JP5601460B2 - Power saving drive apparatus and method for apparatus having the same load pattern - Google Patents

Description

  The present invention relates to a power saving driving apparatus and method for apparatuses having the same load pattern.

The present invention is directed to a device that is driven by a motor that is powered by a non-contact power transmission device and that has the same load pattern. Hereinafter, such a device is referred to as a “same load pattern device”.
In addition, although the same load pattern apparatus mainly assumes industrial apparatuses, such as a conveying apparatus installed on moving bodies, such as an unmanned conveying cart, and a physical distribution apparatus, it is not limited to them.

The loss amount in the same load pattern device described above varies depending on the parameters of the non-contact power transmission device, for example, the oscillation frequency of the non-contact power transmission device.
Here, the “loss amount” means the difference between the power supplied by the non-contact power transmission device and the motor output, that is, the generation of heat generation and electromagnetic radiation in the electric circuit from the non-contact power transmission device to the motor and the magnetic circuit inside the motor. This means the amount of work lost in form.

  For example, Patent Documents 1 to 6 have already been proposed as means for increasing transmission efficiency in a non-contact power transmission apparatus.

JP 2009-225551 A, “Power Transmission System” JP 2008-236916, “Non-contact power transmission device” JP 2010-158151, “Non-contact power transmission device” JP 2010-141977, “Power transmission method and non-contact power transmission apparatus in non-contact power transmission apparatus” JP 2010-130878, "Non-contact power transmission device" JP 2010-141976, “Non-contact power transmission device”

Patent Documents 1 to 6 described above do not target the “same load pattern”.
Therefore, when the relative position of the power feeding antenna coil and the power receiving antenna coil constituting the non-contact power transmission device fluctuates, for example, when power is transmitted in a non-contact manner when a moving body such as an unmanned transport cart stops, The effect of changing the stop position each time the vehicle stops can not be compensated, and there is a problem that the efficiency of power transmission is reduced.

  Further, the non-contact power transmission device has a problem that the efficiency of power transmission is reduced even by a temperature change.

  The present invention has been developed to solve the above-described problems. That is, the object of the present invention is to automatically increase the efficiency of non-contact power transmission even when there is a change in the resonant frequency with changes in temperature, etc., or a change in the relative position of the antenna coil on the power supply side and the power reception side. An object of the present invention is to provide a power saving driving apparatus and method for an apparatus having the same load pattern that can be maintained.

According to the present invention, a power-saving drive device for a device driven by a motor supplied with power by a non-contact power transmission device and having the same load pattern,
An electric energy calculator for calculating the primary electric energy of the contactless power transmission device in the same load pattern;
The parameter of the non-contact power transmission device is changed to a plurality of values, the primary power amount in each parameter is compared, the parameter that minimizes the primary power amount is selected, and the non-contact power transmission device is Parameter selection / commander to command,
A command value generator provided on the power receiving side and outputting a cycle start signal and a cycle end signal of the same load pattern;
A transmission side and a reception side wireless signal transmission device for wirelessly transmitting the cycle start signal and the cycle end signal ;
The power amount calculator calculates a power amount of one cycle from the time when the cycle start signal is input to the time when the cycle end signal is input. A power driver is provided.

  The parameter of the non-contact power transmission device is preferably an oscillation frequency on the power feeding side.

According to the present invention, there is also provided a power saving driving method for a device driven by a motor supplied with power by a non-contact power transmission device and having the same load pattern,
Change the parameter of the non-contact power transmission device to multiple values,
A command value generator provided on the power receiving side outputs a cycle start signal and a cycle end signal of the same load pattern,
The cycle start signal and the cycle end signal are transmitted wirelessly by the radio signal transmission device on the transmission side and the reception side,
Non-contact power transmission by the same load pattern in each parameter by calculating the power amount of one cycle from the time when the cycle start signal is input to the time when the cycle end signal is input by the power amount calculator Calculate the primary energy of the device,
The apparatus having the same load pattern characterized by comparing the primary power amount in each parameter, selecting a parameter that minimizes the primary power amount, and instructing the non-contact power transmission device A power saving driving method is provided.

According to the apparatus and method of the present invention, the apparatus includes a power amount calculator and a parameter selector / commander, changes the parameter of the non-contact power transmission apparatus to a plurality of values, and the non-contact power by the same load pattern in each parameter. Since the primary power amount of the transmission device is calculated and compared, and the parameter that minimizes the received power amount is selected and commanded to the non-contact power transmission device, the change in the resonance frequency with changes in temperature, etc. Even if there is a change in the relative positions of the antenna coils on the power feeding side and the power receiving side, the efficiency of non-contact power transmission can be automatically maintained high.

