JP6470068B2 - Ventilator - Google Patents

Description

  The present invention is an artificial respiration apparatus that supplies air into the lungs of a living body in synchronization with the natural breathing of the living body, and in particular, a type in which gas is continuously compressed by centrifugal force due to rotation of an impeller The present invention relates to a ventilator that supplies oxygen to the lungs of a patient.

  2. Description of the Related Art Conventionally, as an artificial respiration apparatus, a treatment apparatus including a blower that supplies air or a gas suitable for respiration to a patient-side connection device such as a mask by an air supply conduit is known (for example, Patent Document 1 and Patent). Reference 2).

JP 2009-537735 A (refer to paragraph 0003, FIG. 1, FIG. 5b in particular) Japanese Patent No. 3775118 (refer to FIGS. 1 and 9 in particular) Japanese Utility Model Publication No.57-1132

However, the conventional blower motor described above has a structure in which dynamic pressure is generated between the outer peripheral surface of the shaft and the inner peripheral surface of the sleeve due to rotation of the shaft, resulting in bearing rigidity. If the shaft and the sleeve are relatively swung in the direction in which the rotating shaft of the rotating body tilts due to a disturbance or the like, the contact friction torque of the dynamic pressure gas bearing increases and adhesion of the dynamic pressure gas bearing Seizure may cause galling, which may cause fatal damage to the dynamic pressure gas bearing.
Therefore, in order to keep the rotation safely, the sliding bearing, the rolling bearing provided outside the sliding bearing, and the rolling bearing until the rotational torque transmitted from the sliding bearing to the rolling bearing becomes equal to or higher than the reference rotational torque. A device including a rotation restricting means for restricting rotation is known (for example, Patent Document 3).

  However, since the conventional rotation restricting means described above has a contact structure in which the elastic member or the connecting member attached to the outer annular member is in contact with the inner annular member, the transmitted rotational torque exceeds the reference rotational torque. Even when rotating with a rolling bearing, the elastic member comes into contact with each rotation and the elastic member breaks, and when the transmitted rotational torque exceeds the reference rotational torque, the connecting member breaks and rotates. There was a problem that the structure of the regulating means itself was damaged.

  Therefore, the present invention solves the problems of the prior art as described above. That is, the object of the present invention is to cause the motor shaft and the sleeve to oscillate and come into contact with each other by applying a disturbance to the motor. Prevents galling due to adhesion and seizure of the dynamic pressure gas bearing when the contact friction torque of the dynamic pressure gas bearing increases, and swings the total rotational speed of the rotating body against the motor case body without destroying the structure It is intended to provide an artificial respiration apparatus that supplies air to the lungs of a living body in a substantially constant manner before and after the occurrence of.

According to the first aspect of the present invention, a pressurizing unit that sucks and pressurizes air from a suction port, an intake passage that supplies air pressurized by the pressurizing unit to the mask, and discharges air from the mask. In the artificial respiration apparatus provided with an exhalation flow path, the pressurizing means includes an impeller that sucks and compresses the air, and a motor that rotates the impeller, and the motor includes a motor case body, A motor shaft that is rotatably supported with respect to the motor case body, a drive coil that is disposed in the motor case body and generates a magnetic force when energized, and rotates using the attractive / repulsive force of the drive coil A rotor magnet that generates force, a dynamic pressure gas bearing having a sleeve that covers the periphery of the motor shaft, an auxiliary bearing that is arranged in series with the dynamic pressure gas bearing and rotatably supports the motor shaft, and the auxiliary Parallel arrangement with bearing A non-contact type detent torque generating mechanism that suppresses rotation of the auxiliary bearing, and Ta represents the viscous friction torque during rotation of the dynamic pressure gas bearing in a state where the motor shaft and the sleeve are separated from each other. Due to the rocking contact between the shaft and the sleeve, the contact friction torque that may damage the dynamic pressure gas bearing is Tka, the rotational friction torque of the auxiliary bearing is Tb, and the non-contact detent torque generating mechanism When the maximum torque generated in a state in which the rotation of the auxiliary bearing is suppressed is Tdmax,
(Ta + Tka)> (Tb + Tdmax)> (Ta)
By setting the value of Tdmax so as to satisfy, the above-described problem is solved.

  According to the second aspect of the present invention, in addition to the configuration of the artificial respiration apparatus described in the first aspect, the non-contact type detent torque generating mechanism rotates integrally with the motor shaft and has a pole in the circumferential direction. The above-described problem can be further solved by including a rotating side magnet that changes and a fixed side magnet that is disposed opposite to the outer side of the rotating side magnet or in the axial direction of the rotating side magnet and whose pole changes in the circumferential direction. To do.

  In addition to the configuration of the artificial respiration apparatus described in claim 1 or 2, the invention according to claim 3 further solves the above-described problem by the auxiliary bearing being a rolling bearing. is there.

  In the invention according to claim 4, in addition to the configuration of the artificial respiration apparatus according to any one of claims 1 to 3, rotation detection means for detecting the rotation of the auxiliary bearing is installed, The controller that controls the rotation of the motor receives the rotation detection signal from the rotation detection means, thereby further solving the above-described problem.

In the invention according to claim 5 , in addition to the configuration of the artificial respiration apparatus described in claim 4, when the control unit receives the rotation detection signal, the rotation integrated time of the auxiliary bearing is measured. By starting, the above-described problems are further solved.

In the invention according to claim 6 , in addition to the configuration of the artificial respiration apparatus described in claim 4 or claim 5, the control unit counts the number of times the rotation detection signal is received, and thus the above-described configuration is provided. The problem is further solved.

According to the seventh aspect of the present invention, in addition to the configuration of the artificial respiration apparatus according to any one of the fourth to sixth aspects, the control unit receives the rotation detection signal and then performs the rotation. By decreasing the rotation speed of the motor until no detection signal is received, increasing the rotation speed of the motor after the rotation detection signal is not received, and returning to a state in which the rotation of the auxiliary bearing is suppressed. It solves the problems that have been solved.

  The artificial respiration apparatus of the present invention includes a pressurizing unit that sucks and pressurizes air from an inlet, an intake passage that supplies air pressurized by the pressurizing unit to the mask, and discharges air from the mask. By providing the exhalation flow path, not only can air be forcibly supplied to the lungs of the living body and air can be discharged from the lungs, but also the following specific effects can be achieved.

According to the artificial respirator of the present invention, the pressurizing means has an impeller that sucks and compresses air and a motor that rotates the impeller, and the motor includes a motor case body, A motor shaft that is rotatably supported with respect to the motor case body, a drive coil that is disposed in the motor case body and generates a magnetic force when energized, and a rotational force that utilizes attraction / repulsive force of the drive coil A dynamic pressure gas bearing having a sleeve covering the periphery of the motor shaft, an auxiliary bearing which is arranged in series with the dynamic pressure gas bearing and rotatably supports the motor shaft, and is arranged in parallel with the auxiliary bearing. A non-contact detent torque generating mechanism that suppresses the rotation of the auxiliary bearing, and Ta represents the viscous friction torque during rotation of the dynamic pressure gas bearing with the motor shaft and sleeve separated from each other, and the motor shaft and The contact friction torque that might damage the dynamic pressure gas bearing is Tka, the rotational friction torque of the auxiliary bearing is Tb, and the rotation of the auxiliary bearing is suppressed by the non-contact detent torque generation mechanism. When the maximum torque generated in the state is Tdmax,
(Ta + Tka)> (Tb + Tdmax)> (Ta)
Since the Tdmax value is set so that the motor shaft and the sleeve are in oscillating contact due to a disturbance applied to the motor, adhesion, seizure, etc. Since the auxiliary bearing starts rotating before galling occurs, the total number of rotations of the rotating body with respect to the motor case body does not change before and after the occurrence of oscillating contact without causing fatal damage to the dynamic pressure gas bearing. The air can be stably supplied to the lungs of the living body while being substantially constant.
In other words, since the auxiliary bearing starts rotating when a disturbance is applied to the motor, a fatal situation in which the supply of air to the lungs of the living body is stopped can be avoided.
Furthermore, since the detent torque generating mechanism is a non-contact type, the rotation can be continued without destroying the structure of the detent torque generating mechanism even when the rotation of the auxiliary bearing is started.

