JPS60226790A - Dc commutatorless motor - Google Patents

Abstract

PURPOSE:To obtain a sufficient starting torque without varying the hardware structure of drive means by conducting in bidirections a stator winding in 3 conduction modes. CONSTITUTION:A position detection signal which varies at level in 3 stages depending upon the rotary position of a motor from a Hall IC6 is output, this signal is distributed by a distributor 100, and a conditioning process is performed by a signal processor 200 to a drive signal generator 300. A slope generator 500 generates a sawtooth wave synchronized with the output signal of a generator winding 7 and a delay pulse to the generator 300. The generator 300 forms 3-phase drive signal for conducting in bidirections in stator windings 1-3 in three conduction modes on the basis of a rotary position detection signal supplied from the circuit 200, a sawtooth wave supplied from the generator 500 and a delay pulse to a drive circuit 700.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a relatively small-capacity non-commutator motor used under a DC power source, and is particularly applicable to recording/reproducing devices such as video recorders and air-cooling fan motors. The present invention provides a DC commutatorless motor suitable for use as a motor.

Conventional configurations and their problems In recent years, DC non-commutator motors have come into widespread use in many audio equipment, video tape recorders, and even floppy disk drives. Even the motor uses a DC non-commutator motor.

Conventionally, a two-phase or three-phase half-wave drive system or a full-wave drive system has been the mainstream for this type of DC non-commutator motor.

Each drive system has its advantages and disadvantages; for example, a three-phase drive system requires fewer drive power elements than a two-phase drive system, but on the other hand, it requires fewer position detection elements to detect the rotational position of the rotor. are required.

By the way, if you compare the two-phase full-wave drive type with a single power supply, eight power transistors and two Hall elements are required, and the three-phase full-wave drive type requires six. A power transistor and three Hall elements are required.

Conventionally, many attempts have been made to reduce the number of position detection elements in three-phase drive force systems, and a representative technique is the one described in U.S. Patent No. 3,577.053 (hereinafter referred to as
This is referred to as Document 1. ) is disclosed.

The above-mentioned document 1 describes that in a three-phase half-wave drive type non-commutator motor, first, second, and third lights having different light reflectances are mounted on the rotor.
An identification band having the following components is provided, a light beam is irradiated onto the identification band, and the reflected light is detected by a light receiving element, whereby a change in the rotational position of the rotor is recognized as a three-step change in the output level of the light receiving element. , a device configured to energize phase windings in dependence on their level is shown.

Furthermore, if the light beam is incidentally irradiated onto the boundary between the first and third components when the rotor is started, the output level of the light receiving element will take an intermediate value, so it will appear as if the light beam is in the second configuration. The detection circuit operates as if it had detected the element part,
This leads to generation of reverse torque and vibration of the rotor, but it is explained that in order to prevent this, the output level discrimination circuit section of the light receiving element can be configured with a Schmitt circuit.

The same thing applies to patent application publication No. 46317 of 1982.
Publication No. (hereinafter referred to as Document 2), and in Document 2, instead of the Schmitt circuit, the third
A drive circuit device is shown that is provided with a memory circuit for storing detection of a component part of.

In both Documents 1 and 2, three-phase half-wave drive is possible using a unique position detection element and an identification band for position detection, but phase winding is possible without using any special position detection element. (Methods have also been proposed and put into practical use. (For example, CX20114, a 3-phase commutatorless motor drive IC manufactured by Sony.) , Reference 3), the energization state of each phase winding is initially switched by the output signal of a self-propelled three-phase multivibrator, and after the rotor starts rotating, the energization state of the three-phase stator is switched. A drive circuit device is shown that is configured to switch the energization state of each phase winding using a power generation waveform appearing in an idle winding among the windings.

However, in the method shown in Document 3, since the windings of each phase are first energized indiscriminately, reverse torque may occur instantaneously or sufficient starting torque may not be obtained, causing the motor to energize. There is a disadvantage that it takes a long time for the rotation speed to reach the desired rotation speed.

By the way, although the non-commutator motors shown in Documents 1 and 2 are both three-phase half-wave drive types, their drive form is limited to the three-phase half-wave type due to structural constraints.

In other words, if we take the format shown in Document 1.2 above, 36
Since only three types of detection can be performed per 0° electrical angle,
Inevitably, only three ways of switching the energization state to each phase winding are allowed, and in order to realize a three-phase full-wave drive force type that requires switching of the energization state in six ways, additional positions are required. Requires detection element and identification band.

Purpose of the Invention The present invention is to realize a DC non-commutated motor with a simplified rotor rotational position detection mechanism.Specifically, when starting the rotor, all three phases can be detected by simply switching energization in three ways. The system is started with a rotational torque comparable to that during driving, and after the rotational speed of the rotor has increased to a certain extent, it is possible to operate with three-phase full-wave drive with less torque ripple based on rotational information.

Structure of the Invention The DC non-commutator motor of the present invention includes a three-phase stator winding,
a rotor including a permanent magnet having a plurality of magnetic poles facing the stator winding; a position detection element for detecting the rotational position of the rotor; and a position detection element for detecting the rotational position of the rotor. an annular identification band having a plurality of components that produce output states of different levels; and a power generation element disposed on the stator at a position facing the rotor, the number of which is an integral multiple of the number of magnetic poles of the permanent magnet. a power generating body having a generator, a driving means for supplying current to the stator winding, and a first and second driving mode, the driving mode being switched by an external input signal, and in the first driving mode. The drive means is operated in three energization modes according to the output of the position detection element to bidirectionally energize the stator winding, and in the second drive mode, the output signal from the power generator is The stator winding is characterized by comprising a drive signal generation circuit that operates the drive means in six energization modes that are switched each time a predetermined edge of , and causes the stator winding to be energized in both directions. In particular, in the first drive mode, by bidirectionally energizing the stator winding in three energization modes, sufficient starting torque can be obtained without changing the hardware configuration of the drive means. It is novel in that it is configured as follows.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic diagram of a motor configured to carry out the present invention, in which three-phase stator windings 1, 2, .
3 are star-connected to each other, and a permanent magnet 4 mounted on a rotor (not shown) is placed opposite the stator windings 1 to 3.

The main part of the permanent magnet 4 is occupied by a main magnetic pole magnetized into eight poles, and the inner peripheral part thereof includes a first component part magnetized with an N pole (indicated by the N symbol in the figure). ) the unmagnetized second component part (indicated by the Z symbol in the figure), and the third component part which is S-pole magnetized (indicated by the S symbol in the figure). ) has an annular identification band 5.