It is a figure which shows 1st Embodiment of the power saving drive device by this invention. It is operation | movement explanatory drawing of the same load pattern apparatus which 1st Embodiment of this invention makes object. It is operation | movement explanatory drawing of the parameter selection and command device 83 by 1st Embodiment. It is a figure which shows the example which redoes the search and determination of a parameter for every 100 cycles. It is a figure which shows the example which redoes the search and determination of a parameter in the apparatus which has a some operation | movement pattern. It is a figure which shows 2nd Embodiment of the power saving drive device by this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

[First Embodiment]
FIG. 1 is a diagram showing a first embodiment of a power-saving drive device according to the present invention.

In this figure, 11 is an external power source, which is a power source supplied from an electric power company or a private power generator. The external power supply 11 is assumed to supply a three-phase alternating current in this embodiment, but may be another form of power supply such as a single-phase alternating current.
Reference numeral 13 denotes a converter, which converts electric power supplied from the external power supply 11 into direct current and supplies it to the non-contact power transmission device 40. The converter 13 is assumed to be a diode bridge in this embodiment, but may be a thyristor bridge whose voltage is variable by phase control, or a bridge using a power control element such as a power MOSFET or IGBT.

Reference numeral 19 denotes an inverter that controls the current / voltage flowing from the non-contact power transmission device 40 to the motor 21 so that the motor 21 generates a desired torque. The inverter 19 is assumed to be a voltage type inverter in this embodiment, but may be a current type inverter. In the case of a current type inverter, a reactor is used instead of the capacitor at the output of the non-contact power transmission device.
Further, in this embodiment, the inverter 19 is assumed to be a four-quadrant drive inverter capable of forward / reverse rotation, power running / regeneration of the motor 21, but depending on the characteristics and operation of the mechanical load 23 (same load pattern device), The inverter may be capable of rotating only in one direction or powering only.

Reference numeral 21 denotes a motor. The combination of the inverter 19 and the motor 21 causes the motor 21 to generate torque following the torque command value input from the controller 27.
In this embodiment, the motor 21 is assumed to be a three-phase induction motor or a three-phase permanent magnet synchronous motor. However, other types of motors may be used as long as the torque and rotational speed are variable in combination with an inverter.

Reference numeral 23 denotes a mechanical load, that is, the same load pattern device, which is driven by the motor 21.
Reference numeral 25 denotes a motor encoder, which measures the rotational position (angle) of the motor 21. As the motor encoder 25, an optical or magnetic rotary encoder or resolver is used. When the controller 27 performs speed control, the rotational speed (angular speed) of the motor 21 may be measured. In this case, the rotational position measured with a rotary encoder or resolver may be time-differentiated, or the rotational speed may be directly measured like a tachometer.

Reference numeral 27 denotes a controller, and the inverter 19, the motor 21, the motor encoder 25, and the controller 27 form a feedback loop, and controls the motor 21 to follow the command value from the command value generator 29.
The controller 27 assumes position control in this embodiment, but may be speed control. As a calculation method inside the controller, PID (Proportional Integral Derivative) control, I-PD (Integral Proportional Derivative) control, and the like are often used, but other control methods may be used. A feedforward calculation for improving controllability may be combined. The controller 27 can be realized by a programmable device using DSP (Digital Signal Processor), a microcomputer, an analog circuit, or a combination thereof.

  A command value generator 29 outputs a motor rotation angle command value Ac to be followed by the motor 21 to the controller 27 at each time. For transmission of the motor rotation angle command value Ac, transmission by a two-phase pulse train whose phase is shifted by 90 degrees or transmission by various communication networks is used. Since the rotation angle of the motor 21 and the mechanical load 23 are mechanically linked, instructing the rotation angle of the motor 21 has the same meaning as instructing the position of the mechanical load 23.

  The command value generator 29 can be realized by a programmable device using a DSP or a microcomputer having a storage device such as a semiconductor memory.

Reference numeral 40 denotes a non-contact power transmission device that transmits power from the power feeding side to the power receiving side in a non-contact manner using DC as an input and output.
In FIG. 1, the non-contact power transmission device 40 includes a power feeding side circuit and a power receiving side circuit.
In this example, the power supply side circuit includes a power supply antenna coil 41, an oscillation circuit 43, a drive clock generation circuit 44, a driver control circuit 45, and a driver 46.
In this example, the power receiving side circuit includes a power receiving antenna coil 42, a capacitor C1, a rectifier circuit 47 including four rectifier diodes, and a smoothing capacitor C2. The power receiving antenna coil 42 and the capacitor C1 form a resonance circuit.

