JPH03265454A - Commutator motor fan - Google Patents

Abstract

PURPOSE:To increase rotary torque and to improve efficiency by winding a winding, with no gap, between a plurality or ribs formed between the slots of the rotor of a motor thereby decreasing the magnetic resistance. CONSTITUTION:The shaft 22 of a rotor 21 is born rotatably by a bearing 23 supported on a bracket 24 at the opposite side to a load and a bearing 23' supported on a load side air guide 27 and the rotor 21 is rotated, together with a fan 28, with respect to a stator 25. A plurality of ribs 26 (3 pcs. shown) in figure are formed at the inside of the slot 21b of the rotor 21. A winding W is wound, while being arranged, between the ribs 26 and between the rib 26 and the wall of the slot 21b with no gap between the windings W thus decreasing the magnetic resistance and increasing the flux density. A wedge 32 composed of a material having high permeability is inserted into the opening of the slot 21b.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a commutator electric blower.

2. Description of the Related Art Conventionally, this type of electric blower is disclosed in, for example, Japanese Patent Application Laid-Open No. 64-187.
The configuration was as described in Publication No. 64.

Furthermore, the details are explained in Fig. 30 and Fig. 4.
The outer frame is formed by a load side bracket (made of metal) 2 and an anti-load side bracket (made of metal) 3, and a shaft 4 that rotates toward the load side bracket 2 protrudes, to which a rotating fan 6 is fixed with a nut 6. An air guide is attached to the outer periphery and lower part of the fan 6, and a casing 8 covers the front of the fan 6, and an intake port 8a is opened in the center of the casing 8, facing the intake port θ& of the fan 6. I'm doing this.

The load-side bracket 2 has an opening 2a, and the anti-load-side bracket 3 has an exhaust port 3a.

The motor 1 has a rotor 9 and a stator 10.
An armature winding 9a is wound around the rotor 9, and a winding 10a is wound around the stator 10. t, below the rotor 9 is the armature winding 9a.
A commutator 11 connected to the shaft 4 is fixed to the shaft 4 so as to be able to slide in contact with a carbon blank 13 in a brush holder -12 fixed below the anti-load side bracket 3. In addition, the rotor 9 is formed with a slot 14, which means that the current supplied from the external power source reaches the carbon brush 13 from the spooler winding 10a, and then passes through the commutator 11 to the armature winding 9a. It will flow. Therefore,
Since the current generated from the stator 10 is perpendicular to the current flowing through the armature winding 9a of the rotor 9, rotational torque is generated in the armature winding 9a according to Fleming's left-hand rule, and as a result, the rotor 9 rotates.

Problems to be Solved by the Invention However, in a motor with this type of structure, the windings wound around the slots of the rotor are wound randomly, and as shown in Figure 1, there are gaps between the windings. Therefore, the magnetic flux generated in the stator is weakened by this air gap, which causes a decrease in motor efficiency.

Particularly when trying to improve the efficiency of a motor, if the windings are made thicker in order to reduce copper loss, the gaps between the windings become larger, which reduces the effectiveness of the windings.

Therefore, in the present invention, by forming a large number of ribs in the slots of the rotor and winding the windings in a line between them, the gaps between the windings can be eliminated and the magnetic flux generated in the stator can be weakened. Since this eliminates the problem, the efficiency of the motor can be improved.

Means for Solving the Problems The present invention provides a fan that rotates together with a stator, a rotor, and a hero rotor, an air guide that is provided below the fan and holds a bearing on the load side of the rotor, and a bearing on the opposite load side of the rotor. t generated by the stator on the core of the stator, which is configured with a counter-load side bracket and is fixed to the counter-load side bracket, facing the core of the rotor.

This is a commutator electric blower in which a plurality of coils are arranged so as to guide magnetic flux toward the rotor.

Effect: With the above-mentioned means, a large number of ribs are formed in the slot of the rotor that constitutes the motor, and the windings are wound in a line between them, so there are no gaps between the windings. , does not weaken the magnetic flux generated in the stator.

φ-BxS (B: magnetic flux density, S: area where magnetic flux passes)
Since S is constant, φoL:B becomes, so the rotational force F == BILS:INθ (B: magnetic flux density, ■: current, L: length of copper wire) acting on the rotor increases.

Therefore, if the power consumption is the same (the current value is the same) and the length of the rotor is the same, the rotational force F can be increased by increasing the magnetic flux density B that interlinks with the windings of the rotor. Therefore, the efficiency of the motor can be improved.

In other words, the motor output P is P0=1.028NT (W
), (N: number of rotations, T: )A/ri).

