JP3475445B2 - Exercise load device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exercise load device which is an exercise machine for improving physical strength, and more particularly to an exercise load device which obtains a load by an eddy current brake.

[0002]

2. Description of the Related Art An exercise load device is called a bicycle ergometer. This not only performs a pedaling motion, but also applies a load torque to the pedaling operation, and an eddy current brake is generally used as the load torque. This eddy current brake is composed of a rotating disk that is driven to rotate by the operation of depressing a pedal and an exciting coil that faces the rotating disk. By applying an eddy current to the rotating rotating disk, braking is applied. In order to obtain the above load torque and to form the load by electromagnetic braking, mechanical wear and the change in the braking force due to this wear are compared with the case where the load is obtained by mechanical braking such as friction. In addition, stable characteristics can be obtained over a long period of time, and the braking force can be easily adjusted.

[0003]

By the way, in the exercise load device, the amount of exercise performed by the user is calculated based on the load torque (braking torque).
As shown in FIG. 7, it changes depending on the rotation speed of the rotating disk. That is, the load torque is substantially constant in the saturation region B, but the load torque is greatly reduced in the unsaturated region B where the rotation speed is low.
Even if is increased, it becomes impossible to obtain the required load torque. In this case, it is difficult to accurately calculate the amount of exercise. Therefore, in the past, the amount of exercise was calculated based on the value of the load torque within the actual use range. It was required to use at a certain number of rotations, but depending on the usage situation, this low rotation speed range may become a, and at this time the calculated momentum becomes larger than the actual momentum. .

The present invention has been made in view of the above points, and an object thereof is to provide an exercise load device capable of accurately calculating the amount of exercise regardless of the number of revolutions. is there.

[0005]

SUMMARY OF THE INVENTION The present invention, however, comprises an eddy current brake comprising a rotating disk which is rotationally driven by human power and an exciting coil which applies braking to the rotating disk by eddy current. in exercise device to apply the load to be targeted by the eddy current brake, the eddy
The current brake has an exciting coil around the axis of the rotating disc.
In addition to being arranged, there is a connection to the exciting coil.
Rotating disk that controls magnetic field by exciting coil to control magnetic field
It is characterized by the fact that it has a control circuit for rotating it around the axis .

[0006]

According to the present invention , the relative rotation speed between the exciting coil and the rotary disk becomes a preferable rotation speed regardless of the actual rotation speed of the rotary disk, so that the load torque is also stable. The momentum calculated based on the load torque becomes accurate.

[0007]

[Embodiment] The form of the exercise load device may be any form as long as it can obtain a load torque by an eddy current brake, but here, as shown in FIGS. 2 and 3, the case of a bicycle ergometer is shown. ing. This exercise load device
A pair of struts 2 and 3 both of which can be expanded and contracted and whose length is variable are erected from the base 1, a handle 20 and a controller 8 are provided at the upper end of the stanchion 2, and a saddle 30 is provided at the upper end of the stanchion 3. It has been provided. A gear box 4 is arranged in a portion of the columns 2 and 3 covered with the cover 9 on the side of the leg frame 1 by fixing the plate to the columns 2 and 3.

The gear box 4 here has a worm wheel 40 and a worm shaft 41 meshing with the worm wheel 40, and the worm wheel 40 is provided with a pedal 50 via a free wheel (not shown). It is connected to the crankshaft 5. A load shaft 44 is connected to the lower end of the worm shaft 41 extending below the gear box 4, and a rotary disc 60 is attached to the load shaft 44. The rotating disk 60 is formed of an electric conductor such as copper, and the eddy current brake 6 is configured with the exciting coil 61 that positions the rotating disk 60 in the gap. In the figure, 17 is a leg with a height adjusting function provided on the lower surface of the base 1, and 19 is a roller provided at the end of the base 1.

