JPH0543798U - Motor drive controller - Google Patents

Abstract

(57) [Summary] [Structure] The phase corrector 12 determines the phase of the output (U _HO , U _LO ) of the phase detector 4 based on the outputs (V _H , V _L ) of the rotor position detector 2. Of the output (U _H , U
_L ) is generated and output to the motor driver 11. The motor driver 11 outputs the outputs h, i from the rotor position detector 2.
And the outputs U _H and U _L from the phase corrector 12 control switching switching at a predetermined timing. [Effect] The configuration can be simplified, and the size and cost can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a motor drive control device, and more particularly to a motor drive control device that corrects a phase shift between a rotor and a stator and turns on and off a motor drive power supply at a constant cycle to drive and control a motor.

[0002]

[Prior Art]

 Conventionally, in a drive controller for a brushless motor, for example, a three-phase brushless motor, a rotor position detector such as a Hall element is arranged around the rotor at 120 ° intervals, and each armature coil (hereinafter , A coil) is applied with a drive voltage to rotate the rotor.

FIG. 5 is a block diagram showing an example of a conventional motor drive control device. In this case, a three-phase brushless motor is used as the motor. In the figure, 1 is a three-phase brushless motor (hereinafter simply referred to as a motor) and a rotary drum, and 2 is a rotor position detector for detecting the position of a rotor (rotary drum). The rotor position detector 2 is composed of three rotor position detectors 2a to 2c as shown in FIG. 6, and sends three pulse outputs h, i, j to the motor driver 11. The motor driver 11 uses the output from the rotor position detector 2 to keep the switching phases of the coils U, V, W of the motor and the phase of the rotating drum constant at predetermined timings for the coils U, V, W of the motor. The drive voltage is output by and the torque is efficiently transmitted to the rotor.

Further, in order to stabilize the rotation speed, one or two (here, one) phase detector 4 and frequency detector 3 are provided. The frequency detector 3 detects the frequency of the rotating drum and outputs a frequency detection signal (FG). The frequency detector 3 sends the output (FG) to the frequency servo phase comparator 5. To do. Here, the frequency detector 3 sends several 100 pulses per one rotation of the rotary drum as an output (FG). The phase detector 4 detects the phase of the motor and outputs a phase detection signal (PG). The phase detector 4 sends the output (PG) to the phase servo phase comparator 6. .. Here, the phase detector 4 sends, as an output (PG), about 1 or 2 pulses per one rotation of the rotating drum.

The frequency servo phase comparator 5 compares the frequency detection signal (FG) from the frequency detector 3 with the reference signal from the reference signal generator 7 in phase, and outputs the comparison output as a frequency servo loop filter. 8 to the summing amplifier 10. The phase servo phase comparator 6 compares the output (PG) from the phase comparator 4 with the reference signal from the reference signal generator 7 in phase, and the comparison output is added via the phase servo loop filter 9 to the addition amplifier 10 Supply to. Summing amplifier 10 adds the outputs of the phase servo loop filter 9 in the frequency servo loop filter 8 is supplied to Motadora driver 11 as a control error voltage, controls the power supply voltage V _M shown in FIG. 6 of the motor driver 11 The output voltage (or output current) of the motor driver 11 is controlled to control the phase and rotation speed of the motor.

Next, FIG. 6 shows a configuration in the vicinity of the three-phase motor shown in FIG. In FIG. 6, three coils U, V, W are arranged at 120 ° intervals on the stator side of the motor, and one ends of the coils U, V, W are commonly connected as shown. The other ends of the coils U, V, and W are connected to the connection point between the emitter of the transistor T3 and the emitter of the transistor T4, the connection point between the emitter of the transistor T1 and the emitter of the transistor T2, and the emitter of the transistor T5 and the transistor, respectively. It is connected to the connection point with the emitter of T6. The collectors of the transistors T1, T3 and T5 are connected to the power supply voltage V _M. The collectors of the transistors T2, T4 and T6 are grounded.

