JPH05184118A - Motor - Google Patents

Abstract

PURPOSE:To provide a motor with a self-control function in a compact structure. CONSTITUTION:In an inverter control motor, detecting sensors 41, 42, and 43 are provided at a stator 1 for detecting rotational signals, such as rotational position, rotational angles, rotational direction, torque, and temperatures at a rotor 2 so that the inverter control motor has a signal self-detecting function. A microprocessor is provided in a motor box for processing the data from the detecting sensors 41 to 43 in comparison with an informational instruction, and generating an inverter control signal.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to rotary motors.

[0002]

2. Description of the Related Art Conventionally, there is known an inverter motor in which a stator coil is excited by an inverter control to form a rotating magnetic field, and the rotor is rotated by being pulled by the rotating magnetic field. According to this inverter control, the rotation speed can be arbitrarily controlled by the switching speed, and the rotation direction can be switched by switching the order of the switching control. However, in the conventional motor, in order to perform the speed control as described above, a tacho-generator is provided on the rotating shaft of the rotor to control by feeding back the electromotive force of the generator, and an encoder is provided to the rotor for position control. It is customary to detect the angle and feed back the detection signal to the inverter for control.

[0003]

SUMMARY OF THE INVENTION According to the present invention, the motor itself has a control function without combining a detector outside the motor to control the motor as in the prior art, and the various functions are combined. An object is to provide a motor that is compact and has a whole body. The purpose of the present invention is to provide a multifunctional motor that can be arbitrarily applied to any target.

[0004]

In a motor in which a magnetic field is controlled by an inverter, a stator is provided with a detection signal of a rotation signal such as a rotation position, a rotation angle, a rotation direction, a rotation speed, a torque, and a temperature of a rotor. It is characterized in that a microprocessor for comparing and processing the detection data of the detection sensor with the command information and outputting the inverter control signal is attached to the motor casing. Further, by selecting the detection data from the plurality of detection sensors of the rotation signal,
The microprocessor is provided with an input unit of a multiplexer for supplying to the microprocessor.

[0005]

As described above, according to the present invention, the stator of the inverter control motor is provided with a detection sensor for detecting rotational signals such as rotational position, rotational angle, rotational direction, rotational speed, torque, temperature, etc. Since the function is provided, it is possible to detect signals with extremely high sensitivity without the need to mount a detector as in the conventional case, and by providing a plurality of detection sensors, various kinds of signals can be detected simultaneously. Since the microprocessor that mounts the inverter control signal by comparing the detection data of the detection sensor with the command information and outputs the inverter control signal is installed in the motor housing, it can be installed without connecting a long cable lead to the control circuit device. It is possible to perform stable signal arithmetic processing and control by it without worrying about noise or the like. Then, the motor having this high function can be constructed extremely compactly without providing an external controller.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment of the drawings. FIG. 1 is a side sectional view of the motor, showing magnetic poles AA, BB and C.
C are arranged at an angle of 60 ° and coil LA is arranged on each.
A, LBB, and LCC are wound. A rotor 2 is inserted in the stator, and is rotatably supported by the rotating shaft 3. As the rotor 2, a cylindrical permanent magnet or a laminate of silicon steel plates is used. 41, 42,
Reference numeral 43 is a magnetic sensor such as a magnetoresistive element and a Hall effect element, and 41 and 42 are arranged at the positions of the magnetic poles C and A, respectively, and 43 is arranged between the magnetic poles A and B, whereby the position of the rotor 2 can be detected. To do.

FIG. 2 shows a circuit diagram of a motor-driven inverter and a microprocessor for controlling the rotation thereof. The inverter exchanges three-phase alternating current with a rectifier 5,
This DC power source is switching-controlled by three MOSFETs 61, 62 and 63 to control the stator coils LAA and LB.
Energize B and LCC. Reference numeral 7 is a drive circuit for switching controlling each FET. To detect the position of the rotor 2, the salient poles 21, 22, 23, and 24 of the rotor 2 detect the magnetic sensors 41,
Detected by the number of pulses passing through 42, 43, and
The rotation direction can be detected by the detection order of the three sensors 41, 42, 43, and the rotation speed can be detected by the number of detection pulses per unit time. Detection data is A / D converter 8
Input to the CPU 9 through. An input device 10 for command information is stored in the memory 12 through the A / D converter 11. Reference numeral 13 is an interface I / O for operation output.

