KR20140098924A - IPM(Interior Permanent Magnet) Motor able to eliminate the Hall-sensor Noise and Hydraulic Power Steering Pump having the same - Google Patents

Abstract

The present invention relates to an inner permanent magnet motor capable of eliminating hall sensor noise and a steering pump having the same, which comprise: a housing for forming an outer tube; a gear pump module supported on one side of the housing to pressurize the fluid; and a motor module supported on the other side of the housing to provide a driving force of the gear pump module, wherein the motor module includes a stator supported by the housing to supply current by applied power, and a rotor having a motor shaft to rotate by the stator and a permanent magnet to generate a magnetic force. The permanent magnet is embedded and more projected than the length corresponding to the stator. Therefore, the hall sensor can detect the permanent magnet embedded by the rotor without an error, improve economic efficiency by reducing material costs and manufacturing costs, and improving efficiency, reliability, and the like with more stable operation.

Description

[0001] The present invention relates to a hall sensor noise cancelable internal permanent magnet motor having an interior permanent magnet motor (IPM) having a Hall-sensor noise and a hydraulic power steering pump having the same,

The present invention relates to an internal permanent magnet motor capable of removing hole sensor noise and a steering pump having the same. More specifically, the present invention relates to an internal permanent magnet motor capable of removing noise from a hall sensor noise, .

Automobiles are a modern means of transportation that combines many components. Such an automobile usually rotates the steering wheel to adjust the traveling direction of the automobile. Thus, the wheel connected to the steering wheel is rotated, and the driver runs while adjusting the traveling direction of the automobile. Among the various parts of the vehicle, the steering device functions to adjust the driver to proceed as the driver intends.

Among such steering apparatuses, there is a hydraulic power steering apparatus provided with a pump for supplying hydraulic pressure for assisting a rotational force of a steering wheel provided by a driver so that the driver can more easily rotate the steering wheel.

This hydraulic power steering apparatus (hereinafter referred to as a " steering apparatus ") is a system in which a hydraulic power supplied from a steering pump provided in the middle of a steering linkage connected to a steering wheel is energized by a power steering gear, (Front wheel or rear wheel) to increase the steering force, allowing the driver to make light and quick steering with little force. That is, the steering apparatus can reduce the steering force of the steering wheel by the driver and prevent the impact from being transmitted from the road surface to the steering wheel through the front wheel.

The steering apparatus includes an input transmitting mechanism for generating a steering force to transmit a steering force or changing a steering force direction and a steering mechanism for generating a steering assist force or reducing a steering assist force, and the steering mechanism includes a steering pump, a control valve .

On the other hand, the steering pump is generally divided into two types depending on how it is driven. One is to receive power from the engine and the other is a separate electric motor that drives the steering pump without receiving power from the engine. In recent years, there has been a preference for an electrically driven steering pump capable of operating a steering pump only when it is necessary to seek a more efficient and environmentally friendly automobile.

The steering pump system including such an electrically driven steering pump has a somewhat different structure from the conventional engine driven steering pump. The steering pump system includes an electric motor for providing power, a pump assembly for compressing the fluid by rotation of the electric motor, a housing for supporting and guiding the electric motor and the pump assembly, and an angle-steering pump And a control unit for controlling the electric motor based on the pressure and the like.

In recent years, in view of the improvement of fuel efficiency and environmental friendliness of the vehicle, steering pumps driven by electric motors are being developed more and more. In particular, a hall sensor for indicating the position of a magnet as a rotating body is mounted on the BLDC motor. Through the Hall sensor, the position of the motor magnet can be determined, and the rotational speed and rotation angle of the motor can be known.

Here, the motor is divided into an interior permanent magnet (IPM) motor, which is a type in which a rotating magnet is embedded, and an SMP (Surface Permanent Magnet) motor, in which a magnet is bonded to the surface. Since the internal IPM motor can not properly detect the magnetic characteristics due to the noise component due to the reluctance torque due to the permanent magnet embedded in the inside of the motor, the Hall sensor is usually enclosed.