A signal having an arbitrary frequency (oscillation frequency) is supplied from the oscillation circuit 43, the drive clock generation circuit 44, the driver control circuit 45, and the driver 46 to the power feeding antenna coil 41.
When a signal having an arbitrary frequency (oscillation frequency) is supplied to the power feeding antenna coil 41, an induced voltage is generated at both ends of the power receiving antenna coil 42 due to electromagnetic coupling, and this induced voltage passes through the rectifier circuit 47. Then, it is stored in the smoothing capacitor C <b> 2, becomes a smoothed DC voltage, and is supplied to the inverter 19.

The oscillation circuit 43 of the power supply side circuit is a circuit that generates a pulse having a desired frequency, for example. Control of the oscillation operation of the oscillation circuit 43 is performed by the parameter selector / commander 83.
The drive clock generation circuit 44 is a circuit that generates a drive clock having a predetermined frequency based on the output of the oscillation circuit 43, and the parameter selection / command device 83 controls the frequency.
The driver control circuit 45 generates a signal for operating the driver 46 based on the drive clock generated by the drive clock generation circuit 44 and outputs the signal to the driver 46.
The driver 46 includes a plurality of amplifiers and a capacitor C3, and is a circuit that drives a series resonance circuit.

As means for causing the oscillation circuit 43 to oscillate at a frequency corresponding to the transmission frequency command value, there are the following means.
(1) The output of a crystal oscillator having a frequency much higher than the oscillation frequency is divided by a digital counter. The oscillation frequency can be changed by changing the value counted up by the counter.
(2) An oscillation circuit is constituted by the digital PLL, and the count-up value of the PLL frequency dividing counter is changed.
(3) An analog oscillation circuit is configured using an element such as a varicap whose capacitance changes with voltage.

  Reference numeral 50 denotes a radio signal transmission apparatus, which includes a radio signal transmission apparatus 52 on the transmission side and a radio signal transmission apparatus 54 on the reception side. In order to take advantage of the non-contact power transmission, no signal transmission cable is connected between the power supply side and the power reception side, and the cycle start signal Cs and the cycle end signal Ce are transmitted wirelessly. There are a transmission method using radio waves such as a wireless LAN, and a method of modulating and transmitting light by arranging a light-emitting element for signal transmission and a light-receiving element to face each other during non-contact power transmission operation.

61 is a voltage measuring device, and 63 is a current measuring device. The voltage measuring device 61 and the current measuring device 63 measure the voltage and the current, respectively, in order to calculate the amount of power flowing into the non-contact power transmission device 40, and the voltage measurement value V (t) and the current measurement value I (t). Is output to the electric energy calculator 81. The voltage measurement value V (t) and the current measurement value I (t) can be transmitted digitally by means of analog transmission as voltage amplitude or current amplitude, or by using various communication networks.
The voltage on the plus side with respect to the minus side at time t measured by the voltage measuring device 61 is denoted as V (t). Further, the current flowing from the left to the right in the drawing on the positive side of the direct current at time t measured by the current measuring device 63 is denoted as I (t). A negative current measurement value indicates that current flows from right to left in the figure.

81 is an electric energy calculator, and calculates electric energy W of 1 cycle. That is, a value obtained by multiplying the voltage measurement value V (t) and the current measurement value I (t) is time-integrated from the time when the cycle start signal Cs is input to the time when the cycle end signal Ce is input, and then output. For the transmission of the electric energy W in one cycle, it is possible to perform digital transmission using means for analog transmission as voltage amplitude and current amplitude, and various communication networks.
The electric energy calculator 81 can be realized by a programmable device using a DSP or a microcomputer, an analog electronic circuit, or a combination thereof.
The electric energy calculator 81 performs the following calculation.
The power P (t) at time t is the product of voltage and current, and is expressed by equation (1). Here, when P (t) is a positive value, power flows from left to right in the figure, and when P (t) is a negative value, power flows from right to left in the figure.
P (t) = V (t) × I (t) (1)

  Since the power amount W of one cycle is a time integral of the power, if the time of the cycle start signal for the cycle is written as T1, and the time of the cycle end signal is written as T2, it is expressed by Equation (2) of Formula 1.