In the above, the memory 12 stores the operation command in addition to the command information, and the control signals for the operation device in the CPU 9 and the memory 12 are given from the instruction register of the control circuit in the CPU 9. The instruction word given to is stored in the memory 12, and while being sequentially transferred to the instruction register, the control signal is transmitted to each part of the arithmetic unit and a predetermined arithmetic operation is executed. The order time relation of these arithmetic control is adjusted and controlled by the clock.
Also, command information from the command input 10, such as position, direction,
Information such as speed is also stored in the memory 12 in accordance with the address, and the content of the address register is sent to the address path and addressed to control data extraction.

The detection data from the sensors 41, 42 and 43 is input through the A / D converter 8 and temporarily stored in the register. The data designated by the addresses are sequentially stored in the order of addresses, and the stored data are read out and processed according to the addresses. The operation of the arithmetic unit of the CPU 9 sets one address in the program counter, and the arithmetic operation is executed according to the contents fetched from the memory 12 to the instruction register. It reads the detection data stored in the register according to the address, Computation processing for obtaining the difference by comparison with the command information from the memory 12 of FIG. The calculation result outputs a signal having an operation amount corresponding to it, and the drive circuit 7 controls the switches 61, 62, 63 of the inverter. Magnetic field coils LAA, LBB, LCC by switching control
Are sequentially excited by a phase difference to form a rotating magnetic field to control the rotation of the rotor 2, and the rotation speed of the rotor 2 can be controlled by controlling the switching speed. This rotation speed can be controlled so as to match the information input by the command device 10.

Next, the position can be controlled by the data from the detection sensors 41, 42 and 43. A comparison calculation process is performed between the data stored in the register of the CPU 9 and the command information from the memory 12. That is, a signal is output so that the difference between the detected data quantity and the command value becomes 0. To execute this operation, an address is set in the program counter and each time the counter is incremented by one, The CPU senses this and executes the read operation. Thus, when the execution of one instruction is completed, the content of the program counter is also incremented by one, the content of the next address is taken out as an instruction word, and the arithmetic processing corresponding to it is executed. The operation output of the CPU 9 thus processed is temporarily stored in a register and output as a control signal.
It is supplied to the drive circuit 7 through the I / O 13. The drive circuit 7 switches the switches 61 and 6 at a speed corresponding to the input signal.
Phase control of 2, 63, coils LAA, LBB, LCC
Is excited to control the formation of a rotating magnetic field, rotate the rotor twice, and stop when the switches 61, 62, 63 are stopped when the rotor rotates to the command position.

An induction motor in which silicon steel sheets are stacked is used for the rotor 2 instead of the permanent magnet. In FIG. 3, three coils L are used.
The induction type in which AA, LBB, and LCC are wound around six magnetic poles AA, BB, and CC is shown. Now, when the switch 63 of the inverter circuit is turned on, the current flows from LCC to LAA + LBB, and the direction of the flowing magnetic field is in the vertical direction in the figure. Then switch 62
When and 63 are turned on, the current flows to LBB + LCC → LAA and the magnetic field flows to 45 °. When the switch 62 is turned on, a current flows through LBB → LCC + LAA and the magnetic field is 130
Suitable for ゜. When the switches 61 and 62 are turned on, the magnetic field is directed from the bottom to the top, when the switch 61 is turned on, the magnetic field is directed to 225 °, and when the switches 61 and 63 are turned on, the magnetic field is directed to 315 °. In this way, the magnetic field rotates in the clockwise direction, an induced current flows through the cage rotor 2 in the rotating magnetic field, and the cage rotor 2 is rotated by the electromagnetic force. Also, when switching is performed in the reverse order to the above, rotation occurs counterclockwise. These switching controls are controlled by the operation of the drive circuit 7 by the signal of the microprocessor.