The motor driver 11 is composed of transistors T1 to T6 and a power source V _M. The motor driver 11 is supplied with the outputs h, i, j of the rotor position detectors 2a to 2c arranged at 120 ° intervals to detect the position of the rotating drum of the motor. Hall elements, magnetoresistive elements, etc. are often used as the rotor position detectors 2a to 2c, but here Hall elements are used. As outputs h of the rotor position detector 2a, the voltages V _H and V _L shown in FIG. 7 are supplied to the base input terminals of the transistors T 1 and T2, respectively. The voltage W _H shown in FIG. 7 as an output i of the rotor position detector 2b, W _L is supplied to the base input terminal of the transistor T5, T6 respectively. Further, the voltage U _H shown in FIG. 7 as the output j of the rotor position detector 2c, U _L is supplied to the base input terminal of the transistor T3, T4, respectively. Voltage V _H as shown in FIG. 7 to the base input terminal of the transistor _{T1~T6, V L, U H,} U L, W H, by W _L is supplied at the timing shown in the figure, coils U, V, The drive voltage signals U, V, W as shown in FIG. 7 are supplied to W. Further, the phase detector 4 is provided on the side facing the rotor position detector 2a.

Next, the operation will be described with reference to FIG. FIG. 7 is a timing chart showing the voltage waveform of each part in FIG. Now, at t = t ₁ , the transistors T3 and T2 are turned on by the voltages U _H and V _L shown in FIG. Therefore, the current flows from the power source V _M to the ground through the path of the transistor T3 → the coil U → the coil V → the transistor T2. At this time, a magnetic field is generated by the current flowing through the two coils U and V, a force of attraction and repulsion is generated with the permanent magnet on the rotor 1a side, and a torque for rotating the rotor 1a side is generated.

Next, t = t₁ Then, the voltage U shown in FIG._H , V_L As a result, the transistor T3 remains on and the transistor T2 turns off. Instead, the voltage W shown in FIG._L This turns on the transistor T6. At this time, the current is the power supply V_M Then, the current flows through the path of the transistor T3 → coil U → coil W → transistor T6 to the ground. Therefore, the rotational torque is obtained from the magnetic fluxes of the coil U and the coil W. As described above, the transistors T1 to T6 are connected to the base input voltage U shown in FIG._H , U_L , V_H , V _L , W_H , W_L In accordance with the above, the phases are turned on by 120 ° in a predetermined order, and the rotation is sequentially switched to obtain stable rotation.

[0010]

[Problems to be solved by the device]

In the above-described conventional motor drive control device, three output signals h, i, j from the three rotor position detectors 2a to 2c are necessary to detect the rotor (rotary drum) of the motor. .. The output signal h, i, as j, respectively _{V H, V L; U H} , U L; W H, but generates the W _L, the output signal _{V H, V L; U H} , U L; W _H, W _L is obtained in the following manner. That is, in each of the rotor position detectors 2a to 2c, the output from the Hall element is compared with two reference values by a comparator, and the output signals _VH , _VL ; _UH , U are output as comparison outputs of the comparator. _L ; W _H and W _L are obtained. As described above, since three output signals h, i, and j from the three rotor position detectors 2a to 2c are required, the configuration is complicated, the size is increased, and the cost is high.

An object of the present invention is to provide a motor drive control device having a simplified structure, a reduced size, and a reduced cost as compared with conventional ones.

[0012]

[Means for Solving the Problems]

 The motor drive control device of the present invention has a phase detection means for detecting the phase of the motor and a plurality of position detection means for detecting the position of the rotor. In a motor drive control device for driving and controlling a motor by turning it on and off, based on the output of one or more of the remaining position detecting means obtained by removing one position detecting means from among the plurality of position detecting means, Phase correction means for correcting the phase shift of the output of the phase detection means is provided, and the timing for turning on and off the motor drive power supply at a constant cycle is obtained based on the outputs of the remaining position detection means and phase correction means. Is characterized by.

[0013]

[Action]

 In the motor drive control device having the above configuration, the phase correction means is one or more of the remaining position detection means obtained by removing one position detection means from the plurality of position detection means for detecting the position of the rotor. The phase shift of the output of the phase detection means for detecting the phase of the motor is corrected on the basis of the output of. The motor drive power supply is turned on and off at a constant cycle based on the outputs of the remaining position detection means and the phase correction means.

Thus, by using the conventional phase detecting means also as the position detecting means, it is possible to omit one position detecting means, which simplifies the configuration, downsizes and costs compared with the conventional case. Reduction can be achieved.

[0015]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a motor drive control device according to the present invention. Here, a case where a three-phase brushless motor is used as the motor is shown. In FIG. 1, the same or corresponding parts as those in FIG. Further, FIG. 2 is a diagram showing a configuration near the three-phase motor of FIG.