Also, a Hall IC (an integrated circuit in which a Hall power generator and other circuits are co-located on a chip, generally a Hall IC
It is called C or Hall switch. ) 6 are placed.

On the other hand, a zigzag-shaped power generation winding 7 having 24 power generation element portions that is diffracted in the radial direction is disposed facing the inner circumferential side of the main magnetic pole of the permanent magnet 4. is a non-magnetized portion for generating an alternating current signal of 12 cycles per rotation of the rotor in the power generation winding 7 (even if it is not non-magnetized, it is magnetized so that the magnetic flux density suddenly decreases, Alternatively, depressions may be provided at eight locations.

Furthermore, the lead wires of the stator windings 1 and 2.3 are connected to the first power supply terminal U, the second power supply terminal V, and the third power supply terminal W, respectively, and the center point of the star-shaped wire connection is the terminal X. It is connected to the.

The Hall IC 6 has a positive power supply terminal 6a, a negative power supply terminal 6b, and an output terminal 6c, and the lead wires of the power generation winding 7 are connected to output terminals 7a and 7b.

Now, FIG. 2 shows a block diagram of a DC non-commutator motor according to an embodiment of the present invention, and in FIG. This is what I did.

That is, in the motor block 10, the midpoint terminal
A current limiting resistor 8 is connected between the positive power supply terminal 6a of the Hall IC 6 and the negative power supply terminal 6b of the Hall IC 6, and one output terminal 7b of the power generation winding 7 is commonly connected to the ground terminal G. The output terminal 6c of the Hall IC 6 is connected to the position detection terminal P, and the other output terminal 7a of the power generation winding 7 is connected to the rotation detection terminal F.

A position detection signal whose level changes in three stages depending on the rotational position of the motor is outputted to the position detection terminal P by a processing circuit to be described later, and this position detection signal is divided into three signals by a distributor 100. Line 100n, 100s,
100z, and the conditionality is further processed by the sequential circuit 200 and sent to the drive signal generation circuit 300.

On the other hand, the signals appearing at the rotation detection terminal F and the ground terminal G are amplified to a sufficient amplitude by an amplifier 400 and then supplied to a slope generation circuit 500, and are also sent to the A terminal as a speed detection signal for the rotation servo of the motor. The signals supplied and appearing on the signal lines 100n and 100s are extracted once per rotation of the motor by an extraction circuit 600, and are also supplied to the B terminal as a position detection signal for the rotation servo of the motor.

Although the present invention does not refer to the motor rotation servo system, here, the error is sent to the drive signal generation circuit 300 via the E terminal based on the speed information and position information obtained from the A terminal and B terminal. The voltage shall be returned.

Now, in the slope generation circuit 500, the power generation winding 7
A sawtooth wave and a delay pulse are generated in synchronization with the output signal of and supplied to the drive signal generation circuit 300, respectively.

A sawtooth wave and a delay pulse synchronized with the output signal are generated and supplied to the drive signal generation circuit 300, respectively.

Furthermore, the drive signal generation circuit 300 generates a three-phase winding drive signal based on the rotational position detection signal supplied from the sequential circuit 200 and the sawtooth wave and delay pulse supplied from the slope generation circuit 500. is generated and sent to the drive circuit 700.

The drive circuit 700 amplifies the current of the winding drive signal, and then energizes the three-phase stator windings 1 to 3 via the U terminal, the ■ terminal, and the W terminal.

Note that the J terminal is a terminal to which a command signal for stopping and rotating the motor is supplied, and this command signal is supplied to the sequential circuit 200 and the drive circuit 700, but in the embodiment, the J terminal is set to "L". The structure is such that when the voltage is at the level (low potential), the stator winding is not energized, and when the voltage is at the lH+ level (high potential), the stator winding is energized.

In the embodiment shown in FIG. 2, three signal lines 100n, 100s, 1100,
The distributor 100 that distributes a binary signal to z can be easily realized by two comparators having different threshold voltages, and the amplifier 400 is also a simple AC amplifier, so a description of its internal configuration will be omitted here. However, the operations of other circuit blocks will be briefly explained while showing examples of actual circuit configurations.

First, FIG. 3 is a circuit wiring diagram showing a specific example of the configuration of the Hall IC 6, which includes a constant voltage circuit section 61 using a well-known bandgap reference voltage source, etc., and a circuit connection diagram formed on a silicon substrate. It consists of a Hall power generator 62 and other signal processing circuit parts.

The Hall power generator 62 of FIG. 3 is connected to the identification band 5 shown in FIG.
The potential of one output terminal 62a of the Hall power generator 62 rises when the Hall power generator 62 is facing the N-pole magnetized part.
The potential of the other output terminal 62b decreases.

Therefore, the collector potential of transistor 63 decreases,
Since the collector potential of the transistor 64 increases, most of the current flowing into the constant current transistor 65 becomes the collector current of the transistor 66.

In the circuit shown in FIG. 3, the resistance ratio between the resistor 67 connected to the emitter side of the constant current transistor 65 and the resistor 69 connected to the emitter side of the constant current transistor 68 is set to 3:4. Therefore, if the collector current of the constant current transistor 65 is 4·Io, the collector current of the constant current transistor 68 is approximately 3·Io.

Further, a resistor 71 connected to the emitter side of the power receiving transistor 70 constituting the positive side current mirror circuit,
The resistance values of the resistors 74 and 75 connected to the emitter side of the constant current transistors 72 and 73 are set to be equal, and the resistance value of the resistor 77 connected to the emitter side of the constant current transistor 76 is set to be equal to the resistance of the resistor 71. Since the value is set to three times the value, the collector currents of the constant current transistors 72 and 73 are approximately 3·Io at the maximum value, and the collector current of the constant current transistor 76 is approximately Io.

Therefore, 4 of the collector current of the transistor 66 is
3/3 is supplied from the constant current transistor 73, and only the remaining 1/4 is supplied to the first collector 7 of the transistor 78.
8a.

At this time, a current of Io is supplied from the second collector 78b of the transistor 78 to the load resistor 79 connected to the output terminal 6c, and the constant current transistor 7
From 6 to i.

Since the current is supplied, the resistance value of the resistor 79 is set to Ro
When this happens, a potential of 2.Ro appears at the output terminal 6c.