If the calculation by the electric energy calculator 81 is performed in the period of time ΔT, the equation (2) is differentiated, and V (t) × I (t) × ΔT is integrated from time T1 to time T2. It becomes the electric energy W of the cycle. In other words, at the end of the cycle, it is possible to output one cycle of electric power for that cycle.
As described above, the present invention is applicable even when power running and regeneration are mixed in one cycle by allowing negative values for the current measurement value and power. That is, positive and negative power corresponds to power running and regeneration, respectively.

  Reference numeral 83 denotes a parameter selection / commanding unit that commands a parameter value that affects the loss amount, and selects an appropriate parameter value based on the electric energy of one cycle in each cycle. In this embodiment, the parameter is the oscillation frequency of the non-contact power transmission device, and the parameter selector / commander 83 outputs the oscillation frequency command value F to the transmission circuit 43. The parameter selector / commander 83 can be realized by a programmable device using a DSP or a microcomputer.

FIG. 2 is an operation explanatory diagram of the same load pattern device targeted by the first embodiment.
Since the present invention is intended for a device that is repeatedly operated with the same load pattern (same load pattern device), in this embodiment, as shown in the figure, the motor rotation angle command value Ac is a cycle (same repeated pattern). The command value generator 29 outputs a cycle start signal Cs and a cycle end signal Ce at the start time and end time of the cycle, respectively.

In FIG. 2, C1, C2, and C3 indicate cycles. An arbitrary command value, for example, a command value for stopping the mechanical load 23 or a command value for operating the mechanical load 23 according to a manual operation may be output between cycles. Therefore, for the sake of simplification in the following description, a command value for stopping the mechanical load 23 between cycles is output.
In this figure, the cycle start signal Cs and the cycle end signal Ce are pulse signals. However, other signal waveforms such as a cycle start is indicated by a rising edge of the signal and a cycle end is indicated by a falling edge of the signal. Good.
In addition, when the controller 27 performs speed control, the command value generator 29 may output a motor rotation speed command value.

FIG. 3 is an operation explanatory diagram of the parameter selection / commander 83.
The procedure for searching and determining a parameter for reducing the loss by the parameter selector / commander 83 is as follows.
The parameter selector / commander 83 outputs a different oscillation frequency command value F for each cycle. At the end of the cycle, a power amount W for one cycle for each cycle is output from the power amount calculator 81 and is stored in the parameter selector / commander 83. The parameter selector / commander 83 compares the stored power amount W for one cycle, and outputs the oscillation frequency command value F with the smallest power amount as the subsequent oscillation frequency command value F.

  As an example, as shown in FIG. 3, it is assumed that the oscillation frequency command value F is changed to F1, F2, F3, F4, F5 in each of five cycles (C1, C2, C3, C4, C5 in the figure) Assume that the amount of power in one cycle in each cycle is W1, W2, W3, W4, and W5. W1, W2, W3, W4, and W5 are stored and compared when cycle 5 (C5 in the figure) ends. If W4 is the smallest, the oscillation frequency command value F4 corresponding to W4 is the most lossy. It can be seen that this is an oscillation frequency command value that reduces the frequency. Therefore, the parameter selector / commander 83 continues to output F4 as the oscillation frequency command value thereafter.

  In the example shown in FIG. 3, the oscillation frequency command value F is changed in five ways from F1 to F5, and search and determination of the parameter (oscillation frequency command value) requires five cycles C1 to C5. The number for changing the oscillation frequency command value F is not limited to 5, and may be a number Q of 2 or more. In this case, Q cycles are required to search and determine the parameter (oscillation frequency command value).

  For example, the following (1) to (3) are conceivable as timings for searching and determining parameters.

(1) When the relative positional relationship between the feeding antenna coil and the receiving antenna coil changes.
For example, typically, when a power receiving antenna coil is mounted on a moving body and power is transmitted while the moving body is stopped, the moving body moves and stops again.

(2) When environmental conditions for changing the resonance frequency such as the temperature of the circuit element change.
For example, the actual measurement of changes in environmental conditions using a thermometer or the like may be used to search and determine parameters when a change of a certain value or more occurs, or when a certain number of cycles or a certain amount of time has elapsed The parameter may be searched and determined again.
As a method for realizing the latter, for example, a counter for counting the number of occurrences of the cycle start signal or cycle end signal or a timer for measuring the elapsed time is provided in the parameter selection / commander, and the counter value or the timer value is constant. When the value is reached, the parameter search / determination is performed again, and at the same time, the counter or timer is reset and the cycle count or elapsed time measurement is restarted.