According to the artificial respirator of the invention of claim 2, in addition to the effect of the invention of claim 1, the non-contact type detent torque generating mechanism rotates integrally with the motor shaft and is poled in the circumferential direction. The rotation side of the auxiliary bearing is provided with a rotation-side magnet that is replaced with a fixed-side magnet that is disposed opposite to the rotation-side magnet or in the axial direction of the rotation-side magnet and whose pole is changed in the circumferential direction. Before starting, the maximum attractive force acting between the rotating side magnet and the stationary side magnet becomes the maximum detent torque generated when the rotation of the auxiliary bearing is suppressed.
On the other hand, the detent torque when the auxiliary bearing is rotating changes in a sine wave shape according to the relative angle between the rotating side magnet and the fixed side magnet, and the torque hitting this apex becomes the maximum torque, while the auxiliary bearing When the auxiliary bearing rotates, no substantial loss occurs due to the detent torque.

  According to the artificial respiration apparatus of the invention of claim 3, in addition to the effect of the invention of claim 1 or claim 2, there is no rapid deterioration and galling is difficult to occur. The auxiliary bearing can be reliably and quickly started rotating before the sleeve comes into rocking contact and causes fatal damage to the dynamic pressure gas bearing.

  According to the artificial respiration apparatus of the invention according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, the rotation detecting means for detecting the rotation of the auxiliary bearing is provided. Then, the control unit that controls the rotation of the motor receives the rotation detection signal from the rotation detection means, so that even if the auxiliary bearing starts rotating, the auxiliary bearing is rotating in real time. Can be detected.

According to the ventilator of the invention according to the claims 5, in addition to the effects of the invention according to claim 4, the control unit measures a rotational integration time of the auxiliary bearing upon reception of the rotation detection signal Thus, the control unit can calculate and predict the life of the auxiliary bearing from the rotation accumulated time.
For example, the replacement of the motor and the auxiliary bearing can be promoted based on the life prediction.

According to the artificial respiration apparatus of the invention of claim 6, in addition to the effect of the invention of claim 4 or claim 5 , the control unit counts the number of times of receiving the rotation detection signal to assist Since the number of times rotation of the bearing is started is counted, the control unit can calculate and predict the life of the auxiliary bearing from the number of rotation start.
For example, the replacement of the motor and the auxiliary bearing can be promoted based on the life prediction.

According to the artificial respiration apparatus of the present invention related to claim 7, in addition to the effect exhibited by the invention according to any one of claims 4 to 6 , the control unit rotates after receiving the rotation detection signal. By reducing the rotation speed of the motor until no detection signal is received, the non-contact detent torque generating mechanism again suppresses the rotation of the auxiliary bearing, and the rotation of the motor after the rotation detection signal is not received. By increasing the number again, it is possible to restore the rotational state and the rotational speed before the motor shaft and the sleeve are in oscillating contact with each other, so that the life of the motor (bearing) can be made semi-permanent.

1 is a schematic block diagram showing an artificial respiration apparatus using a motor according to a first embodiment of the present invention. The perspective view which shows the blower using the motor which is 1st Example of this invention. FIG. 3A is a side sectional view taken along the line 3A-3A in FIG. 2 and shows rotation in a state where the motor shaft and the sleeve are separated from each other, and FIG. 3B is a line 3B- in FIG. The principal part side sectional view seen in 3B. (A) and (B) are sectional side views showing rotation when the sum of the contact friction torque and the viscous friction torque at the time of rotation becomes larger than the sum of the predetermined detent torque at the time of rotation suppression and the friction torque of the ball bearing. . The figure which shows the change of each rotation speed of the dynamic pressure gas bearing and ball bearing before and behind the rocking | fluctuation contact of a motor shaft and a sleeve. (A) is a figure which shows the relationship between the viscous friction torque at the time of rotation of a dynamic pressure gas bearing, the friction torque of a ball bearing, and rotation speed, (B) is the rotation speed of an impeller and the rotation speed in a dynamic pressure gas bearing. The figure which shows the relationship between the rotation speed in a ball bearing. The chart figure showing the 1st mode of an artificial respirator. The chart figure showing the 2nd mode of a respirator. The chart figure showing the 3rd mode of a respirator. The chart figure showing the 4th mode of a respirator. (A) (B) is a sectional side view showing a blower using a motor according to a second embodiment of the present invention.

The present invention includes a pressurizing unit that sucks and pressurizes air from an inlet, an intake passage that supplies air pressurized by the pressurizing unit to the mask, and an exhalation passage that discharges air from the mask. In the artificial respiration apparatus, the pressurizing means has an impeller that sucks and compresses air and a motor that rotates the impeller, and the motor is rotatable with respect to the motor case body and the motor case body. A motor shaft that is supported, a drive coil that is disposed in the motor case and generates a magnetic force when energized, a rotor magnet that generates a rotational force by using the attraction / repulsive force of the drive coil, and a motor shaft A hydrodynamic gas bearing having a sleeve covering the periphery, an auxiliary bearing which is arranged in series with the hydrodynamic gas bearing and rotatably supports the motor shaft, and a non-rotating bearing which is arranged in parallel with the auxiliary bearing to suppress the rotation of the auxiliary bearing. Contact detent A torque generating mechanism, Ta is the viscous friction torque during rotation of the hydrodynamic gas bearing with the motor shaft and the sleeve spaced apart from each other, and the hydrodynamic gas bearing becomes When the contact friction torque that may cause damage is Tka, the rotation friction torque of the auxiliary bearing is Tb, and the maximum torque generated in a state where the rotation of the auxiliary bearing is suppressed by the non-contact detent torque generation mechanism is Tdmax,
(Ta + Tka)> (Tb + Tdmax)> (Ta)
The value of Tdmax is set so that the motor shaft and the sleeve oscillate and the contact friction torque of the hydrodynamic gas bearing increases due to a disturbance applied to the motor. However, the total rotational speed of the rotating body with respect to the motor case body remains substantially constant before and after the occurrence of the oscillating contact so that air is stably supplied to the lungs of the living body and rotation of the auxiliary bearing is started. However, as long as the structure of the non-contact detent torque generating mechanism continues to rotate without being destroyed, any specific embodiment may be used.

For example, the motor may be a so-called sleeve rotation type in which the motor shaft does not rotate in the dynamic pressure gas bearing during normal rotation before the disturbance is applied, and the motor shaft does not rotate. A so-called rotating shaft type may be used.
The motor may be any motor that rotates at high speed, such as a brushless DC motor (brushless DC motor) or an AC motor (AC motor).
The auxiliary bearing may be another contact type bearing such as a rolling bearing such as a ball bearing, a sliding bearing that makes surface contact or line contact, and a pivot bearing that makes contact at substantially one point.

  The non-contact detent torque generating mechanism may be any non-contact type, such as a mechanism that generates detent torque using the magnetic force of a permanent magnet or a mechanism that generates detent torque using the magnetic force of an electromagnet. .

