JPH08258793A - Motor-driven propulsion device for ship - Google Patents

Abstract

PURPOSE: To provide a motor-driven propulsion device for a ship which is so constituted as to prevent the damage of a motor and a battery during a turn or the occurrence of cavitation, prevent the occurrence of rapid starting during starting, and perform full charging of a storage battery during charging. CONSTITUTION: A motor-driven propulsion device 1 for a ship is provided with a motor 31 and a current feeding means 32 to feed a drive current to the motor 31 from a storage battery 33. The motor-driven propulsion device comprises a number of revolutions detecting means 34 to detect the number of revolutions of the motor 31; a feed current detecting means 35 to detect a value of a feed current to the motor 31; and a first current limiting means 36 to limit a feed current to the motor 31 by the current feed means 32 when the number of revolutions of the motor 31 is decreased or increased to a value lower or higher by a given value or more than a given value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric propulsion device for a ship in which an electric motor is used to drive a propeller (propeller) to rotate.

[0002]

2. Description of the Related Art Conventionally, in ships equipped with an electric propulsion device,
A drive current having a magnitude corresponding to the throttle opening (operation amount) is supplied from the battery to the motor to obtain a predetermined propulsive force. On the other hand, when turning, the motor is accelerated at the start of turning to orient the hull.

Some of the above electric propulsion devices are equipped with a power supply device for charging the battery (storage battery) with a solar battery. As shown in FIG. 10, this power supply device has a storage battery group 20 formed by connecting a plurality of storage batteries 20a of 6V or 12V connected in series and a plurality of solar batteries 21a connected in series and connected in parallel. The solar cell group 21 is formed in parallel with each other.

[0004]

However, in the above-mentioned conventional device, the load on the motor may increase during the turning to decrease the motor rotation speed, and the motor is locked in an extremely sharp turn. May be Furthermore, the number of revolutions of the motor may be drastically reduced due to the inclusion of foreign matter in the propeller. In any case, a large current flows through the motor, power consumption increases, and the motor, battery, etc. are easily damaged. The problem occurs.

Further, when the motor rotation speed sharply rises due to cavitation or the like, only battery power is consumed, and there is a problem that sufficient propulsive force cannot be obtained.

Further, in the above-mentioned conventional device, since the drive current of a magnitude corresponding to the throttle opening at a constant rate is supplied to the motor, when the throttle is suddenly opened, the motor rotational speed sharply increases, This is transmitted to the propeller, and there is a problem that the balance of the hull tends to be lost due to the rapid rotation of the propeller.

Further, as described above, in the method of connecting the series-connected bodies of the storage batteries 20a in parallel, when one storage battery in the series-connected body is deteriorated and the rating and performance are deteriorated, the series connection is made during charging. There is a problem that the other storage batteries in the connection body are not fully charged.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to avoid excessive increase in power consumption during turning, cavitation, etc., and damage to the motor, battery, etc. It is an object of the present invention to provide an electric propulsion device for a ship that can prevent the balance of the hull from being lost during sudden opening and can fully charge each storage battery during charging.

[0009]

According to the invention of claim 1, FIG.
In the electric propulsion device 1 for a ship, which is equipped with a motor 31 and a current supply means 32 for supplying a drive current to the motor from a storage battery 33, a rotation speed detection means 34 for detecting the rotation speed of the motor 31 as shown in FIG. And a supply current detecting means 35 for detecting a supply current value from the storage battery 33 to the motor.
And a first current limiting means 36 for limiting the current supplied to the motor 31 by the current supply means 32 when the rotation speed of the motor 31 decreases or increases by a predetermined value or more from the rotation speed according to the supply current. It is characterized by having and.

As a case where the rotation speed of the motor decreases more than the predetermined value, there is a case where the load in turning is serious or when foreign matter is caught, and when the rotation speed of the motor increases more than the predetermined value. , Cavitation, etc.

