JP6467358B2 - Non-contact power feeding device and elevator - Google Patents

Description

  The present invention relates to a non-contact power feeding device and an elevator having a function of detecting a distance between a power transmission side coil and a power reception side coil.

  Along with the super-high rise of the building, it is necessary to lengthen the elevator installed in the building. In general elevators, power is supplied to equipment in a car by a power supply line called a tail cord that is suspended from the car. As the length of the elevator becomes longer, the tail cord also becomes longer, so that the mass of the tail cord increases, and there is a concern that if the length exceeds a certain length, it cannot withstand its own weight. For this reason, in an elevator with a very long stroke, a configuration without a tail cord is desired, but power feeding to in-car equipment becomes a problem.

  As a method for supplying power to in-car equipment, there is a technique disclosed in Patent Document 1. In Patent Document 1, when the elevator car is stationary on the floor, the charger-side feed-electron and the car-side mobile-side received electron are opposed to each other, and power is supplied by magnetic coupling to store power in the battery. It is disclosed that the stored electric power is supplied into the moving body.

International Publication No. 2002/098779

  However, when power is supplied while the car is stopped at the power supply floor, the stop time is shortened and the power supply time is shortened as the elevator operating rate increases. Therefore, there is a risk that the necessary power supply time cannot be secured.

  In view of the above, an object of the present invention is to ensure a long power feeding time when feeding power to a coil unit installed in a moving body such as a car.

In the contactless power supply device of one embodiment of the present invention, either the first coil or the second coil is installed in a moving body that moves in parallel with the radial direction of the winding of the first coil and the second coil. The contactless power supply device in which the relative positional relationship between the first coil and the second coil changes. The non-contact power supply device includes a conductor plate, a high-frequency signal output unit, a detection unit, and a control unit.
The conductor plate is disposed on a surface opposite to the surface facing the second coil in the first coil, and the second coil before the first coil and the second coil face each other when the moving body moves. It is formed so as to face each other.
The high frequency signal output unit supplies a high frequency signal to the second coil.
A detection part detects the electric current which flows into a 2nd coil, when a high frequency signal is supplied.
The control unit determines the current value of the second coil detected by the detection unit and the distance of the second coil relative to the conductor plate before the first coil and the second coil face each other when the moving body moves. Based on the set reference current value, a first distance that is the distance of the second coil to the conductor plate is estimated, and a second distance that is the distance between the first coil and the second coil is calculated based on the first distance. To do.

  The elevator of 1 aspect of this invention is provided with the said non-contact electric power feeder.

According to one aspect of the present invention, it is possible to detect the distance between the first coil and the second coil before the first coil and the second coil face each other when the moving body moves. Therefore, before the first coil and the second coil face each other, the information on the distance between the first coil and the second coil can be used for control on the power transmission side. Thereby, compared with the non-contact electric power feeding method which controls after the 1st coil and the 2nd coil have faced, electric power feeding time can be ensured long.
Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is a schematic block diagram of the non-contact electric power feeder which concerns on the 1st Embodiment of this invention. It is explanatory drawing of the relative position of the coil unit in the non-contact electric power feeder which concerns on the 1st Embodiment of this invention. It is a graph which shows the example of a relationship between the relative position of the coil of a receiving side, and coil current. It is a schematic block diagram of the elevator which concerns on the 2nd Embodiment of this invention. It is explanatory drawing of the coil unit of the power transmission side and power receiving side before the electric power feeding which concerns on the 2nd Embodiment of this invention. It is a sequence diagram which shows the process until the electric power feeding start in the elevator which concerns on the 2nd Embodiment of this invention. It is explanatory drawing of the coil unit by the side of the power transmission at the time of the electric power feeding which concerns on the 2nd Embodiment of this invention, and a receiving side. It is a sequence diagram which shows the process from the electric power feeding start to the completion | finish of electric power feeding in the elevator which concerns on the 2nd Embodiment of this invention. It is a schematic block diagram of the elevator which concerns on the 3rd Embodiment of this invention. It is a figure which shows the example of the shape of the metal plate installed in each floor which concerns on the 3rd Embodiment of this invention. It is a graph which shows the example of a relationship between the relative position of the coil of the receiving side at the time of using another metal plate, and coil current. It is a perspective view which shows the other example of a metal plate. It is a side view which shows the other example of a metal plate. It is a schematic block diagram of the elevator which concerns on the 4th Embodiment of this invention. It is a perspective view which shows the example of the metal plate which has a through-hole part.

  Hereinafter, an example of an embodiment for carrying out the present invention will be described with reference to the accompanying drawings. In addition, in each figure, about the component which has the substantially same function or structure, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

<1. First Embodiment>
FIG. 1 is a schematic configuration diagram of a non-contact power feeding device according to a first embodiment of the present invention. A non-contact power feeding device will be described with reference to FIG.

  A non-contact power supply apparatus 100 shown in FIG. 1 includes a coil unit 1 and a metal plate 171 that receive power for non-contact power supply. The coil unit 1 is configured to be movable. In FIG. 1, the moving direction of the coil unit 1 is orthogonal to the first direction (y direction), the direction orthogonal to the first direction is orthogonal to the second direction (x direction), the first direction, and the second direction. The direction is the third direction (z direction).

  The coil unit 1 includes a high-frequency signal output unit 10, a detection unit 20, a control unit 30, a storage unit 35, a coil 50, a magnetic body 60, and a shield plate 70.

  The coil 50 is a non-contact power feeding receiving coil formed by winding a winding a plurality of times in a spiral shape or a spiral shape. The winding is preferably a good conductor such as copper. In FIG. 1, the coil 50 has a planar shape parallel to the yx plane. The winding diameters of the coil 50 in the x direction and the y direction may be the same or different.