On the other hand, when the Hall power generator 62 faces the S-pole magnetized portion of the identification band 5, most of the current flowing into the constant current transistor 65 flows through the transistor 8.
The collector current becomes 0, currents of 10 also flow through the first collector 81a and the second collector 81b of the transistor 81, respectively, and the current of the second collector 81b is supplied to the current mirror circuit constituted by the transistor 82 and the transistor 83. be done.

Therefore, at this time, the constant current transistor 76
Most or all of the collector current flows into the collector of the transistor 83, and the potential of the output terminal 6C becomes zero.

On the other hand, when the Hall power generator 62 faces the non-magnetized portion of the identification band 5, the transistor 66.80
Since the collector currents of the transistors 66 and 80 are almost balanced, all of the collector currents of the transistors 66 and 80 are supplied from the constant current transistors 72 and 73 and the collector currents of the transistors 78 and 78
．． 81 becomes zero, only the collector current of the constant current transistor 76 is supplied to the load resistor 79, and the potential of the output terminal 6c becomes 1o-Ro.

In this way, the output voltage of the Hall IC 6 changes in three stages depending on the position of the Hall power generator 62 facing the identification band 5.

FIG. 4 shows the relative positional relationship between the main magnetic pole and the identification band of the non-commutator motor configured as shown in FIGS. 1 and 2, and the changes in the position detection signal obtained from the Hall IC 6. The relative rotation angle between the identification band 5 provided on the rotor and the Hall IC 6 placed on the stator is
When the mechanical angle or electrical angle changes as shown in FIG. 4, the output voltage of the Hall IC 6 changes as shown in FIG.
It changes as shown in figure a).

Next, FIG. 5 shows an example of a flowchart when the sequential circuit 200 shown in FIG. 2 is realized by software such as a microcomputer.
At step 01, it is determined whether the signal line 100n in FIG. Move the process, but if not, branch 20
3, it is determined whether the Hall IC 6 is facing the S-pole magnetized portion of the identification band 5, and if yes, the process moves to processing block 204; if not, the process moves to processing block 205. Transfer processing.

In the processing block 202, only one of the three systems of signals supplied to the drive signal generation circuit 300 in FIG. 2, which corresponds to the N-pole portion, is activated. This corresponds to activating only one of the output ports.

When the processing in processing block 202 is completed, processing moves to branch 206 where processing in branch 203 is completed.
Similarly, it is determined whether the signal line 100S in FIG. 2 is in the active state, and if yes, the process moves to the processing block 204, but if not, the determination by the branch 206 is executed again.

In the processing block 204, of the three systems of signals supplied to the drive signal generation circuit 300, only one signal corresponding to the S-pole portion is activated, and when this processing is completed, the processing moves to branch 207.

In the branch 207, the signal line 10o of FIG.
It is determined whether or not z is in the active state, and if yes, the process moves to the processing block 205, but if not, the determination by the branch 207 is executed again.

In the processing block 205, of the three systems of signals supplied to the drive signal generation circuit 300, only one corresponding to the non-magnetized portion is activated, and when this processing is completed, the processing moves to branch 208.

In the branch 208, similarly to the branch 201, it is determined whether or not the signal line 100S in FIG. The determination by branch 208 is executed.

In this way, immediately after the start, the branch 201
Alternatively, the branch 203 may cause the signal line 10 to
The output corresponding to the signal line in the active state among 0n, 100s, and 100z is supplied to the drive signal generation circuit 300, but after that, the processing block 202, the branch 206, the processing block 204, the branch 207, and the Processing block 205, said branch 208
Therefore, the state of the output supplied to the drive signal generation circuit 300 changes only when the signal lines 100n, 100s, and 100z become active in this order.

That is, the sequential circuit shown in FIG. 5 has three output sections that are connected to each other in a ring shape and send out a drive command signal to the drive signal generation circuit 300, that is, the processing blocks 202204 and 205. and the signal line 100
n, 100s.

100z, the sequential circuit changes the output state of the output section only when a pre-sequenced signal line becomes active;
1.203, and when the motor rotor is started, the output state of the sequential circuit is changed to the signal line 100n,
It also includes an initialization circuit that depends on the output state of the distributor 100 to 100s and 100Z.

Now, FIG. 6 shows an example of a hardware configuration of the sequential circuit 200 of FIG. 2, and its basic operation is the same as the flowchart of FIG. 5.

In FIG. 6, each first input terminal 211a
.

212a and the NAND gate (positive logic NAND gate) 211 and 212 whose output terminals are cross-coupled (cross-coupled) connected to each other;
A first logic block 210 configured by a NAND gate 213 connected to the second input terminal 211b of the D gate 211, and a NAND gate 221.2 having the same configuration.
A second logic block 220 based on 22.223 and a third logic block 220 based on NAND gates 231232.233 with the same configuration.
A logic block 230 constitutes a unit, and the second input terminal 212b of the NAND gate 212
and the first input terminal 213a of the NAND gate 213
is supplied with the output of the NAND gate 232, and the output of the NAND gate 232 is supplied to the
The second input terminal 222b of the AND gate 222 and the N
The first input terminal 223a of the AND gate 223 is connected to the N
The output of the AND gate 212 is supplied, and the output of the NAND gate 222 is supplied to the second input terminal 232b of the NAND gate 232 and the first input terminal 233a of the NAND gate 233, thereby forming a sequential circuit. .

Further, the second input terminals 213b, 223b, and 233b of the NAND gates 213.223.233 are connected to input terminals s1, nl, and zl, respectively, which are connected to the signal lines 100s, 100n, and 100z in FIG. , second
Output terminals s2, n2, and z2 for supplying drive command signals to the drive signal generation circuit 300 shown in the figure are respectively connected to the NAN
It is connected to the output terminal of the D gate 211.221.231.

Furthermore, the third input terminals 212c, 222c, and 232c of the NAND gates 212, 222, and 232 are all initialization signal input terminals j1 connected to the J terminal in FIG.
It is connected to the.

Now, an outline of the operation of the sequential circuit shown in FIG. 6 will be explained based on the output waveform of the position detection signal shown in FIG. 4.

As already explained, the signal waveform in FIG. 4 (8) shows the output signal of the Hall IC 6 in FIG. 2, and the signal waveform in FIG. Based on the output signal of the signal line 10 by the distributor 10JI
This is a signal waveform appearing on each signal line after being distributed into 0n, 100s, and 100z.