According to a second aspect of the present invention, as shown in FIG. 9, a ship provided with a motor 31 and a current supply means 32 for supplying the motor with a drive current according to the opening degree of a throttle lever 37 from a storage battery 33. In the electric propulsion device 1, the throttle opening degree detecting means 38 for detecting the throttle opening degree, the supply current detecting means 35 for detecting the supply current value from the storage battery to the motor, and the increasing rate of the throttle opening degree are predetermined values. When it is larger than the above, the rate of increasing the current supplied to the motor 31 by the current supply means 32 is limited for a predetermined time
It is characterized in that it is provided with a current limiting means 39.

According to a third aspect of the present invention, in an electric propulsion device for a ship, which includes a motor, a storage battery that supplies a drive current to the motor, and a solar cell that charges the storage battery, the solar cell and the solar cell are used for charging. It is characterized in that a plurality of power supply circuits each of which is connected in parallel with a plurality of possible storage battery groups connected in parallel are connected in series.

[0013]

According to the electric propulsion device 1 for a ship of the present invention, the rotation speed of the motor 31 is detected by the rotation speed detecting means 34, and the current supplied from the storage battery 33 to the motor 31 is supplied by the supply current detecting means 35. The value is detected. When the detected motor rotation speed increases or decreases by a predetermined value or more from the rotation speed according to the supply current, the first current limiting means 3
6 limits the supply current to the motor.

As described above, when the number of rotations of the motor does not correspond to the value of the current supplied to the motor, the current supplied to the motor is limited. Therefore, when turning suddenly or when foreign matter is caught in the propeller. Therefore, it is possible to prevent a large current from flowing through the motor when the motor rotation speed decreases by a predetermined value or more.
Further, when the motor speed increases due to cavitation, it is possible to avoid the problem that sufficient propulsive force cannot be obtained by only consuming the battery.

According to the electric propulsion device 1 for a marine vessel of the second aspect of the present invention, the throttle opening degree detecting means 38 detects the throttle opening degree, and the supply current detecting means 35 detects the storage battery 3.
The current value supplied from 3 to the motor 31 is detected. When the increasing speed of the throttle opening is larger than a predetermined value, the second current limiting means 39 causes the motor 31 to move.
The rate of increase of the current value supplied to is limited for a predetermined time.

As described above, when the throttle is suddenly operated, the value of the current supplied to the motor is gradually increased for a predetermined time. Therefore, the throttle is rapidly opened and the rotation of the propeller is rapidly increased. Can be avoided and the hull can be prevented from losing its balance.

According to the electric propulsion device for a marine vessel of a third aspect of the invention, since a plurality of power supply circuits in which a solar cell and a plurality of storage battery groups connected in parallel are connected in parallel are connected in series,
Even when there is a deteriorated storage battery, the remaining storage batteries can be fully charged.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 7 are views for explaining an electric propulsion device for a ship according to an embodiment of the present invention, FIG. 1 is a diagram showing a configuration of the above-mentioned embodiment device, and FIG. 2 is a power supply device of the above-mentioned embodiment device. 3 is a flow chart for explaining the operation of the above-mentioned embodiment apparatus, FIG. 5 is a diagram showing characteristics of motor output with respect to the throttle opening of the above-mentioned embodiment apparatus, and FIGS. It is the top view and side view of the solar boat provided with the device of this example.

In the figure, reference numeral 41 denotes a solar boat, and a rudder 45 is provided in front of a steering seat 42 of the boat 41.
Steering 4 connected with a wire cable (not shown)
6, an instrument panel 47 including a battery fuel gauge (not shown) and the like, and a throttle lever 49 connected to the CPU 3 described later are attached. Incidentally, reference numeral 50 is a wave back to prevent intrusion of seawater into the steering seat 42.