  The magnetic body 60 is a plate-like magnetic body made of ferrite or the like. The magnetic body 60 is disposed on the back side of the coil 50 (the surface opposite to the surface facing the metal plate 171 of the coil 50) so as to be parallel to the coil 50.

  The shield plate 70 is a shield plate that shields the leakage component (leakage magnetic field) of the magnetic field generated in the coil 50 and reduces the magnetic flux from the coil 50, and is made of a conductor such as a metal plate. The shield plate 70 is disposed on the back side of the magnetic body 60 (the surface opposite to the surface on which the coil 50 of the magnetic body 60 is disposed) so as to be parallel to the magnetic body 60.

  The metal plate 171 is supported by an arbitrary support so as to face the coil 50 of the coil unit 1 that has arrived at a power supply assumed position (position P1) described later. The assumed power supply position is a position where power can be efficiently supplied when it is assumed that there is a power transmission coil facing the coil 50. The metal plate 171 is an example of a conductor plate. As the conductor, graphite, a conductive polymer material, or the like can be used in addition to the metal. The metal plate 171 is rectangular when viewed from the coil 50 (z direction).

  The coil 50 is installed on a moving body that moves in parallel (y direction) to the radial direction of the winding of the winding of the metal plate 171 and the coil 50. As the moving body moves, the relative positional relationship between the metal plate 171 and the coil 50 changes.

  The position P0 represents the position of the central axis of the coil 50 in the coil unit 1 in the y direction. The position P1 represents the position in the y direction of the central axis of the metal plate 171. As shown in FIG. 2 to be described later, a relative position represented by a distance from a position P1 of the central axis of the metal plate 171 to a position P0 of the central axis of the coil 50 is expressed as dn (n is an integer of 0 or more). The relative position d0 in FIG. 1 means that the position P0 of the central axis of the coil 50 and the position P1 of the central axis of the metal plate 171 coincide, that is, the distance from the position P0 to the position P1 is zero. At this time, the coil 50 is completely opposed (facing to the metal plate 171). A position (relative position dn = d0) where the position P0 and the position P1 coincide (P0 = P1) or substantially coincide (P0≈P1) is the estimated power supply position of the coil 50. In this specification, the case where the position P0 and the position P1 match includes the case where the position P0 and the position P1 substantially match (P0≈P1).

  The gap G is the distance between the coil 50 and the metal plate 171 in the z direction. In other words, it is the distance between the surface of the coil 50 facing the metal plate 171 and the surface of the metal plate 171 facing the coil 50.

  In the present embodiment, the coil unit 1 is movable in the y direction, and the relative position dn of the coil unit 1 changes with time. The amount of movement of the coil unit 1 in the x and z directions is extremely small compared to the amount of movement in the y direction.

  The high-frequency signal output unit 10 generates a high-frequency signal for measurement and outputs it to the coil 50 under the control of the control unit 30 while the coil unit 1 is moving. The frequency of the high frequency signal is not limited to a specific frequency as long as the current value of the coil 50 can be appropriately measured.

  When a high frequency signal is supplied from the high frequency signal output unit 10 to the coil 50, the detection unit 20 detects a current flowing through the coil 50 (hereinafter also referred to as “coil current”) via a clamp. The detection unit 20 converts a current flowing through the coil 50 or an analog signal that fluctuates in accordance with the current into a digital signal and supplies the digital signal.

  The control unit 30 controls transmission and stop of the high-frequency signal of the high-frequency signal output unit 10 and performs a calculation using a current value (hereinafter also referred to as “measurement value”) of the current of the coil 50 detected by the detection unit 20. . Further, the control unit 30 stores the current value of the coil current detected by the detection unit 20 in the storage unit 35. As the control unit 30, a CPU (Central Processing Unit) or an MPU (Micro-Processing Unit) is used.

  The storage unit 35 is a non-volatile storage unit composed of a semiconductor memory or the like. The storage unit 35 stores a program executed by the control unit 30, data generated in the process in which the control unit 30 executes the program, and the like. The storage unit 35 stores the current value of the coil 50 detected by the detection unit 20. Further, the storage unit 35 stores a reference current value of the coil current that is referred to when the control unit 30 calculates the gap G between the coil 50 and the metal plate 171.

  The reference current value is set for each gap G (distance) of the coil 50 with respect to the metal plate 171 according to the relative position of the coil 50 with respect to the metal plate 171 in the moving direction of the coil 50 installed on the moving body.

  FIG. 2 is an explanatory diagram of the relative position dn of the coil unit 1 (coil 50) with respect to the position P1 of the central axis of the metal plate 171. FIG. FIG. 2 is a diagram of the yz plane showing the coil unit 1 and the metal plate 171. In FIG. 2, the position P0 of the central axis of the coil 50 and the position P1 of the central axis of the metal plate 171 do not coincide with each other, and the coil unit 1 is not the assumed power supply position. The relative position dn of the coil unit 1 is expressed as a distance from the position P0 to the position P1.

  FIG. 3 is a graph showing an example of the relationship between the relative position of the coil 50 relative to the assumed power feeding position and the coil current. FIG. 3 shows changes in the coil current at the relative position dn, where the vertical axis represents the relative position dn and the horizontal axis represents the coil current. As shown in FIG. 3, coil current change lines 25 to 27 were obtained for three gap values of 5 mm, 10 mm, and 15 mm.