Below, the artificial respiration apparatus 100 using the motor M100 which is 1st Example of this invention is demonstrated based on FIG. 1 thru | or FIG.
Here, FIG. 1 is a schematic block diagram showing an artificial respiration apparatus 100 using the motor M100 according to the first embodiment of the present invention, and FIG. 2 uses the motor M100 according to the first embodiment of the present invention. FIG. 3A is a side sectional view taken along the line 3A-3A in FIG. 2 and shows rotation in a state where the motor shaft M120 and the sleeve M130 are separated from each other. 3 (B) is a cross-sectional side view of the main part viewed from reference numeral 3B-3B in FIG. 3 (A). FIGS. 4 (A) and 4 (B) are the same as FIG. 3 (A). Corresponding to FIGS. 3B and 3B, the viscous friction torque Ta during rotation of the dynamic pressure gas bearing and the motor shaft M100 and the sleeve M130 are brought into oscillating contact by some disturbance, thereby damaging the dynamic pressure gas bearing. The sum of the contact friction torque Tka that might be applied is The sum of the friction torque Tb of the rings M171 and M172 and the maximum torque Tdmax generated while the rotation of the ball bearings M171 and M172 as auxiliary bearings is suppressed by the non-contact detent torque generation mechanism M180 at the time of rotation suppression. FIG. 5 is a side sectional view showing rotation when the value, that is, (Ta + Tka)> (Tb + Tdmax), and FIG. 5 shows a hydrodynamic gas bearing and a ball bearing M171 before and after the rocking contact between the motor shaft M120 and the sleeve M130. FIG. 6A shows the relationship between the rotational viscous friction torque Ta of the hydrodynamic gas bearing and the friction torque Tb of the ball bearings M171 and M172 and the rotational speed. FIG. 6B shows the rotation speed N of the impeller W (motor), the rotation speed Na of the dynamic pressure gas bearing, and the ball base. FIG. 7 is a diagram showing the relationship with the rotational speed Nb in the rings M171 and M172, FIG. 7 is a chart showing the first mode of the ventilator 100, and FIG. 8 shows the second mode of the ventilator 100. FIG. 9 is a chart showing the third mode of the ventilator 100, and FIG. 10 is a chart showing the fourth mode of the ventilator 100.

As shown in FIG. 1, an artificial respiration apparatus 100 according to a first embodiment of the present invention includes a control unit 110, a display unit 120, a notification unit 130, and a pressurizing unit that sucks and pressurizes air from an inlet. , A breather flow path 150 for supplying air to the mask MK, and an expiratory flow path 160 for discharging air from the mask MK.
Among these, the control part 110 is comprised so that rotation of the motor M100 may be controlled via the drive circuit 111. FIG.
The controller 110 is also configured to receive a rotation detection signal from a ball bearing rotation detector M190 of the motor M100, which will be described in detail later.
The drive circuit 111 is configured, for example, to constitute an inverter circuit and convert a rotation instruction from the control unit 110 into a signal matched with the motor M100 and send a pulse signal as an example to the motor M100.

Further, the display unit 120 displays, in accordance with an instruction from the control unit 110, that the ball bearings M171 and M172, which will be described later, are rotating, and that the replacement time of the motor M100 and the ball bearings M171 and M172 is approaching. And so on.
The notification means 130 turns on the lamp or notifies the user that the ball bearings M171 and M172 are rotating and the replacement timing of the motor M100 and the ball bearings M171 and M172 according to an instruction from the control unit 110. It is configured to notify by sounding or the like.
It should be noted that a signal may be output from the control unit 110 to the outside such as the operation unit as necessary, and a multipurpose such as centralized management of a plurality of motors by inputting the external output signal to an external control device (not shown). You may use it.

The blower 140 is configured to generate both positive pressure and negative pressure at the same time as an example.
In the intake flow path 150, for example, an intake air port 151 that is an intake port, a filter 152, an oxygen port 153 that is an intake port, an oxygen blender 154, a pressure sensor 155, and an intake valve 156, is set up.

Among these, the intake air port 151 is configured to be connected to a supply valve provided in a cylinder filled with air, a hospital facility, or the like, and the air supplied from the intake air port 151 passes through the filter 152. To the downstream side of the flow path.
Similarly, the oxygen port 153 is configured to be connected to a supply valve provided in a cylinder filled with oxygen, a hospital facility, or the like.

The oxygen blender 154 is configured to mix the air supplied from the intake air port 151 and the oxygen supplied from the oxygen port 153 to freely set the oxygen concentration of the intake air.
The intake air mixed by the oxygen blender 154 is pressurized by the blower 140 and sent to the intake valve 156 on the downstream side of the flow path in a state measured by the pressure sensor 155.
The inhaled air sent to the inhalation valve 156 is configured to be sent to the patient P through the inhalation filter IF, the humidifier HU, and the mask MK by the valve opening control by the control unit 110.

On the other hand, the exhalation flow path 160 is provided with an exhalation valve 161, a flow sensor 162, and an exhalation atmospheric port 163 as an example.
Among these, the exhalation valve 161 is configured to send the exhalation from the patient P via the mask MK and the exhalation filter EF to the flow rate sensor 162 on the downstream side of the flow path by the valve opening control by the control unit 110. Yes.
The sent exhaled air is further sent to the exhaled air port 163 on the downstream side of the flow path in a state measured by the flow sensor 162 and discharged.
The control unit 110 is configured to adjust the flow rate by controlling the opening and closing of the exhalation valve 161 based on the measurement value by the flow sensor 162.

As shown in FIGS. 2 and 3, the blower 140 according to the first embodiment of the present invention includes a motor M100, a hub H, an impeller W, an air suction port I, an air discharge port E, and a cover plate. C.
The motor M100 of the first embodiment is a sleeve rotation type in which a sleeve M130 rotates with respect to a motor shaft M120 in a motor case body M110.
The hub H is integrally fitted with a sleeve M130 which is a rotor.

The impeller W is fitted integrally with the sleeve M130 via the hub H, and the motor shaft M120 is rotatably inserted into the impeller W.
The air suction port I is provided at the upper center of the motor case body M110 of the motor M100 in FIG. 2, and the air discharge port E is provided at the side portion of the motor case body M110 in FIG.
As the impeller W rotates at high speed, external air is sucked into the internal impeller chamber via the air suction port I, the pressure inside the impeller chamber increases, and the air in the impeller chamber becomes air discharge port E. Discharged from.
The cover plate C is disposed above the air suction port I in FIG. 2 with a space therebetween, and is configured to prevent entry of foreign matter and the like.

Next, the motor M100 will be described in detail.
The motor M100 includes a motor case body M110, a motor shaft M120, a sleeve M130 as a dynamic pressure gas bearing, a rotor magnet M140, a drive coil M150 that generates a magnetic force when energized, a yoke M160 as an insulating core, an auxiliary Ball bearings M171 and M172 as bearings and a non-contact detent torque generating mechanism M180 that suppresses rotation of the ball bearings M171 and M172 are provided.
The sleeve M130 is installed around the motor shaft M120 with a minute gap, and a portion opposed to the minute gap is a dynamic pressure gas bearing.

For example, by forming a herringbone-shaped groove on one of the inner peripheral surface of the sleeve M130 and the outer peripheral surface of the motor shaft M120, the outer peripheral surface of the motor shaft M120 and the inner peripheral surface of the sleeve M130 when rotated relatively. A dynamic pressure is generated between them and bearing rigidity is generated.
The rotor magnet M140 is formed of a permanent magnet, and is configured to be fitted to the outer periphery of the sleeve M130 and rotate integrally with the sleeve M130.