In FIG. 1, the relationship between the motor and the rotary drum 1, the rotor position detector 2, the phase detector 4, and the motor driver 11 is specifically configured as shown in FIG. Here, the rotor position detector 2 is composed of two rotor position detectors 2a and 2b as shown in FIG. These rotor position detectors 2a and 2b are arranged at an interval of φ ₁ (= 120 °) as shown in FIG. This φ ₁ corresponds to the phase shift φ ₁ in FIG. Although the rotor position detector 2c is provided in FIG. 5, this is omitted in the present invention, and the omitted rotor position detector 2c is also used as the phase detector 4. As shown in FIG. 3, the phase detector 4 is located at a position facing the rotor position detector 2a and is displaced by φ ₂ (= 60 °) from the position of the conventional rotor position detector 2c. It is provided.

Outputs of the rotor position detector 2, that is, outputs h of the rotor position detectors 2a and 2b (voltage signals V _H and V _{L in} FIG. 4), i (voltage signals W _H and W _{L in} FIG. 4) Are supplied to the motor driver 11. Further, the phase detector 4 supplies a part of the output (voltage signal U _{HO in} FIG. 4) to the phase servo phase comparator 6 and outputs k (voltage signals U _HO , U _{LO in} FIG. 4) phase corrector. 12 to supply. As can be seen from FIG. 4, the phase detector 4 outputs one pulse (voltage signal U _HO ) to the phase servo phase comparator 6 per one rotation of the rotary drum. Further, the phase corrector 12 is supplied with the output h of the rotor position detector 2a (voltage signals _VH and _{VL in} FIG. 4).

The phase corrector 12 is a delay circuit for correcting the phase shift of the output k (U _HO , U _LO ) of the phase detector 4, and the phase corrector 12 is the rotor position detector 2 a. the output h to the original, and corrects the phase shift of the output k of the phase detector 4, the output (No. voltage signal in FIG. 4 U _H, U _L) is adapted to supply to the motor driver 11.

The phase corrector 12 is provided for the following reason. That is, in the position detectors 2a and 2b, since hall elements or magnetoresistive elements (here, hall elements) are used as the position detecting elements, the sinusoidal voltage signal as shown in FIG. 4 is output as the position detecting elements. V _O and W _O are obtained. In the phase detector 4, when a coil is used as the phase detection element, a differential waveform as shown in FIG. 4 is obtained as the output U _O of the phase detection element, so that a phase shift of rising or falling of the waveform occurs. Will end up. Therefore, a phase difference occurs between the output U _O of the phase detection element of the phase detector 4 and the outputs V _O and W _{O of the} position detection elements of the rotor position detectors 2a and 2b. Therefore, it is necessary to correct this phase shift.

The rotor position detector 2a supplies the voltage signals V _H and V _L shown in FIG. 4 as outputs h to the base input terminals of the transistors T1 and T2 that form the motor driver 11 of FIG. 2, respectively. It is supposed to do. The rotor position detector 2b supplies the voltage signals W _H and W _L shown in FIG. 4 as the output i to the base input terminals of the transistors T5 and T6 constituting the motor driver 11 shown in FIG. 2, respectively. ing. Further, the phase corrector 12 supplies the voltage signals U _H and U _L as outputs to the base input terminals of the transistors T1 and T2 constituting the motor driver 11 of FIG. 2, respectively.

Next, the operation will be described with reference to FIG. Note that FIG. 4 is a timing chart for explaining the operation of FIGS. 1 and 2. The rotor position detector 2a that constitutes the rotor position detector 2 has a Hall element as a position detection element and a comparator, and has a sinusoidal voltage signal as shown in FIG. V _O is compared with two reference values (shown by chain lines 21 and 22 in FIG. 4) by a comparator to generate voltage signals V _H and V _L shown in FIG. 4 as an output h of the comparator, and these voltage signals are output. V _H and V _L are supplied to the phase corrector 12 and the motor driver 11 as outputs h of the rotor position detector 2a. The outputs h (V _H , V _L ) of the rotor position detector 2a are supplied to the base input terminals of the transistors T1 and T2 of the motor driver 11.

Similarly, the rotor position detector 2b constituting the rotor position detector 2 also has a hall element as a position detecting element and a comparator, and outputs a sine wave as shown in FIG. 4 from the hall element. The voltage signal W _O having a waveform is compared with two reference values (shown by chain lines 23 and 24 in FIG. 4) by the comparator to generate the voltage signals W _H and W _L shown in FIG. 4 as the output i of the comparator. , And these voltage signals W _H and W _L are supplied to the motor driver 11 as the output i of the rotor position detector 2b. Output i (W _H, W _L) of the rotor position detector 2b is Ru is supplied to the base input terminal of the transistor T5, T6 of the motor driver 11.