  The coil current is a current when the current value when the metal plate 171 opposed to the coil 50 does not exist or exists far away is 1. When a current is passed through the coil 50 as a high frequency signal from the high frequency signal output unit 10, a current flows through the coil 50, and a current value is detected by the detection unit 20.

  The coil current when the metal plate 171 faces the coil 50 (dn: small) decreases compared to the coil current when the metal plate 171 does not face the coil 50 (dn: large). This is because when the coil 50 approaches the metal plate 171 and the magnetic flux generated by the coil 50 hits the metal plate 171, a current (magnetic flux) that cancels the magnetic flux is generated on the metal plate 171. This is because of the decrease. When the coil 50 approaches the metal plate 171, when the metal plate 171 is viewed from the coil 50, it appears as a resistance of the metal plate 171, and current does not easily flow through the coil 50. The impedance viewed from the coil 50 differs depending on the gap G (distance in the z direction) from the coil 50 to the metal plate 171 and the area of the metal plate 171 at a portion facing the coil 50.

  The detection unit 20 of the coil unit 1 detects the current of the coil 50 for each relative position dn. The current value of the coil current when the coil 50 and the metal plate 171 are greatly separated (d4) is 1. In the case of the relative position d4, since the resistance component of the metal plate 171 does not appear, the current easily flows through the coil 50, and the coil current detected by the detection unit 20 increases (close to 1). In the case where the coil 50 and the metal plate 171 are far apart, the coil current does not depend on the gap G and takes the same value in each gap G (coil current change lines 25 to 27).

  When the coil unit 1 moves and the coil 50 approaches the metal plate 171 (d3, d2), the area of the metal plate 171 facing the coil 50 increases. As a result, a resistance component appears, and the coil current detected by the detection unit 20 decreases. A difference appears in the coil current depending on the value of the gap G. For example, when the gap G is as small as 5 mm, the resistance component increases, so that the coil current becomes relatively small. On the other hand, when the gap G is as large as 15 mm, since the metal plate 171 is relatively far from the coil 50, the resistance component is small and the coil current is relatively large. According to the above configuration, since the behavior of the detected coil current differs for each gap G, the gap G can be estimated based on the coil current.

  As a method for estimating the gap G, the following three methods are conceivable. The first method is a method in which a gap value associated with a coil current change line including the reference measurement value is used as the gap G if the measurement value matches the reference measurement value at a certain relative position dn. When there is no reference measurement value that matches the measurement value, the gap G is estimated using the reference measurement value closest to the measurement value.

  In the second method, when there are a reference current value close to the measurement value and a reference current value larger than the measurement value and a reference current value smaller than the measurement value, an interpolation method (from the gap value associated with the two reference current values) This is a method for estimating the gap G by an interpolation method).

  The third method is a method of estimating the gap G from the slope of the coil current change line. For example, the control unit 30 measures the coil current at two points at the relative positions d3 and d2, and calculates the slope of the two measured values at the relative positions d3 and d2. And the control part 30 makes the gap value the gap value of the coil current change line with the inclination which corresponds to the inclination of two measured values. When there is no coil current change line having a slope that matches the slope of the two measured values, the gap G is estimated by applying the second method (interpolation method).

  By the way, error areas E1 and E2 indicated by hatching in FIG. 3 are areas where the measured values of the detected coil current are determined to be abnormal. The error region E1 is a region above the coil current change lines 25 to 27, and the error region E2 is a region below the coil current change lines 25 to 27. A predetermined margin obtained through experiments or the like is provided between the coil current change lines 25 to 27 and the error regions E1 and E2. The control unit 30 determines that the measured value is abnormal when the measured value of the coil current is within the error region E1 or the error region E2.

  For example, as an abnormality determination method, the control unit 30 determines that the measured value is abnormal (within the error areas E1 and E2) when the difference between the measured value at a certain relative position dn and the reference current value is equal to or greater than a predetermined value. A method of determining that there is a possibility is considered. As another determination method, an upper limit threshold value and a lower limit threshold value of the coil current are set in the storage unit 35 for each relative position dn to be measured, and the control unit 30 has a measured value equal to or higher than the upper limit threshold value or lower than the lower limit threshold value. If it is, it is determined that the measured value is abnormal (in the error areas E1 and E2). For example, at the relative position d3 in FIG. 3, the upper limit threshold value of the coil current is 0.17, and the lower limit threshold value is 0.64. Note that an upper threshold and a lower threshold may be set for each gap value. Further, the margin between the coil current change lines 25 to 27 and the error areas E1 and E2 may be set smaller or larger.

  In FIG. 3, the current value (measured value) of the coil current when the coil 50 and the metal plate 171 are largely separated (d4) is normalized as 1. However, it is normalized to calculations such as gap estimation and abnormality determination. Measurement values that are not used may be used.

  In 1st Embodiment comprised as mentioned above, the change of the coil electric current which flows into the coil 50 by the gap G of the coil 50 and the metal plate 171 differs. Therefore, the gap G (first distance) between the coil 50 and the metal plate 171 can be estimated based on the measured value and the reference current value for each relative position dn of the coil 50. And the gap (2nd distance) between the coil 50 and the power transmission side coil (for example, coil 150 of FIG. 5) is computable from the gap G (1st distance) of the coil 50 and the metal plate 171. FIG. If the distance between the coil 50 and the power transmission coil (second distance) can be calculated, the information on the distance can be used for power transmission-side control (for example, adjustment of the resonance frequency).

<2. Second Embodiment>
Next, an example of an elevator (elevator) including the non-contact power feeding device according to the first embodiment will be described as the second embodiment.