In the following description of the operation of the logic circuit, positive logic is used in all cases, and it is assumed that each signal line is in an active state when the signal line is at a high potential.

Further, a high potential state is expressed as "H", and a low potential state is expressed as "L".

Now, when the motor rotation is stopped or immediately after the power is turned on, the level of the initialization signal input terminal jl in Fig. 6 is L.
', and the NAND gate 212.222.23
Since the output level of the output terminal n2+s2.z2 is forcibly held at "H", the level of the output terminal n2+s2.z2 is the same as that of the input terminal n1.
s1. It becomes equal to the level of z 1.

Now suppose that the electrical angle of hole lc6 in Fig. 2 is 0 in Fig. 4.
If the output terminal Z is opposite to the position of
2 is level A, and the output terminal n2. The level of s2 becomes L', but this state continues even after the level of the initialization signal input terminal j1 shifts to 18l, the rotor of the motor starts rotating, and the Hall IC 6 moves to the identification band 5.
When facing the N-pole magnetized part of the input terminal zl, the level of the input terminal zl shifts to I L I, and instead the input terminal n
The level of 1 shifts to "H'.

When the level of the input terminal nl shifts to H', the output level of the NAND gate 223 changes to lL since the output level of the NAND gate 212 has become H' before that.
+, NAND gate 221 and NAND gate 2
By inverting the output state of the gate pair by 22, the NA
The output level of the ND gate 221 becomes H', and the previous 12N
The output level of the AND gate 222 becomes L.

Due to the transition of the output level of the front 32 NAND gate 222 to "L", the NAND gate 231 and the NAND gate 2
32 is inverted, and as a result, the level of the output terminal n2 shifts to H' and becomes active, and the level of the output terminal Z2 shifts to L' and becomes inactive together with the output terminal s2. Becomes active.

When the rotor further rotates and the hole lc6 reaches the electrical angle position of 180° in FIG. 4, the level of the input terminal z1 shifts to "H" again as shown in FIG. 4d). At this point, the output level of the NAND gate 222 has shifted to "L2," so no change occurs in the third logic block 230, and the output terminal n2. s2. z2
The output state of will not change either.

Subsequently, when the level of the input terminal s1 shifts to H',
Before that, the output level of the NAND gate 232 is H.
', the output level of the NAND gate 213 shifts to "L", the output state of the gate pair formed by the NAND gates 211 and 212 is reversed, and the level of the output terminal s2 shifts to "H'", The output terminal n2
The level of changes to "L'.

After all, the sequential circuit shown in FIG. 6 has a function of reflecting the input to the output only when the input terminals become active according to the pre-ordered order.

In this way, the input terminal n1. of FIG. s1. z
When a position detection signal as shown in Fig. 4bL c) and d) is supplied to 1, the output terminal n2*s2+
Drive command signals as shown in e) and f)+g) in FIG. 4 are output to z2.

As is clear from FIG. 4, by using a sequential circuit as shown in FIG. 5 or FIG.
It is also possible to store other information in the .

For example, the area around the electrical angle of 540° in the identification band in Figure 4 is magnetized in a pattern different from other parts, but while the motor rotor is rotating, this unique pattern remains in the output state of the sequential circuit. Since it does not affect counterfeiting, it can be actively used for other purposes as described later.

By the way, when the signal waveform of FIG. 4C) is compared with the signal waveform of FIG. 4F), it is found that they are exactly the same.

If the use of the sequential circuit is limited to seven magnetized identification bands as shown in FIG. 4, the detection signal supplied to the input terminal sl in FIG. This means that there is no problem in transmitting the information to

FIG. 7 shows a simplified sequential circuit taking these matters into consideration. In Figure 7, the NA of Figure 6
An inverter 214 is used instead of the ND gate 213, and an inverter 234 is used instead of the gate pair of NAND gates 231 and 232, but their operation is almost the same as that of the sequential circuit shown in FIG. Explanation will be omitted.

Next, FIG. 8 shows a specific circuit configuration example of the slope generating circuit 500 shown in FIG.
The output signal of the amplifier 400 in the figure is supplied to the amplifier 501.
The output is amplified until it becomes a square wave.

At the leading edge of the output signal of the amplifier 501, a first trigger pulse generation circuit constituted by NAND gates 502, 503, and 504 generates a trigger pulse, and at the trailing edge, an inverter 5 generates a trigger pulse.
05. A second trigger pulse generation circuit composed of NAND gates 506, 507, and 508 generates a trigger pulse.

On the other hand, NAND gates 509, 510 . Inverter 51
1° transistor 512, 513, 514, 515, 5
16,517, diode 518. Resistance 519, 520
,521,522.523,524. capacitor 525
constitutes a monostable multivibrator, and the first
The output signal of the second trigger pulse generation circuit serves as a trigger signal for this monostable multivibrator.

Further, the charge/discharge signal waveform of the capacitor 525 is supplied to the first output terminal gl, and the output signal of the monostable multivibrator is supplied to the second output terminal h1 via the inverter 526.

Therefore, when the input terminal f1 is supplied with the signal waveform shown in FIG. 9d), the output terminal g1. The signal waveforms appearing at hl are as shown in Fig. 9 e) and f), respectively.

Note that the signal waveforms in FIGS. 9a), b), and c) are input to the input terminal n of the drive signal generation circuit 300, which will be explained next. s
It shows the drive command signal supplied to L z 3.

Now, before going into a specific explanation of the drive signal generation circuit 300 shown in FIG. 2, the operation of switching the energization state to the stator winding of the DC non-commutator motor shown in FIGS. 1 and 2 will be explained. do.

As is clear from FIGS. 1 and 2, in the DC non-commutator motor described as an embodiment of the present invention, the detection means for the static position of the rotor is an annular ring-shaped motor having three types of components. Since it is only provided with the identification band 5 and only one hole lc6, only three types of identification are possible depending on the resting position of the rotor.

However, as is well known, if three-phase full-wave drive is to be adopted, six types of position detection information are required depending on the stationary position of the rotor.

In the DC non-commutator motor shown in Figure 2, current is supplied to all three-phase stator windings 1, 2, and 3 based on the output signal of Hall LC6 until the rotational speed of the motor increases to a certain extent. This prevents the starting torque from decreasing by causing an extra current to flow, and after the rotational speed of the motor increases and a sufficient signal is obtained from the power generation winding 7, the output signal of the power generation winding 7 and the hall The active signal generation circuit 300 is configured to generate an energization switching signal for three-phase full-wave drive based on the output signal of the IC 6.