(3) In a case where the present invention is applied to an apparatus having a plurality of operation patterns (for example, a conveyance device that conveys a plurality of objects and the conveyance locus changes depending on the object), immediately after the operation patterns are switched. Search and determine parameters. For example, a controller (not shown) instructing switching of the operation pattern is configured to notify the parameter selection / commander of the switching of the operation pattern, and when the switching of the operation pattern is notified, the parameter is searched and determined. .

  Note that the timing for searching and determining parameters may be determined by a combination of the above timings. Moreover, the above is an example, and the timing of parameter search / determination is not limited to these.

FIG. 4 is a diagram illustrating an example of redoing the parameter search / determination every 100 cycles.
In this example, the oscillation frequency command value is changed as shown in FIG. The oscillation frequency command value F is changed to F1, F2, F3, F4, and F5 for each of the first five cycles (C1, C2, C3, C4, and C5 in the figure), and one cycle of power in each cycle Assume that the amounts are W1, W2, W3, W4, and W5. W1, W2, W3, W4, and W5 are stored and compared when the cycle 5 (C5 in the figure) ends. If W4 is the smallest, the oscillation frequency command value F4 corresponding to W4 is obtained at this time. Therefore, the parameter selector / commander 83 uses F4 as the oscillation frequency command value until 100 cycles have elapsed (that is, with respect to cycles C6 to C100). Continue to output.

After 100 cycles, the oscillation frequency command value F is changed to F1, F2, F3, F4, and F5 for each of 5 cycles (C101, C102, C103, C104, and C105 in the figure). Assume that the amount of power in one cycle in W1 ′, W2 ′, W3 ′, W4 ′, and W5 ′. W1 ′, W2 ′, W3 ′, W4 ′, W5 ′ are stored and compared at the end of the cycle 105 (C105 in the figure). If W3 ′ is the smallest, the oscillation corresponding to W3 ′ Since it can be seen that the frequency command value F3 is the oscillation frequency command value that minimizes the loss at this time, the parameter selector / commander 83 thereafter performs 100 cycles (that is, for cycles C106 to C200). Continue to output F3 as the oscillation frequency command value.
Thereafter, the above operation is repeated every 100 cycles. FIG. 4 shows the first 201 cycles (C1 to C201 in the figure).

  When the temperature around the device changes, the device continues to operate and the device generates heat, the temperature of the circuit elements changes, and the resonance frequency of the resonance circuit changes, the non-contact power transmission device transmits power most efficiently. Parameters that can be changed (oscillation frequency in this embodiment) may also change. However, by searching and re-determining the oscillation frequency command value by the above method, the parameter that allows the contactless power transmission device to transmit power most efficiently at all times. (Oscillation frequency).

  FIG. 5 is a diagram illustrating an example of performing parameter search / determination again in an apparatus having a plurality of operation patterns.

  The oscillation frequency command value F is changed to F1, F2, F3, F4, and F5 for each of the first five cycles (C1, C2, C3, C4, and C5 in the figure) operated in the pattern 1, and each cycle. Assume that the amount of power in one cycle in W1 is W1, W2, W3, W4, and W5. W1, W2, W3, W4, and W5 are stored and compared when cycle 5 (C5 in the figure) ends. If W1 is the smallest, the oscillation frequency command value F1 corresponding to W1 is the pattern 1 Therefore, the parameter selector / commander 83 continues to output F1 as the oscillation frequency command value while operating in the pattern 1 since it is the oscillation frequency command value that minimizes the loss.

  When the operation pattern is switched to pattern 2, the oscillation frequency command value F is set to F1, F2, F3, for each of the first five cycles (C1, C2, C3, C4, C5 in the figure) operated in pattern 2. Assume that the electric energy in one cycle in each cycle is W1 ′, W2 ′, W3 ′, W4 ′, and W5 ′. W1 ', W2', W3 ', W4', W5 'are stored and compared at the end of cycle 5 (C5 in the figure). If W5' is the smallest, oscillation corresponding to W5 ' Since it can be seen that the frequency command value F5 is the oscillation frequency command value that minimizes the loss with respect to the pattern 2, the parameter selector / commander 83 subsequently uses F5 as the oscillation frequency command value while operating in the pattern 2. Will continue to be output.