  FIG. 4 is a schematic configuration diagram of an elevator according to the second embodiment. The elevator 200 in FIG. 4 includes the non-contact power feeding device according to the first embodiment. The elevator 200 includes a hoistway 80 formed in a building structure, a car 2 (an example of a moving body) on which a user rides, a hoisting machine 3, a counterweight 4, and a car wound around the hoisting machine 3. 2 and a main rope 5 for suspending a counterweight 4.

  The hoistway 80 is formed in a building structure, and a machine room 82 is provided on the top thereof. The hoisting machine 3 is disposed in the machine room 82, and is rotated forward or reverse by a motor (not shown) and moves the car 2 up and down by winding the main rope 5. The car 2 is guided by a guide rail 83 extending in the y direction and moves up and down in the y direction. In other words, the car 2 moves in parallel to the radial direction of the winding of the coil 150 and the coil 50 (y direction). In FIG. 4, there is one guide rail 83, but two or more guide rails may be used. The hoisting machine 3 is provided with an encoder 3a that is directly connected to a motor (not shown) and generates a pulse proportional to the speed of the motor.

  The hoistway 80 is for a plurality of floors, and the car 2 stops at a landing level (stop) indicating a stop position of each floor according to the destination floor. The support 81 is a wall of the hoistway 80, a column, a guide rail, or the like. The coil unit 101 is fixed to the support 81 directly or indirectly via another object. The coil unit 1 is responsible for non-contact power transmission, and is installed on the first floor or the top floor (view floor) where many users of the hoistway 80 are present.

  A coil unit 1, a charging circuit 6 that charges the power received by the coil unit 1, and a storage battery 7 that is charged by the charging circuit 6 are installed in the lower floor of the car 2. As the storage battery 7, a capacitor, a lead storage battery, a lithium ion battery, or the like is used.

  The elevator control device 9 is installed in the machine room 82. The elevator control device 9 analyzes information (pulse signal) sent from the encoder 3 a of the elevator 200 and controls the operation of the car 2. The coil unit 1 can perform data communication with the elevator control device 9 by wireless communication. Further, the elevator control device 9 can perform data communication with the coil unit 101 by wired communication or wireless communication. The elevator control device 9 is connected to an elevator monitoring device (not shown) that monitors the state of the elevator 200 via a communication line.

  The position P0 represents the position of the central axis of the coil 50 in the coil unit 1 in the y direction. The position P1 represents the position of the central axis of the coil 150 (FIG. 5) and the metal plate 171 in the coil unit 101 in the y direction. When the car 2 arrives at the position P1 that is the power feeding position and stops (P0≈P1), the coil unit 101 starts power transmission. The coil unit 1 receives power from the coil unit 101, and the charging circuit 6 charges the storage battery 7 with the power received by the coil unit 1.

  FIG. 5 is a configuration diagram showing in detail the coil unit 1 and the coil unit 101 according to the second embodiment. Since the coil unit 1 in FIG. 5 has the same configuration as the coil unit in FIGS. 1 and 2, the description will be simplified, and the description will be made mainly focusing on the coil unit 101.

  The coil unit 101 includes an inverter circuit 111, a power source 112, a relay 115, a control unit 130, a storage unit 135, a communication unit 140, a coil 150, a magnetic body 160, and a metal plate 171.

  The coil 150 is a non-contact power feeding power transmission coil formed by winding a winding a plurality of times in a spiral shape or a spiral shape. The winding is preferably a good conductor such as copper. In FIG. 5, the coil 50 has a planar shape parallel to the yx plane as in FIGS. The winding diameters of the coil 50 in the x direction and the y direction may be the same or different.

  The magnetic body 160 is a plate-like magnetic body made of ferrite or the like. The magnetic body 160 is disposed on the back side of the coil 150 (the surface of the coil 150 opposite to the surface facing the coil 50) so as to be parallel to the coil 150.

  The metal plate 171 is provided on the support 81 so as to face the coil 50. The metal plate 171 is disposed on the support 81 so as to be parallel to the magnetic body 160 on the back side of the magnetic body 160 (the surface opposite to the surface on which the coil 150 of the magnetic body 160 is disposed). In the example of FIG. 5, the central axis (position P1) of the metal plate 171 in the y direction coincides with the central axis of the coil 150 in the y direction. The metal plate 171 also has a function of reducing (shielding) the magnetic flux generated by the coil 150 during non-contact power feeding.

  The metal plate 171 has a size and a shape facing the coil 50 before the coil 150 and the coil 50 face each other when the car 2 moves up and down. That is, the metal plate 171 has an end portion from the central axis (position P1) of the metal plate 171 in the lifting / lowering direction of the car 2 rather than half the winding diameter of the winding of the coil 150 in the lifting / lowering direction of the car 2. The length up to 171e1, 171e2 is long. The half length of the winding diameter of the coil 150 winding is the length from the position P1 to the ends 150e1 and 150e2 of the coil 150.

  The inverter circuit 111 (an example of an AC signal applying unit) is a resonance type inverter circuit that supplies a high-frequency AC signal to the coil 150. The AC signal output from the inverter circuit 111 is supplied to the coil 150 via the relay 115.

  The power source 112 is a power source for the inverter circuit 111. The voltage supplied from the power supply 112 to the inverter circuit 111 is, for example, commercial 200V.

  The relay 115 is a relay contact that connects and disconnects the inverter circuit 111 and the coil 150. The relay 115 is, for example, an electromagnetic relay, and the control unit 130 controls whether or not the control input current is supplied to the electromagnet of the electromagnetic relay.