Here, since it is T■F, if the magnetic flux density B (φcf-B) is large, the motor output P0 becomes large, and the motor output can be improved.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 21 denotes a rotor, bearings 23 are press-fitted onto both sides of a shaft 22, and one of the bearings 23 is held by a bracket 24 on the opposite load side. An exhaust port 24a is opened below the anti-load side bracket 24.

Further, the anti-load side bracket 24 holds the outer periphery of the stator 26 at its center. The stator 25 has a winding 25 that generates a magnetic field to rotate the rotor 21.
A is wrapped.

Winding wires 21a are wound around the rotor 21 in four rows between ribs 26 formed in slots 21b.

On the load side, the bearing 23 of the rotor 21 is held by an air guide 27. A shaft 22 protrudes from the load side of the rotor 23 through an air guide 27, and a fan 28 is fixed thereto with a nut 29.
Rotates with 1. Casing 3o above the fan 28
is covered, and an intake port 30a is opened in the center thereof opposite to the intake port 28a of the fan 28.

Next, the operation in the above configuration will be explained.

In FIG. 7, when an alternating current voltage is applied to the motor 31 and an alternating current flows through the windings 25a constituting the stator 25, magnetic flux for rotating the rotor 21 is generated.

At this time, the magnetic flux interlinks with the winding 21& wound around the rotor 21, so a force acts on the winding 21a.

This side F can be expressed by the following formula. F = Bx I XLS
IIIθ (B: magnetic flux density, I: current, L: length of copper wire)
.

Here, B-φ/S (φ: magnetic flux, S: area through which the magnetic flux passes), and since S is constant, Bocφ is obtained, and the efficiency of the motor 31 can be improved by increasing φ. However, in conventional motors, the windings are randomly wound around the rotor, resulting in gaps between the windings. Therefore, this gap acts as a resistance in the magnetic circuit, weakening the magnetic flux and reducing the efficiency of the motor.

Therefore, in the motor 31 of the present invention, a large number of ribs 26 are formed on the thrower 21b of the rotor 21.
Since the winding wire 21a is wound in a line between the
There is no gap between the windings 2Ia. Therefore, the magnetic flux generated in the stator 26 will decrease by 1 to no.

That is, by eliminating the gap between the windings 21a, the magnetic resistance in the magnetic circuit of the motor 31 is reduced. The magnetic flux φ is φ= f/r=μsNI/L (f
: Magnetomotive force, r: Magnetic resistance, number of turns of N-scheetah, I
: current, S: cross-sectional area of the iron core, L: length of the iron core), so as the magnetic resistance T becomes smaller, the magnetic flux φ becomes larger (f is constant at f=NI). Therefore, the magnetic flux density B
becomes larger.

The rotational force F is F=BILs+nθ(B
: Magnetic flux density, ■ = current, L: length of copper wire), if the power consumption is the same and the length is the same, the rotational force F is,
Since it is determined by the magnitude of magnetic flux density, with the motor of the present invention, greater rotational force can be obtained with the same power consumption.

Here, the output P0 of the motor is P0=1°026NT
(W), (N: rotation speed, T: torque). Further, since the torque T has a relationship of ToCF, the output P0 of the motor is proportional to the magnetic flux density B.

Further, in order to further reduce the magnetic resistance r, the wedge 32 is made of a material with good magnetic permeability.

Further, since the magnetic flux also passes through the ribs 26, the magnetic resistance r is further reduced, and efficiency can be improved. As shown, the motor of the present invention can realize a highly efficient motor using a relatively simple method.

Effects of the Invention The present invention forms a large number of ribs in the slot portion of the motor rotor, and winds the windings in a line between the ribs, thereby eliminating gaps between the windings and improving the performance of the motor. By decreasing the magnetic resistance and increasing the magnetic flux φ, the rotational torque of the rotor can be increased. Therefore, it is possible to obtain a larger motor output with the same power consumption, making it possible to realize a highly efficient motor.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a motor showing an embodiment of the present invention, and FIG.
FIG. 3 is an enlarged sectional view of a portion of the rotor of the same motor, FIG. 3 is a sectional view showing a conventional motor, and FIG. 4 is an enlarged sectional view of a portion of the rotor of the conventional motor. 21... Rotor, 21a... Rotor winding wire, 21b... Slot, 24...
・Anti-load side bracket, 25...Stator,
25a... Stator winding, 26...
Rib, 27... Air guide.

Claims (1)

[Claims] It consists of a stator and a rotor, a fan that rotates together with the rotor, an air guide provided below the fan and holding a bearing on the load side of the rotor, an anti-load side bracket holding a bearing on the anti-load side of the rotor, and A commutator electric blower in which a large number of ribs are provided between the slots, and a rotor winding is wound in a line between the ribs.