When a stator and a rotor are made of a silicon steel plate, it is difficult to use an alloy having a silicon content of 6.5% with a small magnetic anisotropy and a magnetostriction because workability is difficult. Although it was not possible to make an accurate one, in the present invention NC
High precision can be easily obtained by using the wire cut electric discharge machining method. For example, in the processing of a silicon steel plate having a thickness of 0.1 mm, the accuracy is ± 0.03 in press working.
Although it was about mm, it was ± 0.01 according to the wire cut.
It can be easily processed to about mm.

FIG. 4 shows another embodiment of the microprocessor. Each signal 14 from a plurality of detection sensors for detecting the rotation position, rotation angle, rotation direction, rotation speed, torque, temperature and other signals of the rotation signal. , 15, 16 ... Are provided with an input unit for inputting the signals to the microprocessor through the multiplexer 17. The multiplexer 17 selects a plurality of signals from the sensor and inputs them to the CPU 9. The signals are first converted to a voltage level suitable for the multiplexer 17, and only the signal designated by the A / D conversion control unit 18 is selected. It is quantized into a digital amount by the A / D converter and input to the CPU 9. The arithmetic processing of the CPU 9 is similar to the above, and even if there are a plurality of input data, the arithmetic processing can be executed by sequentially selecting and inputting them.

[0014]

As described above, according to the present invention, the rotation position, rotation angle, rotation direction of the rotor of the inverter control motor,
Since the stator is equipped with a sensor for detecting rotation signals such as rotation speed, torque, and temperature, and the motor itself has the function of signal detection, extremely high-precision signal detection can be achieved without the need to install a detector as in the past. It is possible to detect various signals at the same time by providing a plurality of detection sensors. Since the microprocessor that mounts the inverter control signal by comparing the detection data of the detection sensor with the command information and outputs the inverter control signal is installed in the motor housing, it can be installed without connecting a long cable lead to the control circuit device. It is possible to perform stable signal arithmetic processing and control by it without worrying about noise or the like. The motor having this high function can be made extremely compact without providing an external controller.

Further, as described above, the motor can be arbitrarily controlled for position control, angle control, forward / reverse rotation control, speed control, torque control, etc. Therefore, accurate positioning control of the table or the like of the mechanical device can be performed. Suitable as a drive motor for air, oil, and water pumps with controlled flow rate,
Also, stable speed control can be performed as a drive motor for laser disks, tapes, watches and the like. Also, as a cutting, grinding, and whetstone drive motor, speed control can be done easily.
It is also suitable as a servo control motor for machine tools or robots, and can be provided as a multi-function motor that can be easily applied to any target.

[Brief description of drawings]

FIG. 1 is a structural diagram of an embodiment of a motor of the present invention.

FIG. 2 is a circuit diagram of an inverter drive circuit and a control microprocessor.

FIG. 3 is a coil circuit diagram of another embodiment of the motor.

FIG. 4 is another circuit diagram of the control microprocessor.

[Explanation of symbols]

1 Stator, AA, BB, CC magnetic pole, LAA, L
BB, LCC coil 2 rotor 3 rotary shaft 41, 42, 43 magnetic sensor 5 power supply rectifier 61, 62, 63 switch 7 drive circuit 8, 11 A / D converter 9 CPU 12 memory 13 interface 17 multiplexer

Claims (2)

[Claims] 1. In a motor in which a magnetic field is controlled by an inverter, a rotor rotation position, rotation angle,
A detection sensor for a rotation signal such as a rotation direction, a rotation speed, a torque, and a temperature is provided, and a microprocessor for performing a comparison calculation processing of detection data of the detection sensor with command information and outputting the inverter control signal is attached to a motor housing. A motor characterized by that. 2. The microprocessor is provided with an input section of a multiplexer for selecting detection data from a plurality of detection sensors of the rotation signal and supplying it to the microprocessor. The motor according to item.