The principle of switching the drive mode will be explained using FIG. 10.

Figure 10a) shows the permanent magnet 4 in the motor structure of Figure 1.
Each stator winding 1 when the main magnetic pole of is sinusoidally magnetized
, 2.3 shows the torque characteristics generated when a current is passed through, and the counterclockwise rotational torque is taken as the positive direction.

In Figure 10a), the characteristic curve ua represents the torque generated when a current is passed through the stator winding l in Figure 1 from the U terminal to the X terminal, and the characteristic curve ub represents the stator winding l shown in Figure 1. It represents the torque generated when a current is passed through line 1 from the X terminal toward the U terminal.

Further, the characteristic curve va represents the torque generated when the stator winding 2 in FIG.
It represents the torque generated when electricity is applied from the terminal toward the V terminal.

Furthermore, the characteristic curve wa represents the torque generated when the fixed 1,000-turn n3 shown in FIG. 1 is energized from the W terminal in the direction of the It represents the torque generated when electricity is applied in the direction of the W terminal.

On the other hand, Figure 1C) shows the torque generated in the positive direction when any two phases of the star-connected three-phase stator windings are energized. As is well known, in a three-phase full-wave drive motor, the envelope of these curves is the actual output torque waveform.

That is, in Fig. 1O C), the characteristic curve wv is the first
The characteristic curve Uν represents the torque generated when current flows from the W terminal to the V terminal in the figure, and the characteristic curve Uν represents the torque generated when current flows from the U terminal to the V terminal, and characteristic curve 11W represents the torque generated when current is applied from the U terminal toward the W terminal, and the characteristic curve VW represents the torque generated when current is applied from the V terminal toward the W terminal. vu represents the torque generated when current is applied from the V terminal toward the U terminal, and the characteristic curve wu represents the torque generated when current is applied from the W terminal toward the U terminal.

Assuming that the maximum torque generated by each stator winding is 1, in three-phase full-wave drive, the energization to each stator winding is switched every 60 degrees electrical angle, so the maximum torque after combining Tma++Minimum torque Tm+++Average torque Ta
v is given by the following equation. (Note that here, each torque is expressed as a simple index without a unit.

) 3 2 FIG. 10 d) shows the output signal waveform of the Hall IC 6 already explained, and FIG. 10 e) shows the output signal waveform of the amplifier circuit 501 used inside the slope generation circuit 500. As shown, when the rotor of the motor is stopped, only the output signal of the hall C6 can be used as position detection information.

In order to start the motor using only three types of position detection information, a three-phase half-wave drive may be used, but in that case, the star-connected stator windings shown in Figure 2. A power switching element is required to directly connect the X terminal, which is a point, to the positive or negative feed line.

In the embodiment of the present invention, such inconvenience is solved by the method described below.

That is, in correspondence with the three-stage level change of the output signal of the Hall IC 6, the section where the output signal is at a high potential is set as a first energizing section, the section where the output signal is at a low potential is set as a second energizing section, and an intermediate potential. A certain section is defined as the third energized section, and the
In the energizing section, the U terminal in FIG. 2 is energized to the V terminal and the W terminal, and in the second energizing section, the V terminal is energizing the W terminal and the U terminal, In the energizing section No. 3, electricity is supplied from the W terminal to the U terminal and the V terminal.

At this time, the composite torque characteristics of the three-phase stator windings 1, 2.3 are as shown in FIG. The curve vc represents the torque generated by energization in the second section, and the characteristic curve wc represents the torque generated in the third section.
represents the torque generated by energization in the section.

Therefore, the output torque of the motor when the energization is switched at ideal timing is equal to the envelope of the characteristic curve shown in Figure 10b), and the main winding among the three-phase stator windings is Considering that a current equal to the sum of the two-phase stator winding currents flows, the maximum torque Tma2. Minimum torque Tm12. Subtracting the average torque Tav2 results in the following.

As is clear from comparing equations (3) and (6),
It is possible to obtain the same average torque at startup as with 3-phase full-wave drive, and it is also possible to save starting current compared to when 3-phase half-wave drive is performed by adding an extra power switching element. .

By the way, assuming that the resistance value per phase of each stator winding is the same in either drive method, the starting current in three-phase half-wave drive is twice that in three-phase full-wave drive, but this will be explained here. With this drive shaft method, the starting current increases by only about 33 percent.

The drive signal generation circuit 300 shown in FIG.

FIG. 11 is a circuit wiring diagram showing a specific example of the configuration of the drive signal generation circuit 300, and the input terminal E is a terminal to which an error voltage is supplied from the outside, and is the same as the E terminal in FIG. It is.

Input terminal f3. g2. h2 are the output terminals f2.h2 of the slope generation circuit 500 shown in FIG. gl, h1, and are supplied with the signal waveforms shown in FIG. 9 d), e), f), and input terminals n3. s3. Position detection signals shown in FIG. 9 a), b), and c) are supplied to z3, respectively.

An overview of the operation will be explained based on the signal waveform diagram in Figure 9.
When the motor starts, the maximum voltage is supplied to the E terminal, and the transistors 301, 302, 303, 304
．． A comparator constituted by constant current transistor 305 operates to turn on transistor 306.

When the transistor 306 is on, the transistors 307, 308, 309, 310, 311, 312
, 313, 314, and 315 is not supplied with power, and therefore, the second current mirror circuit composed of transistors 316, 317 is also cut off, and transistor 31
B, 319, 320, 321. 322, 323, 324
, 325, 326 is also cut off.

On the other hand, since one end of the resistor 327 is connected to the positive feed line 300a by the transistor 306,
Transistors 328, 329, 330, 331, 332
, 333 are all in a power supply standby state, and transition to an on state when a pace current flows.

Assuming that the level of the input terminal n3 is H' and the level of the input terminals S3 and Z3 is 1 L +, the transistors 334, . 335, 336 are turned on, and as a result, the transistors 328, 329 . ．． 33
2 is turned on and the output terminals upl, wnl,
Current supply from vnl becomes possible.

Further, if the level of the input terminal s3 is l Hl and the level of the input terminals 23 and n3 is i L +,
The transistors 337, 338, and 339 are turned on, and the output terminals vpl and wnl are turned on.