When the pedal 50 is depressed while sitting on the saddle 30, only one-direction rotation is transmitted from the crankshaft 5 to the worm shaft 41 via the free wheel and the worm wheel 40 by increasing the speed. The load shaft 44 and the rotating disk 60 rotate together with the shaft 41. Since the rotating disk 60 is placed in the magnetic field generated by the exciting coil 61, it produces an eddy current and is electromagnetically damped by the eddy current and the magnetic field. This braking force is
The load is applied to the operation of stepping on the pedal 50, and changes depending on the current supplied to the exciting coil 61 and the rotation speed of the rotating disk 60.

The controller 8 includes the exciting coil 6
1 controls the coil current to flow, calculates momentum, displays various states and calculation results on the operation display panel on the upper surface shown in FIG. 4, and mainly includes a control circuit 80 including a microcomputer. As shown in 5, operation display
While the switches 81 on the panel are connected,
The display unit 8 on the operation display panel via the display drive circuit 82.
9 is connected, the excitation coil 61 is connected via the power control circuit 87, and the rotation sensor 85 for detecting the number of rotations of the rotating disk 60 is connected via the rotation detection circuit 86, so that the user's ear A pulse sensor 84 and a pulse wave detection circuit 88 are connected to the control circuit 80 for measuring the user's pulse rate by sending the measurement value to the control circuit 80.

In the controller 8, any one of physical strength measurement, load training, and pulse training is selected as the exercise mode, and the sex of the user,
If conditions such as age, weight, desired load value, time, pulse, pitch, etc. are set, the coil current supplied to the exciting coil 61 is controlled so that a required load is generated and detected by the pulse sensor 84. The user's pulse, the crank rotation pitch obtained by the rotation speed sensor 85, the load output value at that time calculated based on the rotation speed obtained by the rotation sensor 85 and the coil current,
The exercise time, the running distance obtained by converting the cumulative exercise amount calculated from the load value and the exercise time, and the consumed calories obtained by converting the cumulative exercise amount are displayed on the display unit 89, and the load output value is also displayed. According to the target load value determined by the set and selected motion mode, the input load value, and the like, the coil current supplied to the exciting coil 61 is controlled to adjust the load torque.

At this time, the controller 8 is, as shown in FIG. 6 , the actual load maximum output capacity which is the maximum value of the actual load (load output value) at that time calculated based on the rotation speed and the coil current. When the load output value B is higher than the target load value A, the value B is compared with the target load value A at the rotational speed determined by the set / selected motion mode, the input load value, etc. Calculate the coil current value a that can obtain the load torque at which the actual load maximum output capacity value B at the rotation speed matches the target load value A, and perform the current control with the coil current I as the value a. When the actual load maximum output capacity value B does not exceed the target load value A, the coil current I
The maximum value b (a <b) peculiar to the load is selected as.

Also, in calculating the amount of exercise performed in parallel, the actual load maximum output capability value B as shown in FIG.
To compare with the target load value A and the actual than the target load value A
When the load maximum output capacity value B is higher than the target load value A, the target load value A is adopted as the value of the load output that is the basis of the exercise amount calculation, and when the actual load maximum output capacity value B is not higher than the target load value A. Uses the actual load maximum output capability value B as the value of the load output that is the basis of the exercise amount calculation.

As a result, as shown in FIG. 7, the actual load maximum output exceeds the target load value (for example, A1, A2, A3, A4).
In the rotational speed range where the force capability value B is small (the crank rotational speed is about 40 rpm or less at 240 Watt, the crank rotational speed is about 35 rpm or less at 120 Watt),
Since the actual load maximum output capacity value B is used instead of the target load value to calculate the amount of exercise such as mileage and calories burned, compared to the conventional one using only the target load value,
It is possible to accurately calculate the amount of exercise.

Which of the above values a and b is set as the coil current I, and the load value which is the basis of the momentum calculation,
To determine whether to take the target load value A or the actual load maximum output capacity value B that is the load torque that is actually occurring, see FIG.
As shown in FIG. 10, the rotational speed Ro at the boundary between the saturated region (b) and the unsaturated region (a) ( about 4 in crank rotational speed in the illustrated example).
0 rpm) may be performed depending on whether or not the rotational speed R at that time is higher. In this case, the momentum can be accurately calculated, and the determination can be made only by detecting the number of revolutions. Therefore, the control becomes simpler than that in the above-described embodiment.