The drive coil M150 is arranged as a stator at a position facing the rotor magnet M140 on the outer periphery of the rotor magnet M140, and is attached to the substrate M151 so as to generate a magnetic force when energized.
The yoke M160 is installed on the outer periphery of the drive coil M150, and has an effect of increasing the magnetic force of the drive coil M150.

The two ball bearings M171 and M172 as auxiliary bearings are arranged in series with a sleeve M130 that constitutes a part of the dynamic pressure gas bearing in a path through which torque is transmitted.
Specifically, the ball bearing M171 is held by the bearing holder M173 and rotatably supports the upper end of the motor shaft M120 in FIG.
The bearing holder M173 is attached to the motor case body M110 via a vibration absorbing O-ring M177 formed of an elastic material, and the vibration absorbing O-ring M177 has a function of applying a preload to the bearing holder M173. doing.
Similarly, the ball bearing M172 is held by a bearing holder M174, and rotatably supports the lower end side of the motor shaft M120 in FIG.
The bearing holder M174 is attached to the motor case body M110 via a vibration absorbing O-ring M178 formed of an elastic material, and the vibration absorbing O-ring M178 also has a function of applying a preload to the bearing holder M174. doing.

The non-contact type detent torque generating mechanism M180 is arranged in parallel with the ball bearings M171 and M172 as auxiliary bearings in a path through which torque is transmitted.
Specifically, the non-contact type detent torque generating mechanism M180 rotates integrally with the motor shaft M120, and a movable side annular magnet M181 as a rotating side magnet whose poles change in the circumferential direction, and an outer periphery from the movable side annular magnet M181. And a fixed-side annular magnet M182 as a fixed-side magnet that is disposed on the side and whose poles change in the circumferential direction.
The movable-side annular magnet M181 is fitted on the lower end side of the motor shaft M120 in FIG. 3A and in the vicinity of the upper portion of the ball bearing M172 so as to rotate integrally with the motor shaft M120.
The fixed-side annular magnet M182 is attached to the motor case body M110 at a position facing the movable-side annular magnet M181.
The rotation of the ball bearings M171 and M172 is suppressed by the attractive force of the movable annular magnet M181 and the stationary annular magnet M182.

Further, an inner thrust magnet M175 is fitted to the upper end side of the motor shaft M120 so as to rotate integrally with the motor shaft M120.
An outer thrust magnet M176 is installed at a position facing the outer circumferential side of the inner thrust magnet M175 so as to rotate integrally with the hub H.
By the attractive force of the inner thrust magnet M175 and the outer thrust magnet M176, the relative positional relationship in the thrust direction between the motor shaft M120 and the sleeve M130 is stabilized.

Furthermore, in the present invention, ball bearing rotation detection means M190 as rotation detection means for detecting the rotation of the ball bearings M171 and M172 is installed inside the motor case body M110.
As shown in FIGS. 3B and 4B, the ball bearing rotation detection means M190 is, for example, a dipole magnetized movable side annular magnet M181 and a substrate at a position facing the movable side annular magnet M181. You may comprise by the Hall sensor M191 installed in M151.
When the movable-side annular magnet M181 rotates, its magnetic force changes in a sine wave shape, and the Hall voltage changes by detecting the so-called Hall effect, whereby the ball bearings M171 and M172 rotate. It is a detected configuration.

The ball bearing rotation detection means M190 may be constituted by, for example, an 18-pole fluxgate pattern printed on the substrate M151, and a movable-side annular magnet having the same number of fluxgate patterns and the same number of magnetic poles. Good.
By detecting a change in inductance when the movable annular magnet rotates, the rotation of the ball bearings M171 and M172 is detected.

Further, the ball bearing rotation detection means M190 may be constituted by, for example, a metal uneven portion that rotates integrally with the movable-side annular magnet M181, and an eddy current sensor that is installed to face the metal uneven portion. Good.
The outer peripheral surface of the metal uneven portion is formed in an uneven shape, and the ball bearing M171 is detected by detecting a change in the eddy current magnetic field (a change in the amplitude and phase of the detection coil induced voltage) when the metal uneven portion is rotated. , M172 rotation is detected.
In addition, the ball bearing rotation detection means M190 is not limited to a configuration that detects a magnetic change due to rotation, but may be any other known configuration such as a configuration that detects an optical change due to rotation. Needless to say, it is good.

When a magnetic force is generated by energizing the drive coil M150 and a rotational force is generated in cooperation with the rotor magnet M140, the sleeve M130, the rotor magnet M140, and the rotor magnet M140, as shown by a thick dashed line in FIG. Hub H, impeller W, and outer thrust magnet M176 rotate as the first rotor.
Here, the sum of the friction torque Tb of the ball bearings M171 and M172 and the maximum torque Tdmax generated by the non-contact detent torque generating mechanism M180 when the rotation of the ball bearings M171 and M172 is suppressed is the motor shaft M120 and the sleeve. Since the value is set to be larger than the rotational viscous friction torque Ta of the dynamic pressure gas bearing in a state where M130 is separated from each other, that is, (Tb + Tdmax)> (Ta), the motor shaft M120 does not rotate in this state.

  Here, a disturbance is applied to the motor M100 for some reason, and the motor shaft M120 and the sleeve M130 are relatively swung to come into contact with each other, thereby generating a contact friction torque Tsa in the hydrodynamic gas bearing. When the contact friction torque Tsa reaches the contact friction torque Tka that may damage the dynamic pressure gas bearing, the rotation of the ball bearings M171 and M172 as auxiliary bearings is performed so that (Ta + Tka)> (Tb + Tdmax). Since the value of the maximum torque Tdmax generated by the non-contact detent torque generating mechanism M180 provided to suppress the pressure is set, as shown in FIGS. 4 (A) and 5, adhesion to the dynamic pressure gas bearing Before galling such as seizure occurs, the contact friction torque Tsa = Tka of the dynamic pressure gas bearing is transmitted to the ball bearings M171 and M172. , Ball bearings M171, M172 also starts the rotation.

  4A, the motor shaft M120, the inner diameter side of the ball bearings M171 and M172, the movable annular magnet M181, and the inner thrust magnet M175, the sleeve M130, the rotor magnet M140, The first rotor composed of the hub H, the impeller W, and the outer thrust magnet M176 receives contact friction torque Tka that may damage the dynamic pressure gas bearing, and starts rotating as the second rotor.

The sum of the rotational friction friction torque Ta of the dynamic pressure gas bearing and the contact friction torque Tsa of the dynamic pressure gas bearing when the motor shaft M120 and the sleeve M130 are in contact with the friction torque Tb of the ball bearings M171 and M172. When the sum of the maximum torques Tdmax generated by the non-contact type detent torque generation mechanism M180 provided for suppressing the rotation of the ball bearings M171 and M172 is not satisfied, that is, when (Ta + Tsa) <(Tb + Tdmax) (Tsa < In Tka), the ball bearings M171 and M172 hardly rotate (even if they move slightly at the moment of contact, they do not reach continuous rotation), and therefore, as indicated by the thick dashed line in FIG. And sleeve M130, rotor magnet M140, hub H, impeller W, and outer thrust magnet. Only the first rotor consisting Doo M176 Metropolitan continues to rotate.
This is because there is no possibility of damaging the dynamic pressure gas bearing such as galling.