  The control unit 130 controls transmission and stop of the high frequency signal of the inverter circuit 111. The control unit 130 controls the closing and opening of the contact of the relay 115 in accordance with the transmission and stop of the high frequency signal of the inverter circuit 111. A CPU or MPU is used as the control unit 30. In the following description, closing the contact of the relay 115 is referred to as “closing the relay 115”, and opening the contact of the relay 115 is referred to as “opening the relay 115”.

  The storage unit 135 is a non-volatile storage unit composed of a semiconductor memory or the like. The storage unit 135 stores a program executed by the control unit 130, data generated in the process in which the control unit 30 executes the program, and the like.

  The communication unit 140 is a communication interface that performs wireless communication with the communication unit 40 of the coil unit 1. The communication unit 140 may communicate with the elevator control device 9. In that case, the communication unit 140 may be a communication interface that performs wired communication.

  The communication unit 40 of the coil unit 1 is a communication interface that performs wireless communication with the communication unit 140 of the coil unit 101.

[Operation example of the non-contact power supply device until the start of power supply]
Next, an example of operation until the power supply start of the elevator 200 will be described.
FIG. 6 is a sequence diagram showing processing of the coil unit 1 and the coil unit 101 until the power supply to the elevator 200 is started.

  First, the control unit 130 of the coil unit 101 opens the relay 115 and shuts off the coil 150 and the inverter circuit 111 during a period in which power feeding is not performed (S1).

  When the control unit 30 of the coil unit 1 detects that the car 2 has started moving (S2), the control unit 30 commands the high-frequency signal output unit 10 to output a high-frequency signal. The high frequency signal output unit 10 starts outputting a high frequency signal to the coil 50 in accordance with a command from the control unit 30 (S3). The elevator control device 9 detects the movement of the car 2 based on the information obtained from the encoder 3a, and the control unit 30 moves the car 2 when the movement of the car 2 is detected by the elevator control device 9. Is determined to have started.

  Although the relay 115 is opened in step S1, the relay 115 may be open at least after step S3 so that the detection of the coil current by the detection unit 20 is not affected.

  Next, the control unit 30 starts measuring the current value of the current (coil current) flowing through the coil 50 at every predetermined position (relative position dn) or every predetermined time by the detection unit 20 (S4). Here, the metal plate 171 faces the coil 50 before the coil 150 and the coil 50 face each other when the car 2 moves.

  The control unit 30 acquires the measured value of the coil current by the detection unit 20, and stores the measured value of the coil current in the storage unit 35 (S5). The control unit 30 uses information obtained from the encoder 3 a installed in the hoisting machine 3 to grasp the position of the car 2. For grasping the time, an internal clock, a timer or the like of the control unit 30 (CPU or MPU) can be used.

  The control unit 30 compares the measured value of the coil current acquired by the detection unit 20 with the upper and lower thresholds (or the reference current value), and determines whether there is an abnormality in the measured value (S6). Here, the upper limit threshold and the lower limit threshold (or reference current value) are values measured in accordance with actual usage patterns. That is, each value is a value measured and set in a state where the coil 150 and the magnetic body 160 are disposed on the front surface of the metal plate 171.

  If there is an abnormality in the measured value in step S6 (YES in S6), the control unit 30 urgently stops power feeding using the coil 50. For example, the control unit 30 stops the charging circuit 6 immediately and stops charging the storage battery 7. Alternatively, the control unit 30 immediately requests the coil unit 101 to stop power transmission and stops the inverter circuit 111.

  If there is no abnormality in the measured value in step S6 (NO in S6), the control unit 30 estimates the gap G (first distance) between the coil 50 and the metal plate 171 from the difference between the measured value and the reference current value. (S7). And the control part 30 transmits the estimated value of the gap G to the coil unit 101 by the communication part 40, before the coil unit 1 arrives at an electric power feeding position (P1) (S8).

  The control unit 130 of the coil unit 101 receives the estimated value of the gap G from the coil unit 1 through the communication unit 140 (S9). Then, the control unit 130 calculates the distance (second distance) between the coil 150 and the coil 50 based on the estimated value of the gap G, and generates control information for the inverter circuit 111 from the distance between the coil 150 and the coil 50. Here, the distance between the coil 150 and the metal plate 171 is known and can be obtained by design data or actual measurement of the elevator 200. Therefore, if the gap G (first distance) between the coil 50 and the metal plate 171 is known, the distance (second distance) between the coil 150 and the coil 50 can be easily obtained.

  Next, before the coil unit 1 arrives at the power feeding position, the control unit 130 changes the control of the inverter circuit 111 based on the control information (S10), and closes the relay 115 (S11). For example, the control information is a set value of the frequency (switching frequency) of the switching operation by the inverter circuit 111. The switching frequency is adjusted according to the resonance frequency of the resonance circuit including the coil 150, for example.

  When the coil unit 1 of the car 2 arrives at the power feeding position, the coil unit 101 starts power transmission (S12). In step S10, the control (setting) of the inverter circuit 111 is changed in advance. Therefore, as soon as the coil unit 1 arrives at the power feeding position (P 1), the inverter circuit 111 can perform a switching operation at the changed switching frequency and output a high-frequency AC signal to the coil 150. Note that the control information is not limited to the set value of the inverter circuit 111. For example, information related to operation of the elevator 200 such as the elevator speed of the car 2 or the remaining capacity of the storage battery 7 may be used.

FIG. 7 is an explanatory diagram of the coil unit 1 and the coil unit 101 during power feeding.
In FIG. 7, the coil unit 1 has arrived at the power supply floor (P0≈P1), and the coil 50 of the coil unit 1 and the coil 150 of the coil unit 101 face each other.

