JPH11171415A - Drive power source device for induction motor and linear motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent operation from becoming impossible at driving by relatively low voltage by detecting the load of an induction motor or a linear motor, or the loading load of an elevator driven by them, and changing a drive electric power device according to the detected result. SOLUTION: At service interruption, a motor is driven by batterires 1, 2 of relatively low voltage, but at this time, power is supplied to a converter 19 by the batteries 1, 2 through relay contactors A, B to drive a linear motor 21. Power supply voltage is impressed on respective circuits 24-28 concerning operation control of an elevator by an inverter 32 for battery and a rectifying circuit 23 through a relay contactor C. In this case, in addition to looking for the maximum thrust at operating from the output of a load detecting circuit 28 and the operating direction, slip frequency is looked for, the relays A-C are ON-controlled according to the magnitude of primary voltage decided from the slip frequency, a speed command value, and the like, and the electric power source is switched to either of the battery 1 only or joint use of the batteries 1, 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a linear motor device and a power supply device for a linear motor type elevator.

[0002]

2. Description of the Related Art In general, an induction motor or a linear motor and a system driven by using the motor as a motive power are often controlled by keeping a motor voltage and a slip frequency constant. In this drive device, the maximum value of the primary frequency is limited by the maximum output voltage that can be supplied to the motor, and when the speed of the motor is set to a very low speed or in a motor with a large slip such as a linear induction motor, it is relatively lower than a normal power supply. When the power running operation is performed at the power supply voltage, a sufficient torque is not output, which hinders the operation of the motor driving device.

In particular, a linear motor having a large slip has a relatively low power supply frequency of several Hz to several tens of Hz. When the motor is driven by a battery at the time of a power failure, it is usually used as a power supply shared with other electric circuits. For this reason, 12, 24, and 48 V are often supplied by using an automobile power supply or the like, and the voltage is often lower than that of a normal power supply.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drive power supply control device at the time of low voltage drive in the event of a power failure of an induction motor or a linear motor.

[0005]

In order to achieve the above object, a driving power supply control device according to the present invention comprises means for detecting a load of an induction motor or a linear motor, or a load of an elevator driven by these, and a driving direction. And speed control means, and control means for switching the drive power supply device.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

First, the outline of the structure of the linear motor type elevator shown in FIG. 4 will be described. The cylindrical linear motor includes a cylindrical mover 1 serving as a primary conductor and a cylindrical stator rod 2 serving as a secondary conductor. The cylindrical mover 1 is attached to the inside of the casing frame 3, and the casing frame 3 as a whole constitutes a counterweight 5 for the car 4. The car 4 and the counterweight 5 are connected by four ropes 8 via four pulleys 7 installed on a building support member 6 above the building.

A car guide rail 9 and a counterweight guide rail 10 are vertically provided on both sides of the car 4 and the counterweight 5, respectively.
1, the car 4 and the counterweight 5 move up and down via respective roller guides 16 and 17.

Further, a brake 12 is provided on the lower side of the casing frame 3 to operate when the elevator stops and an emergency stop occurs in the event of an abnormal situation, and a rotary encoder 13 is provided on the upper side for a counterweight. It is installed in contact with the guide rail and is used for detecting the speed and position of the elevator.

A cylindrical rod 2 serving as a secondary conductor of the linear motor penetrates the cylindrical mover 1 and its upper and lower ends have a rod supporting elastic member 14 provided on a supporting member 11 constituting a hoistway, and 15 are provided.

An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows an example of an electric system diagram of a linear motor type elevator. A normal power supply 18 is supplied to a linear motor 21 (corresponding to the mover 1 in FIG. 3) via a power-on contactor D, a converter 19, and an inverter 20. On the other hand, the power supply voltage is converted into each power supply voltage by the rectifier circuit 23 via the power supply transformer 22, and power is supplied to the brake circuit 24, the gate drive circuit 25, the relay circuit 26, the microcomputer circuit 27, and the load detection circuit 28. These circuits are composed of a microcomputer circuit 27 and an input / output circuit 29.
Send and receive signals to and from each other via The gate drive circuit 25 receives the gate signal of the inverter 20 calculated by the microcomputer circuit 27 via the input / output circuit 29, amplifies the signal, and outputs it to the inverter 20.

The brake circuit 24 supplies power to the brake 12 to release the brake 12, and the load detection circuit 28 receives a signal from the load detection device 31 mounted on the car 4 and loads the microcomputer circuit 27 via the input / output circuit 29. Send the detected value. In the event of a power failure, the battery 1 and the battery 2 supply power to the converter 19 via the relay contactors A and B to drive the linear motor 21. Circuit 24
~ 28 power supply voltages are obtained.