As shown in FIG. 5, the sum of the rotational viscous friction torque Ta of the dynamic pressure gas bearing and the contact friction torque Tsa of the dynamic pressure gas bearing is the friction torque Tb of the ball bearings M171 and M172 and the ball bearings M171 and M172. When the value becomes larger than the sum of the maximum torque Tdmax generated by the non-contact detent torque generating mechanism M180 provided to suppress the rotation of the motor, that is, when (Ta + Tka)> (Tb + Tdmax) (Tsa = Tka), the ball bearings M171 and M172 start to rotate instantaneously to prevent damage to the dynamic pressure gas bearing, and both the dynamic pressure gas bearing and the ball bearings M171 and M172 rotate to be in a stable state. The transition period up to is as short as tens of milliseconds.
This is because when the motor shaft M120 and the sleeve M130 are separated again, the dynamic pressure gas bearing is not damaged, so that the contact friction torque Tsa becomes zero, while the movable side annular magnet M181 and the stationary side annular magnet M182 , The detent torque Td by the movable side annular magnet M181 and the stationary side annular magnet M182 changes in a sine wave shape according to the relative angle (position) by repeating attraction and repulsion. Since the average detent torque per rotation after the ball bearings M171 and M172 start rotating is zero, no substantial loss occurs.
Then, when the rotational viscous friction torque Ta of the dynamic pressure gas bearing balances with the friction torque Tb of the ball bearings M171 and M172, the rotational speed Na of the sleeve M130 by the dynamic pressure gas bearing and the motor shaft M120 by the ball bearings M171 and M172. The rotation speed Nb is constant.

During the transition period, the rotational speed Na of the dynamic pressure gas bearing decreases due to the occurrence of contact friction torque Tka that may damage the dynamic pressure gas bearing, but on the other hand, the ball bearings M171 and M172 start rotating. The rotation speed Nb gradually increases, and the sum of the rotational viscous friction torque Ta and the contact friction torque Tsa of the dynamic pressure gas bearing balances the friction torque Tb of the ball bearings M171 and M172, that is, (Ta + Tsa). It increases to the rotational speed which becomes = (Tb).
Here, the rotational speed N of the impeller W (motor) is the sum of the rotational speed Na of the dynamic pressure gas bearing and the rotational speed Nb of the ball bearings M171 and M172, that is, (N = Na + Nb). Since the rotational speed Nb of the ball bearings M171 and M172 increases by the amount corresponding to the decrease in the rotational speed Na of the dynamic pressure gas bearing, the rotational speed N of the impeller W (motor) hardly changes as a result.
Even if the contact friction torque Tsa reaches a magnitude Tka that may damage the dynamic pressure gas bearing, and the rotation of the ball bearings M171 and M172 is started, the movable annular magnet M181 and the stationary annular magnet M182 Since the average detent torque per rotation is 0 and there is no substantial loss, the rotational speed N of the impeller W (motor) does not change even after the transition, and the impeller W before and after the occurrence of the oscillating contact occurs. The (motor) rotation speed N is substantially constant.

Here, as shown in FIG. 5, the reason why the rotational speed Na in the dynamic pressure gas bearing after the transition and the rotational speed Nb in the ball bearings M171 and M172 are stabilized at a constant rotational speed is as follows. And the ball bearings M171 and M172 have the relationship between the rotational viscous friction torque Ta of the dynamic pressure gas bearing shown in FIG. 6A, the friction torque Tb of the ball bearings M171 and M172, and the rotational speed. is there.
In other words, after the transition, the viscous friction torque Ta at the time of rotation of the dynamic pressure gas bearing balances with the friction torque Tb of the ball bearings M171 and M172, so that the respective rotational speeds Na and Nb correspond to the torque. is there.

In the present invention, as described above, the ball bearing rotation detection means M190 as the rotation detection means for detecting the rotation of the ball bearings M171 and M172 is installed inside the motor case body M110.
The control unit 110 that controls the rotation of the motor M100 is configured to receive a rotation detection signal from the ball bearing rotation detection means M190.
Thereby, if the ball bearings M171 and M172 start to rotate, the rotation of the ball bearings M171 and M172 is detected.
That is, a change in the internal state of the motor M100 can be grasped.

In this embodiment, the auxiliary bearing is constituted by ball bearings M171 and M172, which are examples of rolling bearings. Therefore, there is no rapid deterioration and galling is unlikely to occur.
That is, when the contact friction torque Tka that may damage the dynamic pressure gas bearing is reached ((Ta + Tka)> (Tb + Tdmax)), the rotation of the ball bearings M171 and M172 is surely started, so that the dynamic pressure is increased. In addition to avoiding damage to the gas bearing in advance, the ball bearings M171 and M172 have a feature that the ball rolls, and therefore, galling hardly occurs.

Further, in the present embodiment, the ball bearings M171 and M172 have a balance when the magnitude of the friction torque Tb of the ball bearings M171 and M172 is balanced with the magnitude of the rotational viscous friction torque Ta (friction torque) of the dynamic pressure gas bearing. The rotational speed Nb is smaller than the rotational speed Na of the dynamic pressure gas bearing.
As a result, since the master-slave relationship is maintained with the dynamic pressure gas bearing as the main and the ball bearings M171 and M172 as the slave, the ball bearings M171 and M172 rotate with a sufficient margin, and the life is remarkably shortened. Never become.

Then, a series of operation | movement until it returns to the state which suppressed rotation of the auxiliary bearing is demonstrated.
As shown by an arrow A1 in FIG. 6B, when the drive coil M150 is energized, initially, the first rotation including the sleeve M130, the rotor magnet M140, the hub H, the impeller W, and the outer thrust magnet M176. The rotation speed N of the impeller W (motor) increases up to, for example, a predetermined rotation speed of 80,000 rotations / minute, starting from the state where the child is stopped (the state of FIG. 3A).
In other words, the rotational speed N of the impeller W (motor) increases up to a predetermined rotational speed of 80,000 rotations / minute by being rotatably supported by the dynamic pressure gas bearing and rotating from a stopped state. To do.

  Then, for some reason, disturbance is applied to the motor M100, the motor shaft M120 and the sleeve M130 are relatively swung and contacted, and the contact friction torque Tsa of the hydrodynamic gas bearing is generated and increased. Prior to the occurrence of galling such as adhesion or seizure in the pressurized gas bearing, the sum of the rotational viscous friction torque Ta and the contact friction torque Tsa = Tka of the dynamic pressure gas bearing is the friction torque Tb of the ball bearings M171 and M172. The value is larger than the sum of the maximum torque Tdmax generated by the non-contact detent torque generating mechanism M180 in a state where the rotation of the ball bearings M171 and M172 is suppressed ((Ta + Tka)> (Tb + Tdmax)).

Then, contact friction torque Tka that may damage the dynamic pressure gas bearing is transmitted to the ball bearings M171 and M172, and at the same time as the rotation of the ball bearings M171 and M172 is started, as shown by an arrow A2, The rotational speed Na of the pressurized gas bearing decreases to 51,000 revolutions / minute, and at the same time, the rotational speed Nb of the ball bearings M171 and M172 increases to 29,000 revolutions / minute as shown by the arrow B2 (FIG. 4). (A) state).
The first rotor and the second rotor may be rotated as they are, but the ball bearings M171 and M172 which are auxiliary bearings are contact type bearings, and therefore only the first rotor from the viewpoint of motor life. It is desirable to return to the original state where the is rotating.