[Example of operation when supplying power to a non-contact power supply device]
Next, an operation example from the start of power supply to the end of power supply of the elevator 200 will be described.
FIG. 8 is a sequence diagram showing processing of the coil unit 1 and the coil unit 101 from the start of power supply to the end of power supply of the elevator 200.

  First, when the coil unit 1 of the car 2 arrives at the power feeding position (P1), the coil unit 101 starts power transmission (S21). Step S21 corresponds to step S12 in FIG. The coil unit 1 receives power from the coil unit 101, and the charging circuit 6 starts charging the storage battery 7 (S22).

  Next, the control unit 30 of the coil unit 1 determines whether or not the car 2 has started moving (S23). When the car 2 starts moving (YES in S23), the control unit 30 stops charging the storage battery 7 by the charging circuit 6 (S25).

  On the other hand, when the car 2 is not moving (NO in S23), the control unit 30 determines whether or not the storage battery 7 is in a fully charged state (S24). If the storage battery 7 is not fully charged but needs to be charged (No in S24), the control unit 30 proceeds to step S23 and continues charging the storage battery 7 by the charging circuit 6.

  When the storage battery 7 is in a fully charged state (Yes in S24), the control unit 30 stops charging the storage battery 7 by the charging circuit 6 (S25).

  After stopping charging the storage battery 7 by the charging circuit 6 in step S25 (or in parallel), the control unit 30 requests the coil unit 101 to stop power transmission. The control unit 130 of the coil unit 101 receives the request to stop power transmission from the coil unit 1 and controls the inverter circuit 111 to stop power transmission (S26).

  Next, the control unit 130 of the coil unit 101 opens the relay 15 (S27). This is the same as the processing in step S1 in FIG.

  In the second embodiment configured as described above, the gap G between the coil 50 and the metal plate 171 is measured before the power receiving side coil 50 arrives at a position (power feeding position) directly facing the power transmitting side coil 150. Then, the distance between the coil 50 and the coil 150 is calculated. Then, before the car 50 and the coil 150 face each other and the car 2 stops (before power feeding is started), control on the power transmission side (setting change or the like) is performed in advance based on the distance between the coil 50 and the coil 150. Therefore, a longer power supply time can be ensured as compared with the conventional non-contact power supply method in which the optimum frequency is calculated and set after the power-receiving side coil and the power-transmission-side coil face each other at the power supply position.

  In addition, since the emergency stop of the car 2 can be quickly performed by determining in advance the abnormality in the measured value of the coil current, the safety in the non-contact power feeding can be improved.

<3. Third Embodiment>
Next, as a third embodiment, an example in which the position of the elevator is detected using the non-contact power feeding device of the present invention will be described. In the present embodiment, the position of the coil 50 on the movement path (in the hoistway 80) is detected by installing metal plates having different shapes on the movement path (each floor) of the car 2.

FIG. 9 is a schematic configuration diagram of an elevator according to the third embodiment.
The first floor (1F) of the elevator 200 is a power supply floor where the coil unit 101 is installed, and a metal plate 171 is installed. A metal plate 172 is installed on the second floor (2F), a metal plate 173 is installed on the third floor (3F), and a metal plate 177 is installed on the first basement floor (B1). The metal plates 171, 172, 173, and 177 have different shapes.

FIG. 10 is a diagram showing an example of the shape of the metal plates 172, 173, and 177.
When viewed from the coil 50 (z direction), the metal plate 172 is a parallelogram, the metal plate 173 is an isosceles triangle, and the metal plate 177 is a hexagon in which the upper left corner and the lower left corner of the rectangle are missing. In the present embodiment, such different shapes 172, 173, and 177 are installed at positions facing the coil units 1 (coils 50) on the respective floors using a support member (not shown).

  FIG. 11 is a graph showing an example of the relationship between the relative position of the coil 50 relative to the assumed power supply position and the coil current when using the metal plate 177, measured in the same manner as in FIG. In FIG. 11, the assumed power supply position is the relative position d0.

  As is clear from comparison with FIG. 3, the coil current (coil current change) in the case of the rectangular metal plate 171 is different from the coil current (coil current change) in the case of the metal plate 177. That is, the control unit 30 analyzes the coil current change and compares the coil current change of each metal plate registered in the storage unit 35 in advance, so that the coil 50 faces the metal plate 171 or the metal plate. 177 can be determined. If the type of the metal plate facing the coil 50 can be specified, it is possible to grasp which floor the car 2 on which the coil unit 1 is mounted is located. Moreover, if the metal plate facing the coil 50 can be specified, the relative position of the coil 50 with respect to the corresponding metal plate can be determined from the coil current change of the corresponding metal plate. Alternatively, the current position of the car 2 can be grasped from the type (floor) of the metal plate directly facing the coil 50 and the amount of movement from the directly-facing position calculated based on information obtained from the encoder 3a.

  The third embodiment configured as described above uses the fact that a difference in the coil current changes depending on the shape of the metal plate facing the coil 50, and determines the floor on which the corresponding metal plate is installed. That is, the position of the car 2 can be grasped by comparing the coil current change measured by raising and lowering the car 2 and the coil current change of each metal plate registered for each floor. Thereby, this embodiment can substitute the position sensor (an optical sensor, a magnetic sensor, etc.) conventionally used for detecting the position of the car 2.

[Modification of Third Embodiment]
FIG. 12 is a perspective view showing another example of the metal plate.
FIG. 13 is a side view showing another example of the metal plate.