Current supply from uni becomes possible, and the input terminal z3
When the level of the input terminal u3. If the level of v3 is L', the transistors 340, 341, 3
42 is in the on state, and the output terminal wpl + uni
, it becomes possible to supply current from vnl.

FIG. 12 is a circuit wiring diagram showing a specific example of the configuration of the drive circuit 700 in FIG. 2, in which input terminals un2 and vn2
, wn2 , up2 +Vρ2. *o2 are the output terminals uni, vnl, wnl, and 1101T of the drive signal generation circuit 300 shown in FIG. 11, respectively.
V+)1, connected to 1vpl.

Therefore, when the level of the initialization signal input terminal j2 connected to the J terminal in FIG.
When current is supplied from the ID2 terminal, Vn2 terminal, and wn2 terminal, the transistors 701, 702, and 703 become conductive, and the output terminal U becomes conductive.

■, Stator winding 1 connected to W in a star shape as shown in Figure 2,
2.degree.3 is connected, current is supplied from the U terminal to the V terminal and W terminal.

Similarly, when current is supplied from the vp2 terminal, wn2 terminal + un2 terminal, the transistor 704.7
05 and the transistor 703 become conductive, current is supplied from the V terminal to the W terminal and the U terminal, and when current is supplied from the wp2 terminal, un2 terminal, and vn2 terminal, the transistor 706 and the transistor 702 , 705 are brought into conduction, and current is supplied from the W terminal to the U and V terminals. In this way, the motor starts rotating, as is clear from the output torque characteristics shown in Figure 10 b), but when the rotational speed of the motor increases to a certain extent and the potential of the E terminal in Figure 11 decreases. The transistor 306 turns off, and the collector current of the transistor 345, which constitutes a differential amplifier circuit together with the transistor 343 and the constant current transistor 344, starts to flow between the collector and emitter of the transistor 308, and the transistors 309 to 309 3
15 are activated, and current is also supplied to the transistor 316 constituting the second current mirror circuit via the transistor 309. Note that the output currents of the transistors 309 to 315 vary depending on the potential of the error voltage supplied to the E terminal.

By the way, D flip-flop (delayed flip-flop) 346, 347. 348, 349, 350, 3
51. AND-OR gate (AND means the logical product of positive logics, and OR means the logical sum of positive logics) 352,
The waveform processing circuit configured by 353 and 354 has the position detection signals shown in m), b), and c) in Fig.
The rotation detection signal shown in FIG. 9(m) is supplied, and furthermore, the signal shown in FIG.

Therefore, the D flip-flops 346, 348.3
The signal waveforms shown in g), h) and i) of FIG. 9 appear at the output terminal of the D flip-flop 3.
The output terminal of 47,349.351 is shown in Figure 9j), k
), the signal waveform shown in l) appears.

During the period when the output of the D flip-flop 346 is at the "H level", the transistor 356 is in an off state, and the D flip-flop 346 is in an off state.
While the output of the flip-flop 347 is at the "H" level, the transistor 357 is in an off state.

Similarly, the D flip-flops 348, 349, 35
During the period when the output of 0°351 is at the 781 level, transistors 358, 359, 360, and 361 are turned off.

On the other hand, the slope current generating transistor 362 is supplied with a signal waveform shown in FIG. Further, since the collector current of the transistor 362 is configured to flow into the transistor 317, the collector current of the transistor 362 has a peak value depending on the collector current of the transistor 345 constituting the differential amplifier circuit, and its slope is the ninth Diagram e
) becomes a sawtooth wave equal to the slope of the signal waveform.

The collector current of the transistor 362 is supplied to a third current mirror circuit constituted by the transistors 318 to 326, and the collector current of the transistor 320
The same current flows through transistor 365.366.36
7.368, 369.370, 371, 372 is supplied to the fourth current mirror circuit.

Note that by setting the output current of the constant current transistor 364 and the resistance value of the resistor 363 to appropriate values, or by adjusting the resistance value of the emitter side resistor of each current mirror circuit, the first current mirror Maximum output current of transistors 310 to 315 forming the circuit and transistors 321 to 32 forming the third current mirror circuit
The maximum output currents of transistors 367 to 372 constituting the fourth current mirror circuit can be made equal, and the magnitude of these maximum output currents is determined by the error supplied to the E terminal. Depends on voltage.

Now, when the output of the D flip-flop 350 and the output of the D flip-flop 351 are both at the "H" level, that is, in the section P1 of FIG. is turned off, and a sawtooth wave current is supplied to the output terminal wnl via the transistor 322.

Subsequently, the output level of the D flip-flop 346 becomes H.
', the transistor 356 is turned off, and current is now supplied to the output terminal via the transistor 311, but both the output of the D flip-flop 346 and the output of the D flip-flop 347 are ''. When the level becomes H level, that is, in section P2 in FIG. 9, the output of the AND gate 375 becomes "H level", so the transistor 376 is turned on and a sawtooth wave current flows through the collector of the transistor 368.

Therefore, the current supplied to the output terminal wn1 gradually decreases, and eventually the current waveform supplied to the output terminal wn1 becomes as shown in FIG. 9m).

Regarding the current waveforms supplied to other output terminals, the AN
D gates 373, 375 and other AND gates 377.3
A similar operation is performed by 78°379.380, so that the output terminals uni, vnl, v
The current waveforms supplied to pl, wpl, and upl are as shown in FIG. 9 n), o'L p), g), and r).

Note that the waveforms indicated by broken lines in FIGS. 9m) to 9r) are current waveforms when the rotational speed of the motor increases and the potential of the E terminal decreases.

The six types of current signals generated in the drive signal generation circuit of FIG. 11 in this way are supplied to the drive circuit of FIG.
The stator windings 1.2.3 are energized via 6.

By the way, assuming that the transistor 701 in FIG. 12 is made as a collection of many small signal transistors on an IC board, and the transistor 707 is assigned to one of them, the transistor 701 and the transistor 707 form a current mirror circuit. The collector current of the transistor 707 is one-half of the collector current of the transistor 701.

When the resistance value of the resistor 708 is zero, the value of K is equal to the emitter area ratio of the transistor 701 and the transistor 707. However, as the resistance value of the resistor 708 increases, the value of K also increases. The value is influenced by the collector current of the transistor 707.

That is, the emitter junction area of the transistor 701 is Sx, the emitter current Ix, the emitter junction area of the transistor 707 is Sy, the emitter current is Iy, the resistance value of the resistor 708 is Re, the electron charge is q, and the Boltzmann constant is When the absolute temperature of the junction is T,
The following relational expression holds true.