An example of the IPM motor 10 having such characteristics is shown in Fig. The IPM motor 10 includes a rotor 12 having a magnet (not shown), a stator 11, and a rotating shaft 14 coupled to the center of the rotor 12, A Hall sensor 17 for detecting the rotation of the sensing magnet 16 and a Hall sensor 17 electrically connected to the Hall sensor 17, ). A signal sensed by the hall sensor 17 is transmitted to the driving IC to drive the IPM motor 10. [ However, in this conventional technique, the hall sensor 17 is installed apart from the rotor 12 and the stator 11, and a separate substrate 18 and sensing magnet 16 are required, so that the number of parts increases, The detection of the sensing magnet 16 causes an error.

Therefore, it is desirable to be able to provide an IPM motor for a steering pump that can prevent an error in sensing a magnet by a Hall sensor, reduce the number of parts, and facilitate manufacture.

It is an object of the present invention to provide an internal permanent magnet motor capable of eliminating hole sensor noise that can prevent an error in sensing a magnet and a steering pump having the same.

Another object of the present invention is to provide an internal permanent magnet motor capable of eliminating hole sensor noise, which is simple in structure and can reduce the number of parts, and a steering pump having the same.

It is still another object of the present invention to provide an internal permanent magnet motor capable of removing hall sensor noise that can improve economical efficiency and a steering pump having the same.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gear pump module that includes a housing that forms an outer appearance, a gear pump module that is supported on one side of the housing and pressurizes fluid, and a motor module that is supported on the other side of the housing to provide driving force to the gear pump module An internal permanent magnet motor used for a steering pump, the motor module comprising: a stator supported by the housing so as to be supplied with current by an applied power source; a motor rotating shaft rotated by the stator; and a permanent magnet Wherein the permanent magnet is embedded and protrudes more than a length corresponding to the stator. The present invention provides an inner permanent magnet motor capable of removing hall sensor noise.

Further, it is preferable that a hall sensor for detecting the position of the protruding permanent magnet is coupled to one side of the stator.

On the other hand, an object of the present invention is to provide an image forming apparatus comprising: a housing forming an appearance; And a motor module supported on the other side of the housing to provide a driving force to the gear pump module, wherein the motor module comprises: And a rotor having a motor rotation shaft rotated by the stator and a permanent magnet generating a magnetic force, wherein the permanent magnet is embedded and protrudes more than a length corresponding to the stator Wherein the Hall sensor noise cancelable internal permanent magnet motor is characterized in that the Hall sensor is removable.

Further, it is preferable that a hall sensor for detecting the position of the protruding permanent magnet is coupled to one side of the stator.

According to the present invention, it is possible to provide an internal permanent magnet motor capable of preventing an error in sensing a magnet and capable of reducing a Hall sensor noise, which is simple in structure and can reduce the number of parts, and a steering pump having the internal permanent magnet motor.

Further, it is possible to provide an internal permanent magnet motor capable of removing Hall sensor noise, which can improve economy, reliability and efficiency, and a steering pump having the same.

1 is an exploded perspective view of a steering pump according to an embodiment including a motor of the present invention,
Fig. 2 is a partially cutaway perspective view of Fig. 1,
3 is a cross-sectional view of an inner permanent magnet (IPM) motor according to an embodiment of the invention,
Fig. 4 is a side view and a cross-sectional view showing only the rotor of Fig. 3,
FIG. 5 (a) is a waveform diagram of a sense signal of the Hall sensor according to the related art,
FIG. 5 (b) is a graph showing a detection signal waveform of the Hall sensor according to the present invention,
6 is a cross-sectional view of an internal permanent magnet (IPM) motor according to the prior art.

Hereinafter, an embodiment of the Hall sensor noise cancelable internal permanent magnet motor and the steering pump having the same will be described with reference to FIGS. 1 to 5. FIG.

FIG. 1 is an exploded perspective view of a steering pump according to an embodiment including a motor of the present invention, FIG. 2 is a partially cutaway perspective view of FIG. 1, and FIG. 3 is a perspective view of an inner permanent magnet according to an embodiment of the present invention 4 is a side view and a cross-sectional view showing only the rotor of Fig. 3, Fig. 5 (a) is a sense signal waveform of the Hall sensor according to the related art, and Fig. 5 (b) Which is the sensing signal waveform of the Hall sensor.

