JPH0595657A - Electric motor with frequency generator - Google Patents

Abstract

PURPOSE:To offset influence of a magnetic field so as to reduce the bad influence of the leakage field on the output voltage by point-symmetrically setting an angular regional part equivalent to the angular regional part, where a generator winding can not be set because of the arrangement of lead-out wires of a stator winding and a field detecting element, on the opposite side. CONSTITUTION:Letting the angular region where a generator winding 10-0 can not be annularly provided because of providing lead-out wires 11 of the stator winding and a field detecting element, be theta1, formula [I] is realized. In formula [I], (n) is the number of generator windings which can not be provided in the angular region theta1, and 2P is the number of poles of the generating permanent magnet of the rotor. Let the angular region provided in a position which is the point-symmetrical position of the angular region theta1 with respect to the center of the annular generator winding be theta2, and let the pitch of the generator winding provided in the angular region theta2 be theta3, which is expressed by formula [II], where m is an integer (1, 2, 3,...). And the number of generator windings N arranged at the pitch theta3 in the angular region theta2 is N=2mX2. In this way, power generation by the field of the generating permanent magnet is offset.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor with a frequency generator used for a VTR or the like, and more particularly to a frequency generator winding.

[0002]

2. Description of the Related Art In a conventional electric motor with a frequency generator,
When arranging a stator winding or the like and a lead wire of a magnetic field detecting element on a printed wiring board, as described in Japanese Utility Model Application Laid-Open No. 2-60470, two angular regions where the power generating winding is not provided are symmetrical. In order to reduce the adverse effect on the output voltage of the power generation winding due to the misalignment of the power generation winding or the permanent magnet for power generation.

[0003]

The above-mentioned prior art is a means for reducing the adverse effect on the output voltage when there is no power generation winding. However, regarding the adverse effect on the output voltage due to the leakage magnetic field of the permanent magnet for driving the motor, Reduction measures were not considered.

The present invention has been made to solve such a problem.

[0005]

The above-mentioned problems are point-symmetrically opposed to the angle region part equivalent to the angle region part where the generator winding cannot be installed due to the arrangement of the stator winding and the lead wire of the magnetic field detecting element. It is achieved by setting the power generation winding pitch of the set portion to the side and canceling each other when receiving the magnetic field of the permanent magnet for power generation so as not to generate power.

[0006]

In the printed wiring board of the electric motor with frequency generator of the present invention, the angle region where the generator winding is not provided in an annular shape is θ ₁ because the stator winding and the lead wire of the magnetic field detecting element are provided. However, n = the number of power generation windings that cannot be provided in the angle region θ ₁ and 2P = the number of poles of the rotor permanent magnet for power generation, and the angle region θ ₁ is located at a point symmetrical position with respect to the center of the annular power generation winding. The angle region provided at is defined as θ ₂ .

If the pitch of the power generation windings provided in the angle region θ ₂ is θ ₃ , However, m = 1, 2, 3, ...
The generator windings N of placing at the pitch theta ₃ in ₂ N = 2m × ₂ (number) provided.

From the above, θ ₃ becomes an even-numbered pitch of the magnetic pole pitch of the permanent magnet for power generation. Therefore, the N power generation windings arranged at the θ ₃ pitch in the angular region θ ₂ generate power by the magnetic field of the power generation permanent magnet between the power generation windings arranged at the magnetic pole pitch intervals of the power generation permanent magnet. Since they act so as to cancel each other, the output voltage of the generator winding is not adversely affected. In addition, part of the arc connecting the straight part of the power generation winding can be installed on the inner diameter side like other normal power generation winding pitch parts, so that the component superposition due to the leakage magnetic field of the drive permanent magnet is superimposed. Can be reduced.

Even if the N power generating windings are provided in M sets, the same operation as described above is performed, and therefore, the component superposition due to the leakage magnetic field of the driving permanent magnet can be reduced without adversely affecting the output voltage of the power generating winding. Like

[0010] M = 1, 2, 3, ... Integer.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, 1 is a printed wiring board, 2 is a stator winding in which a driving coil is wound around a core, and 3 is a magnetic field detecting element for detecting the position of the rotor 4, which is a stator winding. The wire 2 and the magnetic field detection element 3 are arranged on the printed wiring board 1 and attached to the fixed drum 7. Reference numeral 8 is a bearing attached to the fixed drum 7, 9 is a rotor shaft, 5 is a driving permanent magnet fixed to the rotor 4, 6 is a permanent magnet for a frequency generator integrally molded with the driving permanent magnet 5. Yes, permanent magnet for frequency generator 6
The rotor 4 is attached to the rotor shaft 9 so as to face the printed wiring board 1 with a gap therebetween to form a motor with a frequency generator.