In the above example , it is premised that the load torque of the eddy current brake 6 becomes small when the rotation speed of the rotary disk 60 is low, and this point can be corrected in calculating the momentum. It is, but not be less load torque of the eddy current brake 6 even when the rotational speed is low by the following manner, without performing the correction to be able to calculate an accurate momentum <br / > Can.

That is, as shown in FIG. 11, as the eddy current brake 6, a plurality of exciting coils 61 are arranged around the rotating disk 60 at substantially equal intervals, and the control circuit 80 excites them through the power control circuit 87. In controlling the coil current I flowing through the coil 61, the magnetic field generated by the exciting coil 61 can be rotated around the axis of the rotating disk 60 by sequentially switching the exciting coil 61 to be excited. Further, when the magnetic field is rotated, the control circuit 80 takes in the rotation speed of the rotating disk 60 through the rotation sensor 85 and the rotation detection circuit 86, and with reference to this rotation speed, the order of the exciting coils 61 to be excited and the The direction and number of rotations of the magnetic field can be controlled by the speed of switching.

There are various conceivable ways of setting the rotating direction and the rotating speed of the magnetic field. In FIG. 13, the rotating disk 6 is rotated in the direction opposite to the rotating direction of the rotating disk 60.
The figure shows the case where the magnetic field is rotated at a rotational speed almost the same as the rotational speed of 0. Rotating disc 60 clockwise 320 rp
320 rpm counterclockwise when rotating at m
In order to rotate at 60 rpm, the relative rotation speed between the rotating disk 60 and the magnetic field is 640 rp, which is twice the rotating speed of the rotating disk 60.
m (40 rpm in crank rotation speed).
In this case, the range of the saturation range b where the load torque is almost constant becomes small, but since the saturation range b shifts to the side where the rotation speed is low, it is necessary to secure the predetermined load torque even in the low rotation speed range. You can

If the rotation speed of the magnetic field is fixed at 320 rpm and the magnetic field is rotated in the direction opposite to the rotation direction of the rotating disk 60, the relative rotation speed between the rotating disk 60 and the magnetic field is the rotating disk 60. Since 320 rpm is added to the rotation speed, the load torque curve is shifted to the low rotation side as a whole, as shown in FIG. 14, and the saturation range b in which the load torque is almost constant is shown in FIG.
Compared with the case shown in (1), the crank rotation speed starts from 20 rpm lower.

FIG. 15 shows a case where the rotational speed of the magnetic field is controlled so that the relative rotational speed between the rotating disk 60 and the magnetic field is constant (here, 960 rpm, crank rotational speed is 60 rpm). The rotation speed of the rotating disk 60 is 3
At 20 rpm, the magnetic field is reversed at 640 rpm
The rotation speed of the rotating disk 60 is 1280 rp.
When it is m, the magnetic field is rotated in the same direction at 320 rpm, and in this case, a constant load torque in the saturation region can be obtained in the entire rotational speed region of the rotating disk 60. It is possible to deal with the gradual decrease of the load torque in the supersaturation region C in FIG. 17. Further, in order to widen the range of the saturation region where the constant load torque can be obtained, normally, the load rotation speed and the speed increasing ratio, Since the load size radius, the electromagnet magnetic pole size, and the like influence each other, design restrictions are extremely large, but such restrictions can be reduced.

In the above example, the magnitude of the load torque is adjusted by the value of the coil current I. However, when the coil current I in FIG. 17 is 0.8 A, the rotational speed of the rotary disk 60 and the load torque. Take the correlation data between
Based on this data, the coil current I is always kept constant, and the relative rotational speed S between the rotating disk 60 and the magnetic field is controlled to determine the magnitude of the load torque as shown in FIG. You can also The rotational speed of the magnetic field is controlled so that the relative rotational speed S is 960 rpm over the entire rotational speed of the rotating disk 60, or the relative rotational speed S is over the entire area.
The magnitude of the load torque is determined by controlling the number of revolutions of the magnetic field so that the torque becomes 320 rpm.