The steering pump 100 according to the present invention for generating the oil pressure assisting the rotational force of the steering wheel for the automobile is a gear type pump among pump types. 1 and 2, the steering pump 100 includes a housing 110 having a partition member 117 that receives a working fluid and defines a space, and a housing 110 coupled to one side of the housing 110 A cap 190 for sealing one side of the housing 110, a housing cover 180 coupled to the other side of the housing 110 to seal the other side of the housing 110, And a gear pump module 130 which is accommodated between the gear pump module 190 and the partition member 117 to pressurize the working fluid. The working fluid sucked into the gear pump module 130 is stored, And includes a suction buffer portion 195a for reducing pulsation and a pressure buffer portion 132 provided for the gear pump module 130 so as to reduce the pulsation of the fluid discharged from the gear pump module 130 do. The steering pump 100 includes a motor module 150 that provides a driving force to the gear pump module 130.

Hereinafter, the vertical direction in Figs. 1 and 2 will be referred to as a vertical direction for convenience, if necessary.

The housing 110 preferably has a sufficient rigidity to substantially form an outer appearance of the steering pump 100 and to support or accommodate various configurations. The housing 110 may be made of a steel material, It is preferable to be made by casting including a material including an aluminum-based alloy.

The housing 110 has a partition member 117 which divides the space vertically inside. A gear pump module accommodating portion 113 capable of accommodating the gear pump module 130 is formed on the upper side of the partition wall member 117 and a motor module accommodating portion 113 accommodating the motor module 150 (Not shown).

The discharge port 119 is formed at one side of the partition member 117 so that the pressurized working fluid is discharged from the steering pump 100 to provide an auxiliary force to the steering wheel. As shown in FIG.

A shaft hole 117a is formed at a central portion of the partition member 117 so as to transmit the rotational force of the motor module 150 to the gear pump module 130 and a working fluid is supplied to the second suction fluid buffer part 195b A central suction flow path 117c formed so as to communicate with the gear pump module 130 and a flow of fluid from the first suction fluid buffering part 195a to the second suction fluid buffering part 195b, One or more upper and lower suction passages 117b are formed so as to be guided.

The motor module 150 may include various forms as well as a wet motor that is received in the second suction fluid buffer 195b and contacts the working fluid.

The steering pump 100 applies power to the motor module 150 and controls the driving of the motor module 150, the driving control of the motor module 150, the transmission and reception of various signals, And a module 170. The module 170 includes a plurality of modules. The driving circuit module 170 includes a driving circuit member 175 including a PCB and the like for transmitting and receiving various signals and the like so that the driving circuit member 175 is supported and the driving circuit member 175 is isolated from the working fluid. And a driving circuit module supporting member 173 coupled to the housing 110.

Reference numeral 177 denotes a wiring access port through which electric wires, cables, and the like connected to the drive circuit module 170 or the motor module 150 can enter and exit.

The gear pump module 130 includes a gear pump housing 110, a gear pump cover 133 that seals the gear pump housing 110, and a gear pump cover 133, which is provided inside the gear pump housing 110, And a pumping portion 135 that presses the pumping gear 135a. The gear pump module 130 includes a pump module fixing member 139a including a bolt for coupling the gear pump module 130 with the partition member 117 and a pump module fixing member 139b having a high pressure discharge pressure And a relief valve 138 that is discharged to the low-pressure portion. Here, the high-pressure working fluid of the pressurization buffer 132 discharged from the relief valve 138 is discharged to the first suction fluid buffer 195a where the low-pressure fluid is stored.

In the gear pump housing 110, a pumping portion 135 for pressurizing a low-pressure working fluid with a high-pressure working fluid is accommodated in the pumping portion accommodating portion 136.

The pumping section 135 includes a pumping gear 135a interlocked to press the low-pressure working fluid with a high-pressure working fluid, a gear housing 110 supporting the pair of pumping gears 135a at both ends, A longer gear pump rotation shaft 137 and a slightly shorter gear pump rotation shaft 137b which are provided so as to be rotatable and which are engaged with the rotation shaft 151. [

The pressure buffering part 132 is a space formed in the vertical direction along a part of the circumferential direction of the gear pump inner housing 131d and the cross sectional area of the pressurizing buffering part 132 is moved from the area discharged from the pumping part 135 And is gradually reduced along the flow direction in the direction in which the fluid is discharged from the gear pump module 130.

The cross section in the region discharged from the pumping portion 135, which is not shown in the figure of the pressurizing buffer 132, is 'U' and 'U' is formed along the flow direction in the direction of being discharged from the gear pump module 130. [ And the cross-sectional shape of the magnetic substance gradually decreases to be close to one circular shape.