The phase comparator 4 has a phase detecting element and a comparator, and the output from the phase detecting element is the voltage signal U of the differential waveform shown in FIG._O Is. The comparator outputs this output U_O Is compared with two reference values (shown by chain lines 25 and 26 in FIG. 4), and the voltage signal U shown in FIG._HO, U_LOTo generate these voltage signals U_HO, U_LOIs output to the phase corrector 12 as the output k of the phase detector 4. As described above, the voltage signal U _O Is a differential waveform, the sinusoidal voltage signal V_O There is a phase shift of Δt compared with. Therefore, it is necessary for the phase corrector 12 to correct the phase shift.

The phase corrector 12 is supplied with the outputs h (V _H , V _L ) of the rotor position detector 2 a and the outputs k (U _HO , U _LO ) of the phase detector 4. The phase corrector 12 corrects the deviation Δt between the phase of the rotor 1a and the switching phase of the coils U to W of the stator, that is, the phase deviation Δt between the voltage signal U _O and the voltage signal V _O. The voltage signals U _H and U _L are generated as follows. That determines the rise of the U _H as shown in FIG. 4 on the rising of the pulse of the U _HO, after launch of U _H, the U _H by determining the fall after △ t delayed by the rise of V _H To generate. Also, U by determining the fall of U _L as shown in FIG. 4 determined by the fall of the pulse of the U _LO, after the fall of the U _L, the rise after △ t delayed by the fall of the V _{L L} To generate. The phase corrector 12 supplies the voltage signals U _H and U _L to the base input terminals of the transistors T3 and T4 of the motor driver 11.

The voltage signal V _H as shown in FIG. 4 to the base input terminal of each transistor T1~T6 the motor driver 11 in FIG. _{2, V L; U H,} U L; W H, by W _L, the transistors data T1 ON to OFF are sequentially switched to T6 at a predetermined timing. In this way, the drive voltages U, V, and W shown in FIG. 4 are applied to the coils U, V, and W at the timings shown in the figure, and the drive of the motor is controlled. As a result, the phase of the rotor 1a matches the phase of the switching timing of the stator coils U to W, torque ripple is not generated, and therefore rotation jitter is not generated, so that rotation torque is efficiently transmitted.

As can be seen from the above description, the motor drive control device of the present invention can drive and control the motor as efficiently as the conventional one, and omits the rotor position detector 2c as compared with the conventional one. Since the existing rotor phase detector 2c is also used as the conventional phase detector 4, the configuration can be simplified, and the size and cost can be reduced.

The present invention is not limited to this embodiment, and various applications and modifications are conceivable without departing from the gist of the present invention. For example, the present invention can be applied to brushless motors other than three-phase motors, or drive type motors other than brushless motors.

[0028]

[Effect of the device]

 As described above, according to the present invention, by using the existing phase detecting means also as the position detecting means, one position detecting means can be omitted, which simplifies the configuration as compared with the conventional one. It is possible to reduce the size and cost.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a motor drive control device according to the present invention.

FIG. 2 is a diagram showing a configuration near a three-phase motor shown in FIG.

3 is a diagram showing a positional relationship between a rotor position detector and a phase detector of FIG.

FIG. 4 is a timing chart for explaining the operation of FIGS. 1 and 2.

FIG. 5 is a block diagram showing an example of a conventional motor drive control device.

FIG. 6 is a diagram showing a configuration near a three-phase motor of FIG.

FIG. 7 is a timing chart showing voltage waveforms of respective parts in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor and rotating drum 1a Rotor 2, 2a, 2b Rotor position detector 4 Phase detector 11 Motor driver 12 Phase corrector

Claims (2)

[Scope of utility model registration request] 1. A motor driving power supply is turned on and off at a constant cycle based on an output of the position detecting means, which has a phase detecting means for detecting a phase of a motor and a plurality of position detecting means for detecting a position of a rotor. In the motor drive control device for controlling the drive of the motor, the phase detection means is based on one or more outputs of the remaining position detection means obtained by removing one position detection means from the plurality of position detection means. Phase correction means for correcting the phase shift of the output of the motor drive power supply is obtained based on the outputs of the remaining position detection means and the phase correction means. A characteristic motor drive control device. 2. The motor drive control device according to claim 1, wherein a brushless motor is used as the motor.