric motor includes an excit...
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JP6692170B2 |
To provide a fluid compression device that can suppress noise caused by a rapid change of rotational frequency of a motor while supplying fluid having stable pressure.A fluid compression device includes: a compressor body for compressing...
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JP2020061815A |
To provide a motor drive control device capable of reducing power consumption at the time of startup operation, a motor employing the same, and a blower.A motor drive control device comprises: a drive control unit which generates a rotat...
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JP2020058200A |
To provide a motor drive control device and a motor drive control method that can start up quickly while suppressing heat generation of a motor.A motor drive control device 1 according to an embodiment includes a motor drive unit 2 that ...
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