The collector current of the transistor 701 is limited so that the voltage across the resistor 709 is ultimately equal to the voltage across the input resistor 710.

Therefore, the input current is 14. The transistor 701
The collector current of is 12+the resistance value of the resistor 710 is R+
+ When the resistance value of the resistor 709 is R27, current amplification in this part II R2 In the above explanation, the current amplification factor of the power supply block whose output section is the transistor 701 is almost constant (in other words, the current amplification factor of each transistor is However, since the other five power supply blocks are constructed based on the same operating principle, they operate in the same manner.

Now, since the level of the initialization signal input terminal j2 in FIG. 12 is L' when the motor is stopped or just before starting,
Transistor 711 is on, transistor 7
12,713,714,715,716,717 and the transistor 71
The current mirror circuits constituted by 8,719,720°721,722 are all in a cutoff state, and no base current is supplied to transistors 701,702,703,704,705.

However, only transistor 706 has transistor 7.
Since the base current is supplied through 23, the transistor 706 is turned on.

However, since all of the transistors 702, 703, and 705 are in the off state, the stator winding 1 in FIG.
, 2.degree. 3, no current that generates rotational force flows through them, and the current necessary for detecting the stationary position of the rotor is supplied to the Hall IC 6 via the current limiting resistor 8.

When the motor is started, the level of the initialization signal input terminal j2 shifts to 2, so the transistor 723 is turned off, but immediately the stator windings 1 to 3 are energized based on the position detection information when the motor is stopped. energization is carried out in the form of
The Hall IC 6 continues to be supplied with the current necessary for detecting the rotational position.

Note that even if the power supply to the Hall IC 6 is temporarily cut off when the motor is started due to the influence of the inductance of the stator windings 1 to 3, the position detection signal is processed by a logic circuit using flip-flops (for example, as shown in Fig. 6). Since the signal is supplied to the drive signal generation circuit via the circuit shown in FIG. 1, the previous information is retained.

Next, FIG. 13 is a circuit connection diagram showing a specific configuration example of the extraction circuit 600 of FIG. 2, in which input terminals n4. s4
are connected to the signal lines 100n and 100s shown in FIG. 2, respectively, and the position detection signals shown in FIG. 14a> and b) are supplied.

The signal supplied to the input terminal s4 is the NAND gate 6
01 and the first flip-flop with NAND gate 602, NAND gate 603 and NAND gate 604.
The signal supplied to the input terminal n4 is used as a reset signal for the second flip-flop formed by the NAND gate 605 and the third flip-flop formed by the NANp gate 606, and the signal supplied to the input terminal n4 is the output of the first to 'ls3 flip-flops. It is used as an update signal.

Therefore, in the configuration of FIG. 13, an output signal appears at the output terminal B when the n4 terminal Q level changes three times while the level of the input terminal s4 is "L".

Figure 14 c), d), and e) are respectively N in Figure 13.
This shows the output signal waveforms of the AND gates 601, 603, and 605. In this way, an absolute position detection signal is obtained from the output terminal B once per rotation of the rotor.

Now, returning to FIG. 2, the outline of the operations explained so far can be summarized as follows.

First, when the rotor is stopped, the U terminal,
■Of the terminals and the W terminal, only the W terminal is at a high potential, and the Hall IC 6 is passed through the stator winding 3 and the current limiting resistor 8.
A current is supplied to detect the resting position of the rotor, and the Hall IC 6 generates an output of a high potential, an intermediate potential, or a low potential depending on the resting position.

In addition, in this embodiment, in order to minimize the number of connecting wires between the motor block IO and other circuit blocks, power is supplied to the Hall IC 6 from the midpoint of the three-phase stator winding, and the output is converted into three values. Although the signal is sent out as a signal, even if the Hall IC is supplied with power from a separately provided power supply terminal and the number of output terminals is increased to two or three, this does not deviate from the purpose of the present invention. .

Depending on the output level of the Hall IC 6, one of the signal lines 100n, 100s, and 100z is activated by the distributor 100, and this position detection information is supplied to the drive signal generation circuit 300 via the sequential circuit 200. However, until the rotor starts rotating, the sequential circuit 2
00 acts as a simple buffer.

Based on the position detection information supplied to the drive signal generation circuit 300, the drive signal generation circuit 300 and the drive circuit 70
0 sets any one of the U terminal, ■ terminal, and W terminal to the 2 level, and sets the rest to the "L level" to generate rotational torque in the rotor.

It should be noted that, at this time, the Hall IC 6 may have stopped by chance at a position where the electrical angle of rotation is 60° in Figure 1θ, that is, at the boundary between the N and S poles of the identification band 5, or at a position where the electrical angle of rotation is 390°. Then, in either case, the Hall IC 6 generates the same output as when facing the non-magnetized portion of the identification band 5, and the stator windings 1 to 3 are energized based on that information. As can be seen from the characteristic curve in Figure 10 b), the rotor will generate rotational torque in the opposite direction.

However, regular position detection information is obtained by moving the rotor by a very small amount, and thereafter, the order in which position detection signals are received is regulated by the sequential circuit 200, so that smooth rotation can be maintained.

When the rotational speed of the rotor increases to a certain level, the potential at the E terminal in FIG. The rotary torque characteristics of the child are as shown in the envelope of the characteristic curve shown in Figure 1C).

Furthermore, in the embodiment, the sawtooth wave generated by the slope generation circuit 500 is used to gently switch the energization to the stator windings 1 to 3.
It can also prevent the stator windings and stator frame from acting like a speaker due to sudden energization switching, which can cause noise during rotation, and also prevent electrical noise from being generated by spike pulses in the stator windings. It is also possible to prevent the IC from being destroyed by surge voltage.

As described above, the slope generating circuit 500 is extremely useful when this type of DC non-commutator motor is used in electronic equipment, but even if it is deleted to simplify the system, it will deviate from the purpose of the present invention. It's not a thing.