[Second Embodiment]
FIG. 6 is a diagram showing a second embodiment of the power-saving drive device according to the present invention.
In this example, there are a plurality of inverters and motors, and the command value generator 29 sends a motor rotation angle command value Ac ′ that the motor 21A should follow to the controller 27A and a motor that the motor 21B should follow at each time. The rotation angle command value Ac ″ is output to the controller 27B. The movement of the plurality of motors may be any of the following.
(1) All motors move in the same way. For example, since the size of the motor is limited, the integrated mechanical load is driven by a plurality of motors. In this case, the motor rotation angle command value Ac ′ that the motor 21A should follow and the motor rotation angle command value Ac ″ that the motor 21B should follow should always be the same value.
(2) Movement differs for each motor. For example, this is a case where an articulated robot has a motor for driving each joint. In this case, the motor rotation angle command value Ac ′ to be followed by the motor 21A and the motor rotation angle command value Ac ″ to be followed by the motor 21B are generally different values.
This figure shows an example in which two inverters and motors are used in the first embodiment. In this example, the case of two inverters and motors is shown, but the same applies to the case of three or more motors.

Since the following components are provided for each inverter and motor, they are identified by adding A and B at the end. The configuration of each element is the same as in the first embodiment.
19A, 19B Inverter 21A, 21B Motor 23A, 23B Mechanical load 25A, 25B Motor encoder 27A, 27B Controller

  For the two sets with A and B at the end, power is supplied via one non-contact power transmission device, so the same energy calculation and parameter search / determination operations as in the first embodiment are performed. Thus, the parameter (oscillation frequency command value F) is searched and determined so as to reduce the loss of the two sets of totals.

  In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention. For example, it can be changed as follows.

  The above-described cycle of the present invention only needs to be a section in which the apparatus moves in the same manner, and does not have to exactly coincide with the operation cycle of the apparatus to which the present invention is applied. For example, only a section in which the apparatus moves strongly and a large current flows through the motor may be treated as a cycle in the present invention.

The motor 21 may be a linear motor instead of the rotary motor.
Instead of the motor encoder, a rotary encoder or linear encoder that directly detects the position / speed of the mechanical load may be used.
Instead of a combination of an external power source and a converter, direct current may be directly supplied from a direct current power source (a direct current generator, a fuel cell, a battery, or the like).

11 external power supply, 13 converter,
19, 19A, 19B inverter,
21, 21A, 21B motor,
23, 23A, 23B Mechanical load (same load pattern device),
25, 25A, 25B motor encoder,
27, 27A, 27B controller,
29 command value generator,
40 contactless power transmission device, 41 power supply antenna coil,
42 antenna coil for receiving power, 43 oscillation circuit,
44 drive clock generation circuit, 45 driver control circuit,
46 driver, 47 rectifier circuit,
50 wireless signal transmission device,
52 wireless signal transmission device on transmission side, 54 wireless signal transmission device on reception side,
61 voltage measuring device, 63 current measuring device,
81 Electric energy calculator, 83 Parameter selection / commander

Claims (3)

A power-saving drive device driven by a motor supplied with power by a non-contact power transmission device and having the same load pattern,
An electric energy calculator for calculating the primary electric energy of the contactless power transmission device in the same load pattern;
The parameter of the non-contact power transmission device is changed to a plurality of values, the primary power amount in each parameter is compared, the parameter that minimizes the primary power amount is selected, and the non-contact power transmission device is Parameter selection / commander to command,
A command value generator provided on the power receiving side and outputting a cycle start signal and a cycle end signal of the same load pattern;
A transmission side and a reception side wireless signal transmission device for wirelessly transmitting the cycle start signal and the cycle end signal ;
The power amount calculator calculates a power amount of one cycle from the time when the cycle start signal is input to the time when the cycle end signal is input. Power drive device. The power-saving drive device for a device having the same load pattern according to claim 1 , wherein the parameter of the non-contact power transmission device is an oscillation frequency on a power feeding side. A power-saving driving method for a device driven by a motor supplied with power by a non-contact power transmission device and having the same load pattern,
Change the parameter of the non-contact power transmission device to multiple values,
A command value generator provided on the power receiving side outputs a cycle start signal and a cycle end signal of the same load pattern,
The cycle start signal and the cycle end signal are transmitted wirelessly by the radio signal transmission device on the transmission side and the reception side,
Non-contact power transmission by the same load pattern in each parameter by calculating the power amount of one cycle from the time when the cycle start signal is input to the time when the cycle end signal is input by the power amount calculator Calculate the primary energy of the device,
The apparatus having the same load pattern characterized by comparing the primary power amount in each parameter, selecting a parameter that minimizes the primary power amount, and instructing the non-contact power transmission device Power saving drive method.