The solar boat 41 is equipped with an electric propulsion device 1, which is a power supply device (storage battery) 2
And a motor driver (current supply means) 4 for supplying a drive current from the power supply device 2 to a motor 5 for driving the propeller 52, and a CPU 3 for controlling the motor driver 4.

The CPU 3 includes a voltmeter 6 for detecting the power supply voltage of the power supply device 2, a throttle sensor 7 functioning as a throttle opening detecting means for detecting the opening of the throttle lever 49, and a rudder (not shown). Angle sensor 8 that detects the angle of the motor 5, an ammeter 9 that functions as a supply current detection unit that detects the power supply current supplied to the motor 5, and a rotation speed detection unit that detects the rotation speed of the motor 5. The rotation speed sensor 10 is connected to the CPU
Reference numeral 3 controls the motor driver 4 based on the detection signals of these measuring instruments and sensors.

Further, the CPU 3 stores a throttle opening-motor output map shown in FIG.
U3 controls the supply current based on the throttle opening. In the figure, characteristic lines A and A'represent the values of the throttle opening and time, the motor output and time when the amount of change (open speed) per unit time of the throttle opening is larger than a predetermined value, that is, during sudden acceleration. It shows the relationship. That is, when the throttle is suddenly opened, the increase amount of the motor current is limited and the increase amount of the motor output is set to be small until the time t1 when the opening becomes the predetermined value a. After the time t1, the motor output is set according to the throttle opening.

Further, the characteristic line B shows the relationship between the throttle opening and the motor output and the time when the throttle opening speed is below a predetermined value. That is, in a normal throttle operation, the motor output is increased in proportion to the throttle opening.

As shown in FIG. 2, the power supply device 2 includes power supply circuits P1 to P3 connected in series with each other and a cooling fan 11.

The power supply circuits P1 to P3 absorb the solar cells S1 to S6, which are power generators, the storage batteries B1 to B6 charged with the generated electric power, and changes in power generation characteristics of the solar cells due to sunshine conditions and the like. Capacitors C1 to C3, and charging regulators REG1 to REG3 that control the generated voltage and current values to values according to the charging characteristics of the storage battery.
It has and. It should be noted that the fan 11 uses the regulators REG1 to REG3 to control the storage batteries B1 to B1.
The operation is controlled based on the heat generation state due to the charging of No. 6.

Then, the solar cells S1 and S4, the storage batteries B1 and B4, the capacitor C1, and the regulator RE.
G1 is connected in parallel to form the power supply circuit P1.

Similarly, the above-mentioned solar cells S2 and S5 are also provided.
, The storage batteries B2, B5, the capacitor C2, and the regulator REG2 are connected in parallel, and the power supply circuit P2
In addition, the solar cells S3 and S6 and the storage batteries B3 and B
6, the capacitor C3, and the regulator REG3 are connected in parallel to form the power supply circuit P3. The capacitors C1 to C3 may be provided on the output side of the regulators REG1 to REG3.

Next, referring to FIG. 3, the motor output control operation at the time of normal operation such as the straight line running of the above ship will be described. First, when the throttle opening (Thθ)> 0 is detected by the throttle sensor 7, based on the characteristic curve B in FIG. 5, the motor output (output DU) corresponding to the opening is output.
TY) is set (steps S1 and S2).

Next, the load state of the motor 5 is judged based on the detection values of the ammeter 9 and the rotation speed sensor 10, and the load is a predetermined value, that is, the motor current and the motor rotation speed. If is the set value, the process returns to step S1 (step S3).

When it is determined that the load is small,
That is, when the motor current is smaller than the set value and the motor speed is larger than the set value, the set value of the motor output is decreased (step S4), and the process returns to step S3.

Further, when it is judged that the load on the motor 5 is large, that is, when the motor current is larger than the set value and the motor rotation speed is smaller than the set value, whether the load has suddenly increased from the increase rate of the load. When it is determined whether or not the load is not rapidly increased, the set value of the motor output is increased (steps S5 and S6), and the process returns to step S3.