The specific examples of the control of the rotating direction and the rotating speed of the magnetic field are not limited to the above four examples, and some combinations may be controlled. Further, although the rotating disk 60 is made of copper here, the rotating disk 60 is not limited to this and may be any disk that can realize the same function.

[0023]

As described above , according to the present invention, the rotating disk is
Eddy current blur with multiple excitation coils placed around the disk axis.
Is used and the order of energizing the excitation coil
Control the magnetic field generated by the exciting coil around the axis of the rotating disk
Excitation coil because it has a control circuit to rotate
The relative rotation speed between the rotating disk and the
Regardless of the speed of rotation
The load torque is stable, and
Accurate momentum calculated based on Q.

[0024]

[Brief description of drawings]

FIG. 1 is a flowchart showing an operation in an example .

FIG. 2 is a cross-sectional view showing the entire exercise load device.

FIG. 3 is a perspective view of the above.

FIG. 4 is a plan view of the above controller.

FIG. 5 is a block circuit diagram of the above.

FIG. 6 is a flowchart regarding eddy current brake control of the same.

FIG. 7 is a characteristic diagram of rotation speed-load torque according to the above.

FIG. 8 is a flowchart showing an operation in another embodiment.

FIG. 9 is a flowchart regarding eddy current brake control in the same as above.

FIG. 10 is a characteristic diagram of rotation speed-load torque according to the above.

FIG. 11 is a block circuit diagram in another embodiment.

FIG. 12 is a flowchart regarding eddy current brake control of the above.

FIG. 13 is a characteristic diagram of rotation speed-load torque in an example of control according to the above.

FIG. 14 is a characteristic diagram of rotation speed-load torque in another example of the control according to the above.

FIG. 15 is a characteristic diagram of rotation speed-load torque in still another example of the control according to the above.

FIG. 16 is a rotational speed-load torque characteristic diagram according to another example of the control according to the above.

FIG. 17 is a characteristic diagram of rotation speed-load torque in a normal eddy current brake.

[Explanation of symbols]

6 Eddy current brake 60 rotating disc 61 Excitation coil 80 control circuit

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-3-247358 (JP, A) JP-A-4-246378 (JP, A) JP-A-3-118084 (JP, A) JP-A-61- 238261 (JP, A) JP 3-159663 (JP, A) JP 2-45073 (JP, A) JP 3-195569 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A63B 22/06 A63B 24/00 A63B 69/16 H02K 49/02 F16D 63/00

Claims (5)

(57) [Claims] 1. An eddy current brake comprising a rotating disk which is rotationally driven by human power and an exciting coil for braking the rotating disk by an eddy current, and a target load is applied by the eddy current braking. In the exercise load device, the eddy current brake is
It is said that multiple exciting coils are arranged around the axis.
The energizing coil is controlled by controlling the energizing sequence to the exciting coil.
Control circuit to rotate the magnetic field around the axis of the rotating disk
An exercise load device characterized by being provided . 2. The control circuit controls the direction of rotation of the rotary disk.
A magnetic field is applied in the opposite direction at a speed proportional to the rotation speed of the rotating disk.
The exercise load device according to claim 1, wherein the exercise load device is rotated . 3. The control circuit controls the direction of rotation of the rotary disk.
To rotate the magnetic field in the opposite direction at a constant speed
The exercise load device according to claim 1, which is characterized in that . 4. The control circuit responds to the rotation speed of the rotating disk.
The relative rotation speed between the rotating disk and the magnetic field is
It is characterized by rotating the magnetic field at
The exercise load device according to claim 1 . 5. The control circuit changes the load torque relative to each other.
5. The method according to claim 4, wherein the number of turns is changed.
The exercise load device described .