Therefore, by controlling the energization to the drive coil M150, as indicated by the arrows A3 and B3, the rotational speed N of the impeller W (motor) is reduced to reduce the rotational speed Na of the hydrodynamic gas bearing and the ball bearing M171. , M172 is decreased.
At this time, the inclination of the curve of the rotational speed Na of the dynamic pressure gas bearing and the rotational speed Nb of the ball bearings M171 and M172 shown in FIG. 6B is related to the relationship between the rotational speed and the friction torque shown in FIG. Each will change accordingly.

That is, the rotational speed Na of the dynamic pressure gas bearing and the rotational speed Nb of the ball bearings M171 and M172 are kept in balance with the viscous friction torque Ta during rotation of the dynamic pressure gas bearing and the friction torque Tb of the ball bearings M171 and M172. Decrease.
When the rotational speed N of the impeller W (motor) is reduced by controlling the energization to the drive coil M150 until at least A4 and B4 where the rotational speed Nb of the ball bearings M171 and M172 becomes 0, the non-contact type The rotation of the ball bearings M171 and M172 is again suppressed by the detent torque generation mechanism M180, and the original state where only the first rotor shown in FIG.

As described above, the ball bearing rotation detecting means M190 can detect whether or not the rotation speed Nb of the ball bearings M171 and M172 has become zero.
Then, as necessary, energization to the drive coil M150 is controlled to increase the rotational speed N of the impeller W (motor) as indicated by an arrow A1.
Further, as indicated by arrows A3 and B3, the energization of the drive coil M150 is controlled to reduce the rotational speed N of the impeller W (motor), so that only the first rotor is rotating. In addition to this, the impeller W (motor) may be rotated as indicated by the arrow A1 after the impeller W is completely stopped.
Further, when the non-contact type detent torque generating mechanism M180 is an electromagnet instead of a permanent magnet, the attraction force of the electromagnet is increased, the rotational speed Nb of the ball bearings M171 and M172 is reduced to 0, and then the electromagnet is used. The suction force may be returned to the original size.

In addition, the non-contact detent torque generating mechanism M180 is composed of a permanent magnet, and separately from this, a non-contact detent torque generating mechanism (not shown) using an electromagnet is combined for braking the ball bearings M171 and M172. You can also.
In this case, only when it is desired to set the rotational speed Nb of the ball bearings M171 and M172 to 0, it is only necessary to generate an electromagnetic force in a non-contact type detent torque generating mechanism using an electromagnet (not shown). It can be suppressed and is efficient.

Next, control in the artificial respiration apparatus 100 using the motor M100 will be described.
As shown in FIG. 7, in step S11 of the first mode, the control unit 110 confirms that the ball bearings M171 and M172 are not rotating depending on whether or not a rotation detection signal is received from the ball bearing rotation detection means M190. To do.
In step S12, it is assumed that the dynamic pressure gas bearing is in rocking contact and contact friction torque Tsa is generated.
In step S13, the control unit 110 determines whether or not the ball bearings M171 and M172 are rotating based on whether or not a rotation detection signal is received from the ball bearing rotation detection unit M190.
If it is determined that it is rotating, the process proceeds to step S14.
On the other hand, if it is determined that it is not rotating, the process returns to step S11.

In step S14, control unit 110 adds one time as the number of times the rotation detection signal has been received.
In other words, the rotation count of the rotation start times of the ball bearings M171 and M172 is executed.
In step S15, the control unit 110 determines whether or not the number of rotation starts has reached a predetermined number.
Here, the predetermined number of times is the number of times before the lifetime of the ball bearings M171 and M172 elapses, and it is desirable to allow for an appropriate safety factor according to the use environment, application, and the like.
If it is determined that the number of rotations has reached the predetermined number, the process proceeds to step S16.
On the other hand, if it is determined that the number of rotation starts is less than the predetermined number, the first mode is terminated.

In step S16, the control unit 110 instructs at least one of the notification unit 130 and the display unit 120 to notify or display that the replacement time of the motor M100 and the ball bearings M171 and M172 has arrived.
Then, the first mode ends.
With the first mode, the lifetime of the ball bearings M171 and M172 can be predicted from the number of rotation starts.
And based on this lifetime prediction, it is possible to notify the user of the replacement time of the motor M100 and the ball bearings M171 and M172.

As shown in FIG. 8, in step S21 of the second mode, the controller 110 determines whether or not the ball bearings M171 and M172 are rotating depending on whether or not a rotation detection signal is received from the ball bearing rotation detection means M190. to decide.
If it is determined that it is rotating, the process proceeds to step S22.
On the other hand, if it is determined that it is not rotating, the process returns to step S21.
In step S <b> 22, the control unit 110 calculates the accumulated time while receiving the rotation detection signal from the ball bearing rotation detection means M <b> 190.

In step S <b> 23, the control unit 110 compares the ball bearing rotation integration time with a predetermined set time before the ball bearings M <b> 171 and M <b> 172 expire.
Here, the predetermined set time is the accumulated rotation time before the lifetime of the ball bearings M171 and M172 elapses, and it is desirable to anticipate an appropriate safety factor depending on the use environment, application, and the like.
If it is determined that the ball bearing rotation accumulated time has reached a predetermined set time before the lifetime of the ball bearings M171 and M172 has elapsed, the process proceeds to step S24.
When it is determined that the ball bearing rotation accumulated time does not reach the predetermined set time before the lifetime of the ball bearings M171 and M172 has elapsed, the second mode is terminated.

In step S24, the control unit 110 instructs at least one of the notification unit 130 and the display unit 120 to notify or display that the replacement time of the motor M100 and the ball bearings M171 and M172 has arrived.
Then, the second mode ends.
With the second mode, the lifetime of the ball bearings M171 and M172 can be predicted by calculating from the accumulated rotation time.
And based on this lifetime prediction, it is possible to notify the user of the replacement time of the motor M100 and the ball bearings M171 and M172.

As shown in FIG. 9, in step S31 of the third mode, the control unit 110 determines whether or not the ball bearings M171 and M172 are rotating depending on whether or not a rotation detection signal is received from the ball bearing rotation detection means M190. to decide.
If it is determined that it is rotating, the process proceeds to step S32.
On the other hand, if it is determined that it is not rotating, the process returns to step S31.
In step S32, the control unit 110 measures the time after receiving the rotation detection signal from the ball bearing rotation detection means M190, and determines whether or not a predetermined time has elapsed.
Here, the predetermined time is a time set for shifting from a state in which the ball bearings M171 and 172 are rotating to a state in which the rotation is again suppressed, and a time in which the ball bearings M171 and 172 are rotating. If you want to shorten the time as much as possible, set it to a few seconds, or if you want to rotate it to some extent, set it from a few minutes to a few hours. Can do.
And when it determines with predetermined time having passed, it progresses to step S33.
On the other hand, when it determines with predetermined time not having passed, it returns to step S32.

In step S33, control unit 110 decreases the rotation speed of motor M100.
In step S34, the control unit 110 determines whether or not the ball bearings M171 and M172 are rotating based on whether or not a rotation detection signal is received from the ball bearing rotation detection unit M190.
If it is determined that it is rotating, the process returns to step S33.
On the other hand, if it is determined that it is not rotating, that is, if it is determined that rotation of the auxiliary bearing has been suppressed again by the non-contact detent torque generating mechanism M180, the process proceeds to step S35.

In step S35, control unit 110 increases the number of rotations of motor M100.
In step S36, control unit 110 matches the rotational speed of motor M100 with the initial predetermined rotational speed, and ends the third mode.
In the third mode, the rotation of the ball bearings M171 and M172 is suppressed, and the motor shaft M120 and the sleeve M130 return to the rotational state and the rotational speed before the rocking contact.