When a sudden increase in the load is detected,
The current supply to the motor 5 is stopped (step S
5, S7). Then, when the throttle opening Thθ = 0 is detected, the process returns to step S1 (step S1).
8).

Next, the motor output control operation when the ship is turning will be described with reference to FIG. Currently, normal operation control is being performed (step S9), and it is determined that the motor rotation speed is faster than the set value (step S10).
When it is determined that the steering angle is larger than the predetermined value (step S11), a flag for setting that the boat is turning is set (steps S12 and S13).

The normal operation control described above means that the increasing speed of the throttle opening is less than a predetermined value, and therefore the motor output corresponding to the throttle opening is set based on the characteristic curve B of FIG. , The operation mode in which the current supplied to the motor 5 is controlled.

When the motor rotation speed is less than or equal to the predetermined value in step S10, or when the steering angle is less than or equal to the predetermined value in step S11 and the flag is reset (step S14), the process returns to step S9.

When it is determined that the load on the motor 5 is larger than the detected values of the ammeter 9 and the rotation speed sensor 10, the set value of the motor output is decreased (steps S14 and S15). If it is determined that the load is small, the set value of the motor output is increased (step S16) and the process returns to step S11. Here, the large load means that the motor current is larger or the engine speed is smaller than the planned output value obtained by the calculation of the control unit. The small load means that the motor current is equal to or lower than the predetermined value or the rotation speed is equal to or higher than the predetermined value.

Thus, when the load is small, the motor 5
Since the motor output is reduced by reducing the current supplied to the motor (steps S3 and S4), it is possible to avoid inappropriate motor rotation increase and battery current consumption due to cavitation.

When a sudden increase in the load on the motor 5 is detected, the motor output is stopped (step S
5, S7), it is possible to avoid damage to the motor 5 or the like when the load of the motor 5 suddenly increases due to the inclusion of foreign matter into the propeller.

Then, the load of the motor 5 is detected based on the motor current and the motor rotation speed, and the motor output is set based on the load (step S1).
4, S15), when the motor rotation speed is different from the rotation speed according to the supplied current, that is, when the motor rotation speed decreases during turning, or when the motor locks during sudden turning,
It is possible to avoid an increase in power consumption by reducing the current supplied to the motor 5 and avoid damage to the motor 5 and the like.

If the load on the motor 5 is small in steps S3 and S4, the current is continuously supplied to the motor while it is being reduced, and the load on the motor 5 is also reduced in step S14. When the supply current is stopped, the response of the rising of the motor rotation when the current is re-supplied decreases and the inrush current when the motor restarts. This is to prevent the increase of

Further, in the present embodiment, when the increasing speed of the throttle opening is larger than a predetermined value due to sudden acceleration or the like, the increasing speed of the current supplied to the motor 5 is limited for a predetermined time. It is possible to prevent the hull from losing its balance when the throttle is suddenly opened.

Here, in order to prevent the propeller from excessively rotating when the throttle is accidentally opened while the propeller is in the air, such as during maintenance work on land, a predetermined amount of current is supplied. Nevertheless, when a rotation speed higher than a predetermined value is detected, it may be determined that the engine is in a no-load state or a light-load state and the output may be stopped.

Further, the solar cells S1 and S6 and the storage battery B1,
B4 is connected in parallel to form a power supply circuit P1, and the power supply circuit P1 and a plurality of similarly formed power supply circuits P2 and P3 are connected in series to form the power supply device 2. Therefore, for example, the storage battery B1 The remaining storage batteries B2 to B6 can be fully charged even when the storage battery deteriorates, and the performance of each storage battery can be fully utilized regardless of the variation in the rated capacity of each storage battery and the deterioration state, and the state of charge of the storage battery decreases. You can avoid that.

Further, the charging regulators REG1 to REG
Since the solar cells S1 to S6 have the power generation characteristics of low current and high voltage, it is possible to prevent the parts from being damaged by exceeding the charging voltage of the storage batteries B1 to B6.