By the way, as already explained, the drive signal generation circuit 300 shown in FIG. 11 has the first and second drive modes, and these drive modes are determined by the level of the potential of the signal supplied to the E terminal. In the first drive mode, the current in the stator windings of one phase is always the sum of the currents in the stator windings of the remaining phases in three energization modes depending on the output of the Hall IC 6. Bidirectional energization is performed by the drive circuit 700 as shown in FIG. In the second drive mode, there are six energization modes that are switched every time a predetermined edge (zero cross point) of the output signal from the power generation winding 7 arrives. Although the drive circuit 700 is operated so as to always energize only two phases, the 15th phase
Even if the three-phase stator windings 1, 2, and 3 are connected in a triangular manner as shown in the figure, there is no need to change the circuit configuration of the drive signal generation circuit 300.80 In other words, if the stator windings are connected in a triangular manner, In this case, the drive signal generation circuit 30 is configured to always energize only two phases in the three energization modes of the first drive mode.
0 and the drive circuit 700 operate, and in the six energization modes of the second drive mode, the drive signal generation circuit 300 and the drive circuit 700 operate so that the current of one phase is always the sum of the currents of the remaining phases. Drive circuit 700 operates.

In the configuration shown in FIG. 15, power is supplied to the Hall IC 6 from the U terminal, the ■ terminal, and the W terminal via resistors 91, 92, and 93.

Effects of the Invention Now, as is clear from the above description, the DC non-commutator motor of the present invention has three-phase stator windings 1 to 3 and a permanent motor having a plurality of magnetic poles facing the stator windings. A rotor equipped with a magnet 4, a position detection element that detects the rotational position of the rotor (in the embodiment, a Hall IC 6 is used as the position detection element, but in addition, a general Hall power generation element, a light receiving element, A magneto-electric conversion element may also be used.), an annular identification band 5 having a plurality of components that cause the position detection element to produce output states of different levels depending on the rotational position of the rotor, and a stator. a power generating body disposed at a position facing the rotor above and having power generating elements having an integral multiple of the number of magnetic poles of the permanent magnet (in the embodiment, a power generating body having power generating elements having three times the number of magnetic poles of the permanent magnet; Although the winding 7 is used, even if it has two or three times as many power generation elements, the power generation output signal can be divided and used, and the power generation body is limited to the power generation winding. Alternatively, by using a light emitting element and a shutter disk together, a light receiving element such as a phototransistor can be used as a power generating body.

), a driving means for supplying current to the stator winding (in the embodiment, the driving means is constituted by a driving circuit 700), and has first and second driving modes, and has a driving means for supplying current to the stator winding. While switching the drive mode, in the first drive mode, the drive means is operated in three energization modes depending on the output of the position detection element to bidirectionally energize the stator winding, and Second
In the drive mode, the predetermined edge of the output signal from the power generator (in the embodiment, the number of power generating elements of the power generating winding 7 is three times the number of magnetic poles of the permanent magnet 4, so the predetermined edge indicates each zero-crossing point of the output signal. For example, if the number of power generating elements is set to six times the number of magnetic poles, the predetermined edge will indicate every other zero-crossing point.

) is characterized in that it is equipped with a drive signal generation circuit that operates the drive means in G ways of energization mode that switches each time G types of energization modes arrive, and causes the stator winding to be energized in both directions. By bidirectionally energizing the stator windings in the normal energization mode, it is possible to start with a rotational torque comparable to that of three-phase full-wave drive, and after the rotor d rotational speed increases to a certain extent, the power generation body Based on the rotation information, it is possible to operate with three-phase full-wave drive with less torque ripple, which has great effects.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a motor section configured to carry out the present invention, Fig. 2 is a block diagram of a DC non-commutator motor according to an embodiment of the present invention, and Fig. 3 is an internal circuit of a Hall IC. A wiring diagram, Fig. 4 is a signal waveform diagram corresponding to the magnetization pattern of the identification band to explain the processing operation of the position detection signal, Fig. 5 is a flowchart when realizing a sequential circuit with software, and Fig. 6 7 is a circuit connection diagram showing an example of the configuration of a sequential circuit, FIG. 8 is a circuit connection diagram showing an example of the configuration of a slope generation circuit, and FIG. 9 is a signal waveform diagram for explaining the processing operation of a position detection signal. , FIG. 10 is a torque characteristic diagram for explaining the torque characteristics of the motor and energization switching,
FIG. 11 is a circuit connection diagram showing a specific example of the drive signal generation circuit, FIG. 12 is a circuit connection diagram showing a specific example of the drive circuit, and FIG.
Figure 3 is a circuit connection diagram showing an example of the configuration of the extraction circuit, Figure 14 is a signal waveform diagram of each part of the circuit in Figure 13, and Figure 15 is a circuit connection diagram showing another method of connecting the stator windings. . 1.2.3... Stator winding, 4... Curved permanent magnet, 5... Song identification band. 6...Hall IC,?・・・・・・Generating winding,
300... Drive signal generation circuit, 700...
...Drive circuit. Name of agent: Patent attorney Toshio Nakao (1st person)
Fig. υ Fig. 2 Fig. 5 Fig. 6 Fig. 8 Fig. 9 iJ "-'-1"'-〇 Fig. 10 l

Claims (3)

[Claims] (1) A rotor including a three-phase stator winding, a permanent magnet having a plurality of magnetic poles facing the stator winding, a position detection element that detects the rotational position of the rotor, and a rotor that detects the rotational position of the rotor. an annular identification band having a plurality of components that cause the position detection element to generate output states of different levels depending on the rotational position of the child; A power generating body having power generation elements having an integral multiple of the number of magnetic poles of a permanent magnet, a drive means for supplying current to the stator winding, and a first and second drive mode, wherein the drive mode is set by an external input signal. At the same time, in the first drive mode, the drive means is operated in three energization modes according to the output of the position detection element, so that the stator winding is bidirectionally energized, and the second drive mode is switched. In the drive mode, the drive signal generating circuit operates the drive means in six energization modes that are switched each time a predetermined edge of the output signal from the power generator arrives, thereby bidirectionally energizing the stator windings. A DC commutatorless motor. (2) The stator windings of the 1st, 2nd, and 3rd phases are connected in a star pattern, and in the three energization modes of the first drive mode, the current in one phase is always the current in the remaining phases. and a drive signal generation circuit that operates the drive means so that the sum of A DC commutatorless motor according to claim 1, comprising: (3) The stator windings of the first phase, second phase, and third phase are connected triangularly, and in the three energization modes of the first drive mode,
The drive means is operated so as to always energize only two phases, and in the six energization modes of the second drive mode,
2. A DC non-commutator motor according to claim 1, further comprising a drive signal generating circuit for operating said drive means so that the current of one phase always becomes the sum of the currents of the remaining phases.