As shown in FIG. 10, in step S41 of the fourth mode, the controller 110 determines whether or not the ball bearings M171 and M172 are rotating depending on whether or not a rotation detection signal is received from the ball bearing rotation detection means M190. to decide.
If it is determined that it is rotating, the process proceeds to step S42.
On the other hand, if it is determined that it is not rotating, the process returns to step S41.

In step S42, the control unit 110 compares the count value (k value) with a predetermined threshold value (threshold value = 2 as an example).
If it is determined that the count value has reached a predetermined threshold, the fourth mode is terminated.
On the other hand, if it is determined that the count value has not reached the predetermined threshold value, the process proceeds to step S43.
In step S43, control unit 110 decreases the rotational speed of motor M100.

In step S44, the control unit 110 determines whether or not the ball bearings M171 and M172 are rotating based on whether or not a rotation detection signal is received from the ball bearing rotation detection unit M190.
If it is determined that it is rotating, the process returns to step S43.
On the other hand, if it is determined that it is not rotating, the process proceeds to step S45.
In step S45, control unit 110 increases (accelerates) the rotational speed until the rotational speed of motor M100 reaches a predetermined rotational speed.

In step S46, the control unit 110 compares the rotational speed N of the impeller W with the rotational speeds of the ball bearings M171 and M172, and determines whether or not they are equal.
Here, the rotation speeds of the ball bearings M171 and M172 are calculated by, for example, the magnetic field change amount of the ball bearing rotation detection means M190, that is, the magnetic field change per unit time.
If it is determined that both are equal, the process proceeds to step S47.
On the other hand, if it is determined that they are not equal, the fourth mode is terminated.

In step S47, the control unit 110 increases the count value by one.
In step S42 again, the control unit 110 compares the count value (k value) with a predetermined threshold value (threshold value = 2 as an example).
If it is determined that the count value has reached a predetermined threshold value, it is determined that the dynamic pressure gas bearing is in an abnormal state, and the fourth mode is terminated.
On the other hand, if it is determined that the count value has not reached the predetermined threshold, the process returns to step S43.
In the fourth mode, whether or not the dynamic pressure gas bearing is galling can be determined by reducing the number of rotations of the motor M100 and trying to rotate only with the dynamic pressure gas bearing. When it is determined that the motor is not in a rotating state (galling occurs), the motor M100 is rotated only by the ball bearings M171 and M172 after notifying that the dynamic pressure gas bearing is in an abnormal state. it can.
In this case, since the number of rotations of the motor M100 is equal to the number of rotations of the ball bearings M171 and M172, the time until the ball bearings M171 and M172 reach the end of their service life is shortened. Then, it is desirable to prompt the replacement of the motor M100 earlier by setting the rotation integration time before the life expecting the safety factor more than in the second mode.

  In the artificial respiration apparatus 100 according to the first embodiment of the present invention thus obtained, the blower 140 as the pressurizing means has an impeller W that sucks and compresses air, and a motor that rotates the impeller W. A motor shaft that is rotatable with respect to the motor case body, a drive coil that is disposed within the motor case body and generates a magnetic force when energized, and an attractive / repulsive force between the drive coil The ball bearings M171 and M172, which are examples of auxiliary bearings for the dynamic pressure gas bearing, are provided with a rotor magnet that generates a rotational force using the motor and a dynamic pressure gas bearing having a sleeve that covers the periphery of the motor shaft. A non-contact type detent torque generating mechanism M180 that is arranged in series with the pressurized gas bearing and suppresses the rotation of the ball bearings M171 and M172 is a ball bearing M171. When the motor shaft M120 and the sleeve M130 are arranged in parallel and the motor shaft M120 and the sleeve M130 are separated from each other, the viscous friction torque Ta at the time of rotation of the dynamic pressure gas bearing and the motor shaft M120 and the sleeve M130 are in oscillating contact with each other. Contact friction torque Tka that may damage the bearing, rotational friction torque Tb of ball bearings M171 and M172, and maximum torque Tdmax generated while rotation of ball bearings M171 and M172 is suppressed by non-contact type detent torque generation mechanism M180 When the value of Tdmax is set so that (Ta + Tka)> (Tb + Tdmax)> (Ta), the motor of the rotating body can be obtained without causing fatal damage to the dynamic pressure gas bearing. The total number of rotations with respect to the case body is kept almost constant before and after the occurrence of rocking contact. Air can be stably supplied to.

  Further, a non-contact type detent torque generating mechanism M180 is disposed on the outer circumferential side of the movable side annular magnet M181 as a rotating side magnet whose pole is changed in the circumferential direction of the motor shaft M120, and in the circumferential direction. By providing the fixed-side annular magnet M182 as a fixed-side magnet whose poles are replaced with each other, substantial loss due to the detent torque Td when the ball bearings M171 and M172 are rotating can be eliminated.

  Further, since the auxiliary bearings are ball bearings M171 and M172 which are examples of rolling bearings, the motor shaft M120 and the sleeve M130 are in oscillating contact with each other, and the viscous friction torque Ta and the contact friction torque at the time of rotation of the hydrodynamic gas bearing. The sum of Tsa = Tka is larger than the sum of the friction torque Tb of the ball bearings M171 and M172 and the maximum torque Tdmax generated by the non-contact detent torque generating mechanism M180 in a state where the rotation of the ball bearings M171 and M172 is suppressed. When the value becomes large ((Ta + Tka)> (Tb + Tdmax)), that is, before galling such as adhesion or seizure occurs in the dynamic pressure gas bearing, the rotation of the ball bearings M171 and M172 is surely started. Can do.

Further, a ball bearing rotation detecting means M190, which is a rotation detecting means for detecting the rotation of the ball bearings M171 and M172, is installed inside the motor case body M110, and the control unit 110 for controlling the rotation of the motor M100 is used for the ball bearing rotation. By receiving the rotation detection signal from the detection means M190, the control unit 110 can grasp the rotation of the ball bearings M171 and M172.
In addition, when the control unit 110 receives a rotation detection signal, the control unit 110 issues a notification command to the notification unit 130, so that the user can know the rotation of the ball bearings M171 and M172.

Further, when the control unit 110 receives the rotation detection signal, the control unit 110 measures the accumulated rotation time of the ball bearings M171 and M172, so that the control unit 110 calculates the elapsed service life of the ball bearings M171 and M172 from the accumulated rotation time. Can be predicted.
Further, the control unit 110 counts the number of times the rotation detection signal is received, so that the control unit 110 can predict the lifetime of the ball bearings M171 and M172 from the number of rotation starts.

  In addition, after receiving the rotation detection signal, the control unit 110 decreases the rotation speed of the motor M100 until the rotation detection signal disappears, and increases the rotation speed of the motor M100 after the rotation detection signal disappears. The effect is enormous, for example, the rotational state and the rotational speed before M120 and the sleeve M130 are brought into oscillating contact can be restored.

Next, the blower 240 using the motor M200 according to the second embodiment of the present invention will be described with reference to FIG.
Here, FIG. 11A is a side sectional view showing the blower 240 using the motor M200 according to the second embodiment of the present invention, and FIG. 11B is a reference numeral 11B- in FIG. It is principal part side sectional drawing seen by 11B.
The motor M200 of the second embodiment is obtained by changing the sleeve rotation type motor M100 of the first embodiment to a shaft rotation type, and many elements are common to the motor M100 of the first embodiment. Detailed explanation is omitted, and only the code of the M200 series in which the last two digits are common is attached.