Since the capacitors C1 to C3 are provided, the electric power generated by the solar cells S1 to S6 can be once charged. Therefore, when a large current is discharged from the storage batteries B1 to B6 due to load fluctuation during discharging, it is possible to prevent the battery voltage from decreasing, and when a small current is discharged due to a light load during discharging, efficient and fast charging Therefore, effective use of electric power and stable electric power supply can be achieved.

[0046]

As described above, in the electric propulsion device for a marine vessel according to the invention of claim 1, the value of the current supplied to the motor is limited in accordance with the number of revolutions of the motor, so that it is possible to prevent a sudden turn or a propeller. There is an effect that it is possible to prevent a large current from flowing through the motor when foreign matter is caught in the motor, or to prevent the motor rotation from abnormally increasing during cavitation, thereby reducing the power consumption and protecting the motor and the battery.

In the electric propulsion device for a marine vessel according to the second aspect of the present invention, the rate of increase of the current supplied to the motor is limited when the throttle opening changes drastically. There is an effect that can prevent collapse.

In the electric propulsion device for a ship according to the third aspect of the present invention, since a plurality of power supply circuits in which a plurality of storage batteries are connected in parallel are connected in series, even if there is a storage battery having performance deterioration, the remaining normal condition is maintained. This has the effect of fully charging the storage battery.

[Brief description of drawings]

FIG. 1 is a block diagram of an electric propulsion device for a ship according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram showing a power supply device of the apparatus of the embodiment.

FIG. 3 is a flow chart for explaining the operation of the apparatus of the above embodiment.

FIG. 4 is a flow chart for explaining the operation of the apparatus of the above embodiment.

FIG. 5 is a characteristic diagram showing the relationship between the throttle opening, motor output and time of the above-described embodiment apparatus.

FIG. 6 is a plan view of a solar boat provided with the apparatus of the above embodiment.

FIG. 7 is a side view of a solar boat equipped with the apparatus of the embodiment.

FIG. 8 is a diagram corresponding to claims of the invention of claim 1;

FIG. 9 is a claim correspondence diagram of the invention of claim 2;

FIG. 10 is a circuit diagram showing a power supply device of a conventional electric propulsion device.

[Explanation of symbols]

 1 Electric Propulsion Device 2 Power Supply Device 17 Solar Battery 19 Power Supply Circuit 31 Motor 32 Current Supply Means 33 Storage Battery 34 Rotation Speed Detection Means 35 Supply Current Detection Means 36 First Current Limiting Means 38 Throttle Opening Detection Means 39 Second Current Limiting Means

Claims (3)

[Claims] 1. An electric propulsion device for a ship, comprising: a motor; and a current supply means for supplying a drive current to the motor from a storage battery. A rotation speed detection means for detecting the rotation speed of the motor; Supply current detecting means for detecting the supply current value to the motor, and the supply current to the motor by the current supply means when the rotation speed of the motor decreases or increases by more than a predetermined value from the rotation speed according to the supply current. An electric propulsion device for a marine vessel, comprising: 2. An electric propulsion device for a ship, comprising: a motor; and a current supply means for supplying a driving current from a storage battery to the motor according to the opening degree of a throttle lever. Means, a supply current detecting means for detecting a supply current value from the storage battery to the motor, and an increasing speed of the supply current to the motor by the current supplying means when the increasing speed of the throttle opening is larger than a predetermined value. An electric propulsion device for a ship, comprising: a second current limiting means for limiting only a time. 3. An electric propulsion device for a ship, comprising: a motor, a storage battery for supplying a drive current to the motor, and a solar cell for charging the storage battery, wherein the solar cell and a plurality of parallel rechargeable solar cells. An electric propulsion device for a ship, comprising a plurality of power supply circuits connected in parallel with a group of connected storage batteries connected in series.