As a result, the cross-sectional area of the flow path gradually decreases from the cushioning air inlet (not shown), which is a narrow flow path, to the cushioning air outlet (not shown) 132 can be formed and the pulsation of the pressurized and discharged working fluid can be effectively reduced through the space called the pressure buffer 132. [

The suction fluid buffering portions 195a and 195b include a first suction fluid buffering portion 195a provided as a space between the partitioning member 117, the cap 190 and the gear pump module 130, And a second suction fluid buffer part 195b provided as a space between the member 117, the housing cover 180 and the motor module 150. [ That is, it is possible to form a maximum space as much as possible so that the working fluid itself can absorb the pulsation generated in the working fluid by the movement of the working fluid sucked and compressed by the pumping gear 135a of the pumping part 135. [

The cap 190 is coupled to the upper side of the housing 110 so that the working fluid received in the first suction fluid buffer part 195a is not leaked. A suction port 193 for guiding a working fluid introduced from a tank (not shown) or the like storing a working fluid to the steering pump 100 is formed at one side of the cap 190. Of course, the suction port 193 may also be formed in the housing 110 as needed. The cap 190 is preferably molded of a plastic composite material to reduce weight.

In addition, the gear pump module 130 described above has been described as an embodiment and may be modified in various forms.

The effect of reducing the pulsation according to the flow path of the steering pump 100 according to the present invention having such a configuration will be briefly described as follows.

First, in the gear type steering pump 100, the discharge amount of the pump gear 135a is repeatedly increased or decreased due to the characteristics thereof, and the increase or decrease of the discharge amount leads to the pulsation of the steering pump 100. [ On the other hand, the pulsation on the discharge side leads to the pulsation on the suction side. In order to prevent the pulsation of the suction side or the discharge side, a working fluid stored in a large space has a large space on the flow path through which the working fluid is sucked or discharged, thereby reducing such pulsation. It is possible to prevent the pulsation from being transmitted to the other flow channel.

That is, in the process of sucking the working fluid into the pumping part 135, the working fluid in the narrow suction port 193 is guided to the first suction fluid buffer part 195a, which is a large storage space, Is guided to the second suction fluid buffer part 195b which is a large space by the narrow upper and lower suction flow path 117b.

The stored fluid in the second suction fluid buffering portion 195b is pressurized in the pumping portion 135 through the central suction flow passage 117c formed in the central region of the partition wall member 117 so that the narrow buffered portion suction port And is guided to the discharge port 119 of the steering pump 100 through the narrow buffer part discharge port 119 so as to operate with the pressurized working fluid. do. In other words, the volume of the flow path of the working fluid can be largely changed to prevent pulsation on the discharge side or the suction side in the greatly changed working fluid.

Thus, the pulsation of the working fluid sucked or discharged into the pumping section 135 can be effectively reduced through the suction member cushions 195a, 195b and the pressure cushioning section 132. The suction member buffering portions 195a and 195b can utilize the space formed by the pump housing, the cap 190 and the housing cover 180 as much as possible, and the pressure buffering portion 132 is formed in the pump housing 110 So that the steering pump 100 can be more compactly formed.

The motor module 150 is coupled to or supported by the motor module receiving portion 115 of the housing 110. The motor module 150 includes a stator 153 that is provided to be able to supply current by an external power source and is supported by the housing 110 and a stator 153 that is rotatable in correspondence with the stator 153, And a rotor 155 coupled to the partition wall member 117 and having a permanent magnet 157 and a rotary shaft 151. And the outer side of the permanent magnet 157 includes an exposed portion 157a which is exposed to the outside of the length corresponding to the stator 153. [

Since the stator 153 is the same as the general motor module 150, a detailed description thereof will be omitted below.

The rotor 155 has a yoke 158a coupled to the rotating shaft 151 and a slot 158b in which the yoke 158a is provided with a permanent magnet 157 therein.

That is, when the permanent magnet 157 is embedded in the slot 158b, at least one end of the permanent magnet 157 is moved along the axial direction of the rotary shaft 151 as shown in FIG. 4, And a protruded exposed portion 157a (see the right side view 'X' in FIG. 4). That is, the exposed portion 157a of the permanent magnet 157 is an area protruded by the length 'X' from the length of the stator 153 (see 'Y' in FIG. 4) in FIG.