In the motor M200 of the blower 240 according to the second embodiment of the present invention, as shown in FIG. 11A, the impeller W and the hub H are attached so as to rotate integrally with the motor shaft M220.
A rotor case M241 is disposed below the hub H and is configured to rotate integrally with the motor shaft M220.
A rotor magnet M240 is disposed on the inner peripheral side of the rotor case M241 and is configured to rotate integrally with the motor shaft M220.

A drive coil M250 is provided as a stator on the inner peripheral side of the rotor magnet M240.
A yoke M260 is disposed on the inner peripheral side of the drive coil M250.
Ball bearings M271 and M272 as auxiliary bearings are respectively held by bearing holders M273 and M274, and the bearing holders M273 and M274 are attached to the yoke M260.
Ball bearings M271 and M272 rotatably support the sleeve M230 with respect to the yoke M260 constituting the stator.
The sleeve M230 is provided around the motor shaft M220.

A movable annular magnet M281 as a rotating magnet of the non-contact type detent torque generating mechanism M280 is disposed on the outer periphery of the sleeve M230 so as to rotate integrally with the sleeve M230, and a stationary annular magnet M282 as a stationary magnet. Is attached to the motor case body M210.
Further, the inner thrust magnet M275 is disposed at the lower end of the motor shaft M220 in FIG. 11A so as to rotate integrally with the motor shaft M220.
On the other hand, the outer thrust magnet M276 is attached to the motor case body M210 at a position facing the inner thrust magnet M275.
Then, as indicated by the thick dashed line, the motor shaft M220, the impeller W, the hub H, and the inner thrust magnet M275 constitute a first rotor.
Further, as indicated by a thick two-dot chain line, the sleeve M230, the movable-side annular magnet M281, and the inner diameter side of the ball bearings M271 and M272 constitute a second rotor.

Furthermore, as shown in FIG. 11 (B), the ball bearing rotation detecting means 290 is installed on the substrate M251 at a position facing the movable side annular magnet M281 and the movable side annular magnet M281, for example. A hall sensor 291 may be used.
The rotation of the ball bearings M271 and M272 is detected by detecting the so-called Hall effect in which the Hall voltage changes when the movable annular magnet M281 rotates.
Thus, even if the motor M200 is a shaft rotation type, the same operational effects as those of the sleeve rotation type of the first embodiment described above can be obtained.
In the two embodiments, as the non-contact type detent torque generating mechanism, an example in which the rotating side magnet and the stationary side magnet are arranged to face each other in the direction (radial direction) orthogonal to the rotating shaft is shown, but the same as the rotating shaft It can also be arranged opposite to the direction (axial direction).
The same applies to the rotation detection means.
Further, the fixed side magnet (permanent magnet) of the non-contact type detent torque generating mechanism can be replaced with a magnetic member in which a plurality of protrusions are formed toward the rotating side magnet, such as gear teeth of an internal gear. .

DESCRIPTION OF SYMBOLS 100 ... Artificial respiration apparatus 110 ... Control part 111 ... Drive circuit 120 ... Display means 130 ... Notification means 140, 240 ... Blower 150 ... Intake flow path 151 ... Inhalation Air port 152 ... Filter 153 ... Oxygen port 154 ... Oxygen blender 155 ... Pressure sensor 156 ... Intake valve 160 ... Exhalation flow path 161 ... Exhalation valve 162 ... Flow rate Sensor 163 ... Exhalation air port C ... Cover plate E ... Air exhaust port EF ... Exhalation filter H ... Hub HU ... Humidifier I ... Air suction port IF ... · Intake filters M100, M200 ... Motors M110, M210 ... Case bodies M120, M220 ... Motor shafts M130, M230 ... Three (Dynamic pressure gas bearing)
M140, M240 ... Rotor magnet
M241 ... Rotor case M150, M250 ... Drive coils M151, M251 ... Substrate M160, M260 ... Yoke (insulating core)
M171, M271 ... Ball bearing (auxiliary bearing)
M172, M272 ... Ball bearing (auxiliary bearing)
M173, M273 ... Bearing holders M174, M274 ... Bearing holders M175, M275 ... Inner thrust magnets M176, M276 ... Outer thrust magnets M177 ... O-rings for vibration absorption M178 ... For vibration absorption O-ring M180, M280 ... Non-contact detent torque generation mechanism M181, M281 ... Movable ring magnet (rotary magnet)
M182, M282 ... Fixed side annular magnet (fixed side magnet)
M190, M290 ... Ball bearing rotation detection means M191, M291 ... Hall sensor MK ... Mask N ... Impeller speed Na ... Speed Nb in dynamic pressure gas bearing ... Ball Number of revolutions P in the bearing P ... Patient Ta ... Viscous friction torque during rotation Td ... (Detent torque Tsa ... Contact friction torque Tka ... (with dynamic pressure gas bearing) ... Contact friction torque Tb that may damage the hydrodynamic gas bearing Fb (ball bearing) friction torque W ... impeller

Claims (7)

Artificial respiration comprising pressurizing means for sucking and pressurizing air from the suction port, an inspiratory flow path for supplying air pressurized by the pressurizing means to the mask, and an expiratory flow path for discharging air from the mask In the device
The pressurizing means has an impeller that sucks and compresses the air, and a motor that rotates the impeller.
The motor includes a motor case body, a motor shaft that is rotatably supported with respect to the motor case body, a drive coil that is disposed in the motor case body and generates a magnetic force by energization, and the drive coil. A rotor magnet that generates a rotational force using attraction / repulsion force, a dynamic pressure gas bearing having a sleeve that covers the periphery of the motor shaft, and the motor pressure shaft that is arranged in series with the dynamic pressure gas bearing can freely rotate. An auxiliary bearing to be supported on the non-contact type detent torque generating mechanism arranged in parallel with the auxiliary bearing to suppress the rotation of the auxiliary bearing,
The viscous friction torque during rotation of the dynamic pressure gas bearing in a state where the motor shaft and the sleeve are separated from each other is Ta,
When the motor shaft and the sleeve are in oscillating contact, a contact friction torque that may damage the dynamic pressure gas bearing is expressed as Tka,
Tb is the rotational friction torque of the auxiliary bearing.
When the maximum torque generated in a state where the rotation of the auxiliary bearing is suppressed by the non-contact detent torque generating mechanism is Tdmax,
(Ta + Tka)> (Tb + Tdmax)> (Ta)
A value of Tdmax is set so that   The non-contact type detent torque generating mechanism is disposed so as to face the rotation side magnet that rotates integrally with the motor shaft and changes its pole in the circumferential direction, or on the outer side of the rotation side magnet or in the axial direction of the rotation side magnet. The artificial respiration apparatus according to claim 1, further comprising a fixed-side magnet whose pole is changed in the circumferential direction.   The artificial respiration apparatus according to claim 1 or 2, wherein the auxiliary bearing is a rolling bearing. A rotation detecting means for detecting the rotation of the auxiliary bearing is installed,
The artificial respiration apparatus according to any one of claims 1 to 3, wherein a control unit that controls rotation of the motor receives a rotation detection signal from the rotation detection unit. The artificial respiration apparatus according to claim 4 , wherein when the control unit receives the rotation detection signal, the control unit starts measuring the rotation integration time of the auxiliary bearing. The artificial respiration apparatus according to claim 4 or 5, wherein the control unit counts the number of times the rotation detection signal is received. After the control unit receives the rotation detection signal, the control unit decreases the rotation speed of the motor until the rotation detection signal is not received, and increases the rotation speed of the motor after the rotation detection signal is not received. The artificial respiration apparatus according to any one of claims 4 to 6 , wherein the rotation is returned to a state in which the rotation of the auxiliary bearing is suppressed.