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公开(公告)号：US10944350B2
公开(公告)日：2021-03-09
申请号：US16612474
申请日：2017-07-26
发明人： Keiichiro Shizu , Yosuke Shinomoto
摘要： A motor drive device capable of switching the connection configuration of the stator windings of a motor includes three relays each including a first contact, a second contact, and a contact plate, where the contact plate has one terminal coupled to a stator winding of one phase among the stator windings and the contact plate has another terminal to be connected to the first contact or to the second contact; and a control unit to control the three relays to cause all the three relays to have a same connection state in a case in which not all the three relays have a same connection state with respect to connections between the another terminal of the contact plate and the first contact and the second contact.
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公开(公告)号：US11431271B2
公开(公告)日：2022-08-30
申请号：US16631229
申请日：2017-10-24
摘要： An electric motor drive device includes: a wire connection switching unit; an inverter; a control device controlling the wire connection switching unit and the inverter; and an overcurrent protection circuit preventing current exceeding a predetermined value from continuously flowing through the electric motor. The overcurrent protection circuit includes: determination circuits each correlated one-to-one with any one of possible wire connection states of a stator winding and determining whether current flowing through the inverter is abnormal; a combining circuit combining determination results; and an invalidation circuit invalidating a determination process by one or more of the determination circuits, and causing the combining circuit to output a determination result by the determination circuit correlated with a selected wire connection state of the stator winding. When the determination result output from the combining circuit indicates an abnormal value of the current flowing through the inverter, the control device stops the inverter.
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公开(公告)号：US10126033B2
公开(公告)日：2018-11-13
申请号：US15030397
申请日：2015-01-13
发明人： Yasushi Makino , Keiichiro Shizu , Kenta Owada
摘要： A power conversion device includes a first AC-DC conversion section generating DC voltage applied to a compressor drive section, a first DC-voltage smoothing section smoothing DC voltage, a first noise reduction section having one end connected to an AC power source and the other end connected to the first AC-DC conversion section, a second noise reduction section disposed between the first noise reduction section and the first AC-DC conversion section, an inrush-current inhibition circuit (a first inrush-current inhibition resistor and a rectifier diode) connected in parallel with the second noise reduction section and the first AC-DC conversion section for inhibiting inrush current from flowing to the first DC-voltage smoothing section, a first AC power-source relay opening/closing a power supply path to the inrush-current inhibition circuit, and a second AC power-source relay opening/closing a power supply path to the second noise reduction section.
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公开(公告)号：US11031896B2
公开(公告)日：2021-06-08
申请号：US16613150
申请日：2017-07-31
IPC分类号： H02P25/18 , H02P29/024
摘要： An electric quantity of a power supply of a connection switching device for switching the connection state of a motor, or at least one electric quantity which varies with the first-mentioned electric quantity is detected, the result of the detection is used to detect or predict a fall of a voltage of the switching power supply. Based on the result of the detection or prediction, an inverter is so controlled as to stop the motor before the voltage of the switching power supply falls below the minimum voltage required for the operation of the connection switching device. Breakdown of the connection switching device can be prevented.
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公开(公告)号：US10063133B2
公开(公告)日：2018-08-28
申请号：US15550506
申请日：2015-03-31
CPC分类号： H02M1/32 , F24F11/89 , H02M1/42 , H02M1/4225 , H02M1/44 , H02M3/155 , H02M5/44 , H02M7/12 , H02M2001/0006 , H02P27/06 , Y02B70/126
摘要： A power supply device includes a first rectifying unit that converts the AC power passed through an input unit into DC power, a power-factor improving unit that improves a power factor of the DC power output from the first rectifying unit, a first power storage unit that stores the DC power passed through the power-factor improving unit and supplies the stored DC power to a load side, a second rectifying unit connected to a portion where the input unit is connected to the AC power supply, the second rectifying unit converting the AC power into the DC power, a second power storage unit that stores the DC power passed through the second rectifying unit, and a control unit that operates using the electric power stored in the second power storage unit and, when a short-circuit failure occurs in the power-factor improving unit, performs control for interrupting the input unit.
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公开(公告)号：US11177756B2
公开(公告)日：2021-11-16
申请号：US16955266
申请日：2018-03-08
发明人： Shun Miyamori , Shinichiro Ura , Keiichiro Shizu
IPC分类号： H02P25/18 , H02P27/06 , H02P29/032 , H02P29/024
摘要： An electric motor drive device includes a wire-connected-state switching unit to switch a wire connected state of stator windings of an electric motor to either a delta connected state or a star connected state, an inverter to drive the electric motor, and a relay-voltage detection circuit to detect a relay voltage (VR) that is a power-supply voltage of the wire-connected-state switching unit, and to deactivate the inverter when the relay voltage (VR) is decreased below a threshold.
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公开(公告)号：US11070157B2
公开(公告)日：2021-07-20
申请号：US16607758
申请日：2017-07-21
摘要： An electric motor drive unit includes a winding switching unit that switches a configuration of windings of an electric motor, a winding switching instruction unit that generates an instruction signal for the winding switching unit, and a winding configuration retention unit to which the instruction signal generated by the winding switching instruction unit is input, and if the input instruction signal has a first value, outputs a signal corresponding to the input instruction signal to the winding switching unit, and if the input instruction signal has a second value different from the first value, continues outputting a signal that has been output to the winding switching unit before the reception of the second value, the first value indicating an instruction on the configuration of the windings.
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公开(公告)号：US11031895B2
公开(公告)日：2021-06-08
申请号：US16604857
申请日：2017-07-07
IPC分类号： H02P25/18 , F25B49/02 , H02M7/5387 , H02P27/08 , H02P29/00
摘要： A motor drive system can detect a misconnection. A motor drive system for driving a motor including a plurality of stator windings includes: an inverter that converts a DC voltage supplied from a DC voltage source into an AC voltage and applies the AC voltage to the motor; a connection switching device that is disposed between the inverter and the motor and can switch a connection state of the stator windings; and a controller that performs abnormality determination on a connection state of the connection switching device on the basis of a current value of a current flowing in each of the stator windings.
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