In the electric motor with frequency generator configured as described above, the magnetic flux of the driving permanent magnet 5 is detected by the magnetic field detecting element 3, and the output of the magnetic field detecting element 3 causes the stator winding through the energization control device (not shown). When electric power is applied to the wire 2, the torque is obtained and the rotor 4 rotates. Next, FIG. 4 is a plan view of the printed wiring board 1, and 10 is a plurality of linear power generation lines formed on the printed wiring board 1 and extending in the radial direction at equal pitches are connected in series with each other. An annular power generation winding, the magnetic flux of the frequency generator permanent magnet 6 is applied to this power generation winding 10.
Interlinking occurs according to the rotation of the rotor 4, and an AC voltage having a frequency proportional to the speed of the rotor 4 is generated to control the rotation speed. 1
1 is a lead wire of the stator winding 2 and the magnetic field detecting element 3, 1
0-0 is a portion where the power generation winding 10 is not provided because the lead wire 11 is provided, and a portion 1 where the power generation winding 10 is not provided
Let θ _{1 be} the angle region of 0-0 However, n = the number of power generation windings 10 that cannot be provided in the angular region θ ₁ and 2P = the number of poles of the permanent magnet 7 for power generation of the rotor 4, and θ _{1 at} the center of the annular power generation winding 10 The angle region of the point symmetric position 10-1 is set to θ ₂ .

Power generation winding 10 provided within the angle region θ ₂ .
If the pitch of is θ ₃ However, m = 1, 2, 3, ...
_{The number of} power generation windings N arranged at the pitch θ _{3 in} 2 is N = 2m × 2 (number), and M sets of N power generation windings are provided.

[0015] M = 1, 2, 3, ... Integer.

As in the example of FIGS. 3 and 4, n = 2,
2P = 24, m = 1 And the angle regions θ ₁ and θ ₁ where the power generation winding 10 is not provided
It said annular center angular region theta ₂ is 45-degree point symmetry positions of the power generation winding 10 to the pitch of the power winding 10 in the theta ₂ theta
₃ is 7.5 degrees, which means that one set of four power generation windings 10 is provided.

In the above-mentioned electric motor with frequency generator, the generator windings within the angle region θ ₂ are 10-a, 10-b, 10-.
c and 10-d, when power is generated in 10-a, the power is generated in the power generation winding 10-c provided at a position where the magnetic pole pitch of the permanent magnet for power generation is 15 degrees with respect to the power generation winding 10-a. The power generation windings 10-a and 10-c cancel the power generation with each other because the power generation windings 10-a and 10-c generate power in the same size as the winding 10-a but in the opposite direction. In the power generation windings 10-b and 10-d, the power generation winding 1 is also used.
Similar to 0-a and 10-c, since the power generations cancel each other, the output voltage of the power generation winding is not adversely affected. Further, the arc portion connecting the power generating windings 10-a and 10-b and 10-c and 10-d in the angle region θ ₂ is the same as the other normal power generating winding pitch portions on the inner diameter side. Therefore, it is possible to reduce the component superposition due to the leakage magnetic field of the drive permanent magnet 5 arranged on the inner diameter side of the power generation permanent magnet 6.

[0018]

In the motor with frequency generator, the output voltage is not adversely affected by the misalignment of the generator winding or rotor permanent magnet for the generator provided on the printed wiring board. Further, the adverse effect on the output voltage due to the leakage magnetic field of the permanent magnet for driving the electric motor can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric motor with a frequency generator showing an embodiment of the present invention.

FIG. 2 is a plan view of a conventional frequency power generation winding.

FIG. 3 is a plan view of a frequency generating permanent magnet showing an embodiment of the present invention.

FIG. 4 is a plan view of a frequency power generation winding showing an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Printed wiring board 2 ... Stator winding 3 ... Magnetic field detection element 4 ... Rotor 5 ... Driving permanent magnet 6 ... Frequency generating permanent magnet 7 ... Fixed drum 8 ... Bearing 9 ... Rotating shaft 10 ... 10-2・ 10-3 ・ 10-a ・ 10-b ・ 1
0-c · 10-d ... Power generation winding 10-0 ... Area where power generation winding is not provided 10-1 ... 10-0 point-symmetrical portion 11 ... Leader wire of magnetic field detection element or stator winding

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Nagata 1410 Inada, Katsuta City, Ibaraki Prefecture, Nitta Manufacturing Co., Ltd.Tokai Factory (72) Inventor Hisahiro Miki 1410 Inada, Katsuta City, Ibaraki Hitachi, Ltd. Tokai Factory

Claims (2)

[Claims] 1. A stator having a drive winding arranged on a printed wiring board, a rotor having a permanent magnet facing the stator via a gap, and a rotor formed on the printed wiring board, etc. From a ring-shaped power generation winding in which a plurality of linear power generation lines extending in the radial direction at a pitch are connected in series to each other, and a power generation permanent magnet provided in the rotor so as to face the power generation winding with a gap. In the electric motor with a frequency generator consisting of, since the lead wire of the stator winding or the like is provided on the printed wiring board, the angle region θ ₁ where the annular power generating winding is not provided is set. However, when n = the number of power generation windings that cannot be provided in the angle region θ ₁ and 2P = the number of poles of the rotor permanent magnet for power generation, the angle region θ ₁ and the center of the annular power generation winding On the other hand, at the point symmetry position, the pitch θ ₃ of the generator winding in the same angle range θ ₂ as θ ₁ is set. However, it is characterized in that it is set as an integer of m = 1, 2, 3, ... And N = 2m × 2 (pieces) of power generating windings N arranged at the pitch θ ₃ in the angular region θ ₂ are provided. Electric motor with frequency generator. 2. The electric motor with frequency generator according to claim 1, wherein the generator winding N is arranged at a pitch θ ₃ within an angular region θ ₂ .
An electric motor with a frequency generator, characterized in that M sets are provided. M = 1, 2, 3, ... Integer.