The exposed portion 157a may be exposed only to the left side as shown in FIG. 4 or may be exposed only to the right side as well as both left and right sides if necessary.

The motor module 150 according to the present invention is a BLDC motor. In this case, since a current must be supplied to each terminal according to the output of the Hall sensor 159, a substrate (not shown) . 6, the substrate is spaced apart from the rotor 155 and the stator 153. However, according to the present invention, a separate substrate is not required.

The Hall sensor 159 senses the rotation of the protruding portion 157a of the permanent magnet 157 which is fixed to the stator 153 or a fixed member (not shown) It is possible to detect the angle or phase of the permanent magnet 157 at the same position as the position of the magnet 157, thereby preventing or eliminating an error detecting the permanent magnet 157. [ The amount of current applied from the stator 153 can be adjusted based on the position of the permanent magnet 157 without error detected by the Hall sensor 159 and the like so that the rotation speed, The efficiency of the motor that can be controlled can be increased and the reliability can be improved. The improvement of the efficiency of the motor module 150 is directly related to the improvement of the efficiency of the steering pump 100 and the speed control of the motor module 150 is precisely performed, Can heal.

The manufacturing process of the motor module 150 according to the present invention having such a configuration is the same as the general manufacturing process and only the permanent magnets protrude from the stator without being embedded in the slots of the rotor, The description will be omitted.

5 (b) and 5 (a) show waveforms sensed by the hall sensor 159 in the motor module 150 according to the present invention and the conventional motor. The waveform sensed by the Hall sensor according to the prior art shown in FIG. 5 (a) has N-pole, S-pole noise or interference of a short waveform between long and short waveforms in which the N-pole and S- The waveform sensed by the hall sensor 159 of the rotor 150 can be detected only in the N pole long waveform and the S pole long waveform so that the position or angle of the permanent magnet of the rotor can be detected without any noise have. Therefore, according to the present invention, the position of the permanent magnet 157 and the like can be detected by the hall sensor 159 without noise, and the sensed signal can be sent to the control unit. Thus, the operation of the motor module 150 according to the present invention Can be made more efficient and stable.

Therefore, according to the present invention, the permanent magnet embedded in the rotor can be detected without any error in the Hall sensor, the number of parts can be reduced, the material cost and manufacturing cost can be reduced, Thereby improving efficiency, reliability, and the like.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the invention. will be. The scope of the invention will be determined by the appended claims and their equivalents.

100: gear type steering pump device 110: housing
113: Gear pump module accommodating part 115: Motor module accommodating part
117: partition wall member 117a:
117b: upper and lower suction flow path 117c:
119: Outlet
130: Gear pump module 131: Gear pump housing
131a: inner wall 131b: outer wall
131c: inclined portion 131d: housing of the gear pump
132: pressure buffering part 133: gear pump cover
135: pumping section 135a:
135b: gear housing 137: gear pump rotating shaft
137b: Rotation speed of gear pump 139: Relief valve
139a: pump module fixing member
150: motor module 151:
153: stator 155: rotor
157: permanent magnet 158a: yoke
158b: Slot 159: Hall sensor
170: driving circuit module 173: driving circuit module supporting member
175: Driver circuit member 177:
180: housing cover 190: cap
193: Suction port 195a: First suction fluid buffer
195b: second suction fluid buffer

Claims (4)

A gear pump module supported on one side of the housing to pressurize the fluid and a motor module supported on the other side of the housing to provide a driving force to the gear pump module, In the permanent magnet motor,
The motor module includes a stator supported by the housing to allow current to be supplied by an applied power source, a rotor having a motor rotation shaft rotated by the stator and a permanent magnet generating a magnetic force,
Wherein the permanent magnet is embedded and protrudes more than a length corresponding to the stator. The method according to claim 1,
And a hall sensor for detecting the position of the protruded permanent magnet is coupled to one side of the stator. A housing forming an appearance;
A gear pump module supported on one side of the housing to pressurize the fluid;
And a motor module supported on the other side of the housing to provide driving force to the gear pump module,
The motor module includes a stator supported by the housing to allow current to be supplied by an applied power source, a rotor having a motor rotation shaft rotated by the stator and a permanent magnet generating a magnetic force,
Wherein the permanent magnet is embedded and protrudes more than a length corresponding to the stator. The method of claim 3,
And a hall sensor for detecting the position of the protruding permanent magnet is coupled to one side of the stator.

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