  In addition, although the shape of the metal plates 171, 172, 173, and 177 is a planar shape (plate shape), it is not limited thereto. For example, the metal plate 178 in FIG. 12 has vertical portions 178b1 and 178b2 formed at the upper and lower ends of a rectangular or square main surface plate 178a, respectively. The end of the upper plate 178c1 is connected vertically to the other end of the vertical portion 178b1, and the end of the lower plate 178c2 is connected vertically to the other end of the vertical portion 178b2.

  An upper plate 178c1 and a lower plate 178c2 projecting from the vertical portions 178b1 and 178b2 in the y direction project to the surface 150s of the coil 150 in the z direction (FIG. 13). Thereby, a part of the metal plate 178 (the upper plate 178c1 and the lower plate 178c2) is positioned near the surface of the opposing coil 50. With the metal plate 178 having such a structure, the resistance component of the metal plate 178 is likely to appear when viewed from the coil unit 1 (coil 50) that measures the coil current, and the measurement accuracy is improved.

  Furthermore, since the vertical portions 178b1 and 178b2 are provided, workability when the worker supports the coil 150 and the magnetic body 160 on the metal plate 178 is improved. For example, the coil 150 and the magnetic body 160 can be temporarily placed on the vertical portion 178b2 on the lower side of the metal plate 178 installed perpendicular to the support member. This is easier for the worker than pressing the coil 150 and the magnetic body 160 against the vertical main plate 178a.

<4. Fourth Embodiment>
In the non-contact power feeding device according to the present invention, either the first coil or the second coil (the coil in which the coil current is detected) moves in parallel to the radial direction of the winding of each coil. It is placed on the body and the relative positional relationship between the two coils changes. In the first to third embodiments, the first coil corresponds to the coil 150 and the second coil corresponds to the coil 50. However, the second coil from which the coil current is detected may be on the power transmission side or the power reception side. Hereinafter, as a fourth embodiment, an example in which a long metal plate is provided on the power receiving side and a high frequency signal is supplied to the coil on the power transmission side to detect the relative position of the coil unit will be described.

FIG. 14 is a schematic configuration diagram of an elevator according to the fourth embodiment.
In the elevator 200B of FIG. 14, the coil unit 1B on the power receiving side has a metal plate 74 whose moving direction (y direction) is longer than that of the shield plate 70 (FIG. 1). Similar to the case of the metal plate 171, the metal plate 74 has a size and a shape facing the coil 150 before the coil 50 and the coil 150 face each other when the car 2 moves up and down. Both ends of the coil 50 are connected to the charging circuit 6, and the relay 16 is connected between the charging circuit 6 and one end of the coil 50. The relay 16 is controlled to be opened / closed by a control unit (not shown) in the car 2 or the elevator control device 9.

  The coil unit 101B on the power transmission side has a metal plate 70A whose length in the y direction is shorter than that of the metal plate 171.

  The inverter circuit 111 of the coil unit 101B has a function of outputting a high-frequency AC signal for measurement, and supplies the AC signal for measurement to the coil 150 before the coil unit 1 arrives at the power feeding position (position P1). . In addition, since the inverter circuit 111 exclusively supplies a power supply AC signal and a measurement AC signal to the coil 150, the relay 115 (FIG. 5) between the inverter circuit 111 and the coil 150 is unnecessary. is there.

  The detection unit 120 has a function equivalent to that of the detection unit 20 in FIG. When a high frequency signal is supplied from the inverter circuit 111 to the coil 150, the detection unit 120 detects a current (coil current) flowing through the coil 150 via a clamp.

  The control unit 130 calculates a coil current change line as shown in FIG. 3 from the measured value of the coil 150, and estimates the gap G (first distance) between the coil 150 and the metal plate 74 of the coil unit 1B. Then, based on the gap G between the coil 150 and the metal plate 74, a distance (second distance) between the coil 150 and the coil 50 is obtained. And the control part 130 changes control (setting of a switching frequency, etc.) of the inverter circuit 111 based on the distance of the coil 150 and the coil 50, before the coil unit 1B arrives at an electric power feeding position (P1).

  In the fourth embodiment configured as described above, the gap G between the power transmission side coil 150 and the power reception side metal plate 74 is measured on the power transmission side before the power reception side coil 50 arrives at the power feeding position. The distance between the coil 150 and the coil 50 is calculated. Then, before starting the power feeding, control (setting change or the like) on the power transmission side is performed in advance based on the distance between the coil 150 and the coil 50. Thereby, 4th Embodiment can ensure long power feeding time compared with the conventional non-contact power feeding method similarly to 2nd and 3rd Embodiment.

  In the fourth embodiment, since the coil current measurement is performed on the power transmission side, it is not necessary to transmit the gap estimation value from the power reception side to the power transmission side as in the first to third embodiments. Can be a closed system on the power transmission side. Therefore, a communication unit for performing communication between the power transmission side and the reception side can be deleted.

<5. Other>
The metal plate for measuring the coil current used in the first to fourth embodiments described above measures the coil current before the coil 50 and the coil 150 face each other when the car (moving body) moves. What is necessary is just to be formed so that the coil in the coil unit in which it may be performed may be opposed. Therefore, the shape of the metal plate may be annular. Alternatively, only the upper plates 178c1 and 178c2 of the metal plate 178 in FIG. 12 may be installed in the coil unit.

FIG. 15 is a perspective view illustrating an example of a metal plate having a through-hole portion.
The metal plate 170 has a through-hole portion 179h formed substantially at the center. For example, when the magnetic body 60 is removed from the coil unit 1, the magnetic flux generated in the coil 50 is not absorbed by the metal plate 179 in the through-hole portion 179h, so that loss of magnetic flux due to the metal plate 179 can be reduced. The diameter of the through-hole portion 179h is arbitrary, but is preferably determined in consideration of the shield function of the metal plate 179.