Next, a control sequence of the power supply switching circuit of FIG. 1 will be described with reference to FIG. First, the maximum thrust Ld during operation is obtained by the motor thrust calculation circuit 33 from the load detection circuit 28 and the operation direction, and the required slip frequency Fs is obtained by multiplying the motor thrust by the conversion proportional gain Ks of the slip frequency. By adding this to the command value Fm from the speed command generating circuit 34, a primary frequency F1 required for the motor is calculated.

Next, a ratio K (= Vr / Fr) between the rated primary frequency Fr of the motor and the rated voltage Vr is multiplied by F1 to obtain a primary voltage V which must be applied to the motor. If the primary voltage V is within the voltage VA of the battery 1 by the voltage supply determination circuit 35, the relays A and C are turned on and the battery 1 alone supplies power. When V exceeds VA, the relays B and C are turned on, and each circuit 24
To 28 and the battery 1 and 2
9 to supply power to the motor.

By switching the power supply when the motor voltage is insufficient according to the above sequence, it is possible to prevent inoperability. Further, although the present embodiment has been described with respect to the linear motor and the linear motor driven elevator, the power supply is switched in the same manner for a general induction motor,
Driving inability can be prevented.

FIG. 3 shows a case where power is supplied to the motor 21 and each of the circuits 24-28 by an AC power supply 30 such as a private power generator and a transformer 36 as a power supply at the time of a power failure.
The power supply voltage of the motor can be switched by switching the contacts of the relays A and B in exactly the same manner. In particular, in a linear motor driven elevator, the primary frequency of the motor is relatively low, ie, several tens of Hz, and the slip is relatively large.
3 to 0.5) It is possible to prevent the operation from being disabled due to insufficient voltage at low speed operation when performing operation by battery driving or low voltage driving due to power failure or the like.

[0018]

In an induction motor, a linear motor, and an elevator using these as a drive source, when driving at a relatively low voltage, an input voltage required for the motor is obtained from a driving direction, a speed command value, and a load detection value. Switching of the power supply can prevent operation failure.

[Brief description of the drawings]

FIG. 1 is an electric system diagram of a linear motor type elevator according to an embodiment of the present invention.

FIG. 2 is a power supply switching control sequence diagram of the linear motor type elevator according to the embodiment of the present invention.

FIG. 3 is an electric system diagram of a linear motor type elevator according to another embodiment of the present invention.

FIG. 4 is a perspective view showing the structure of a linear motor type elevator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Linear motor movable element, 2 ... Rod, 3 ... Casing frame, 4 ... Car, 5 ... Counterweight, 6 ... Building support member, 7 ... Pulley, 8 ... Main rope, 9 ... Car guide rail, 10 ... Guide rail for counterweight, 1
DESCRIPTION OF SYMBOLS 1 ... Support member, 12 ... Brake, 13 ... Rotary encoder, 14, 15 ... Rod support elastic member, 16 ... Cage roller, 17 ... Balance weight roller, 18 ... Normal power supply, 19 ... Converter, 20 ... Inverter, 21 ... Linear motor, 22 ... Power transformer, 23 ... Rectifier circuit, 24
... Brake circuit, 25 ... Gate drive circuit, 26 ... Relay circuit, 27 ... Microcomputer circuit, 28 ... Load detection circuit,
29: input / output circuit, 30: AC power supply, 31: load detection device, 32: battery inverter, 33: motor thrust calculation circuit, 34: speed command generation circuit, 35: voltage supply determination circuit, 36: transformer.

Claims (5)

[Claims] In an induction motor and a power supply device for an elevator driven by the induction motor, means for instructing the operation direction and speed of the motor, means for detecting the load of the motor or the elevator driven by this motor, and this load A drive power supply for an induction motor and a linear motor, comprising: means for switching the power supply according to the amount. 2. A linear motor and a power supply device for an elevator driven by the linear motor, means for instructing the operating direction and speed of the linear motor, and means for detecting the load on the linear motor or the elevator driven by the linear motor. And a means for switching the power supply device according to the load amount. 3. A power supply device for driving a linear motor and an elevator driven by the linear motor with a battery, means for instructing the operation direction and speed of the linear motor and a load for the linear motor or an elevator driven by the linear motor. A drive power supply for an induction motor and a linear motor, comprising: means for detecting and means for switching the power supply according to the load amount. 4. A linear motor and a power supply device for an elevator driven by the linear motor, means for instructing the operation direction and speed of the linear motor, and means for detecting the load on the linear motor or the elevator driven by the linear motor. A drive power supply for an induction motor and a linear motor, comprising a power supply for rescue operation having means for switching the power supply at the time of a power failure according to the load amount. 5. A linear motor and a power supply device for an elevator driven by the linear motor, a means for instructing a driving direction and a speed of the linear motor, and a means for detecting a load of the linear motor or an elevator driven by the linear motor. A drive power supply for an induction motor and a linear motor, comprising a power supply having means for switching the power supply during low-speed operation according to the load.