  Further, only the upper plate 178c1 and the lower plate 178c2 projecting in the y direction of the metal plate 178 may be used as the metal plate. However, considering the shielding function of the metal plate, it is desirable that the metal plate has a size and a shape facing the entire coil surface.

  In the first to fourth embodiments described above, since the distance between the coil 150 of the coil unit fixed to the hoistway 80 and the coil 50 of the coil unit installed in the car 2 is calculated, the guide The distortion of the rail 83 can be measured. The detection result of the distortion of the guide rail 83 can be used for maintenance.

  Furthermore, in the second to fourth embodiments described above, the power charged in the storage battery 7 of the car 2 is sent to the floor different from the floor where the coil units 101 and 101B on the power transmission side are provided via the coil 50. You may make it supply to the coil unit installed in.

  Furthermore, the present invention is not limited to the above-described embodiments, and various other application examples and modifications can be taken without departing from the gist of the present invention described in the claims. is there.

  For example, the above-described exemplary embodiments are detailed and specific descriptions of the configuration of the apparatus and the system in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described above. . Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment. In addition, the configuration of another embodiment can be added to the configuration of a certain embodiment. Moreover, it is also possible to add, delete, and replace other configurations for a part of the configuration of each exemplary embodiment.

  Each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files for realizing each function can be stored in a recording device such as a memory, a hard disk, or an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

  Further, the control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

  Further, in this specification, the processing steps describing time-series processing are not limited to processing performed in time series according to the described order, but are not necessarily performed in time series, either in parallel or individually. The processing (for example, parallel processing or object processing) is also included.

  DESCRIPTION OF SYMBOLS 1 ... Coil unit (power receiving side), 2 ... Car, 6 ... Charging circuit, 7 ... Storage battery, 10 ... High frequency signal output part, 20 ... Detection part, 30 ... Control part, 35 ... Memory | storage part, 40 ... Communication part, DESCRIPTION OF SYMBOLS 50 ... Coil, 60 ... Magnetic body, 70 ... Shield plate, 80 ... Hoistway, 81 ... Support body, 82 ... Machine room, 83 ... Guide rail, 101, 101B ... Coil unit (power transmission side), 111 ... Inverter circuit, DESCRIPTION OF SYMBOLS 120 ... Detection part, 130 ... Control part, 135 ... Memory | storage part, 140 ... Communication part, 150 ... Coil, 150e1, 150e2 ... End part, 160 ... Magnetic body, 171, 172, 173, 177 ... Metal plate (conductor plate) , 171e1, 171e2 ... end, 178 ... metal plate, 178a ... main surface plate, 178b1, 178b2 ... vertical portion, 178c1 ... upper plate, 178 2 ... lower plate, 179 ... metal plate, 179H ... through hole, 200, 200A, 200B ... elevator, E1, E2 ... error area, G ... gap, P0, P1 ... position

Claims (9)

Either the first coil or the second coil is installed in a moving body that moves parallel to the radial direction of the winding of the first coil and the second coil, and the first coil and the second coil A non-contact power feeding device in which the relative positional relationship of
The second coil is disposed on a surface opposite to the surface facing the second coil in the first coil, and the second coil is disposed before the first coil and the second coil are opposed when the moving body moves. A conductor plate formed to face the coil;
A high-frequency signal output unit for supplying a high-frequency signal to the second coil;
A detection unit for detecting a current flowing through the second coil when the high-frequency signal is supplied;
Before the first coil and the second coil face each other when the moving body moves, the current value of the second coil detected by the detection unit and the second coil relative to the conductor plate Based on a reference current value set for each distance, a first distance that is a distance of the second coil to the conductor plate is estimated, and based on the first distance, between the first coil and the second coil. And a controller that calculates a second distance that is a distance. The non-standard according to claim 1, wherein the reference current value is set according to a relative position of the second coil with respect to the conductor plate in a moving direction of the movable body for each distance of the second coil with respect to the conductor plate. Contact power supply device. The first coil is a power transmission coil, and the second coil is a power reception coil that receives power from the first coil in a non-contact manner;
An AC signal applying unit that applies an AC signal to the power transmission coil;
The frequency of the AC signal applied to the power transmission coil from the AC signal application unit is adjusted based on the second distance between the power transmission coil and the power reception coil calculated by the control unit. The non-contact electric power feeder as described in. While the power transmission coil is installed on the moving path of the mobile body, the power receiving coil is installed on the mobile body,
The AC signal application unit adjusts the frequency of the AC signal applied to the power transmission coil before the mobile body stops at a position where the power reception coil of the mobile body and the power transmission coil in the movement path face each other. The contactless power feeding device according to claim 3. A plurality of the conductive plates having different shapes are provided on the moving path of the moving body,
The control unit compares the current value of the second coil detected by the detection unit with the reference current value for each of the plurality of conductor plates, and the second coil on the moving path is compared based on a comparison result. The non-contact power feeding apparatus according to claim 1, wherein the position of is calculated. The control unit stops power supply using the second coil when a difference between the current value of the second coil detected by the detection unit and the reference current value is equal to or greater than a predetermined value. Item 2. The non-contact power feeding device according to Item 1. The contactless power supply device according to claim 1, wherein the second coil is a power transmission coil, and the first coil is a power reception coil that receives power from the second coil in a contactless manner. The conductor plate has a longer length from the center to the end of the conductor plate in the moving direction of the moving body than a half length of a winding diameter of the winding of the first coil in the moving direction of the moving body. The contactless power supply device according to claim 1.   An elevator provided with the non-contact power feeding device according to claim 1.

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