JPH0423510B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a linear hybrid motor having both the functions of a linear pulse motor and a linear induction motor.

In general, linear induction motors have a large starting thrust and control force, so they are suitable as motors for high acceleration/deceleration, but are not suitable as motors for stopping at fixed points. On the other hand, a linear pulse motor can easily stop at a fixed point and has the function of self-holding the stop position, but its movement speed is slow. As described above, linear induction motors and linear pulse motors have contradictory advantages and disadvantages.

There is already a concept of a linear hybrid motor that combines the two, using a linear induction motor in the high-speed range and a pulse motor in the low-speed range to bring out the best of both worlds.
Many motors simply combine the two mechanically, and the extent to which excitation coils and the like are commonly used is low, resulting in a disadvantage that the motor becomes large.

This invention was made to improve such drawbacks, and by sharing the primary and secondary sides and switching the excitation coil, it is possible to convert from a linear induction motor to a linear pulse motor, or vice versa. It is an object of the present invention to provide a small linear hybrid motor that can be changed and has a high rate of common use of stators and excitation coils.

This invention will be explained in detail below along with embodiments shown in the drawings. FIG. 1 shows a perspective view of an embodiment of the invention, and FIG. 2 shows a longitudinal sectional view thereof. Reference numeral 1 denotes a stator, and a running element 5 is adapted to move linearly on the stator 1 by receiving a current from a line 3.

As shown in detail in FIGS. 3 and 4, the stator 1 is made of laminated silicon steel plates, and has a structure in which a large number of magnetic poles 7 protrude independently. A conductor 9 is made of a non-ferrous metal, such as aluminum or copper, and has a hole 11 formed in a portion corresponding to each magnetic pole 7. A radiation fin 13 is provided around the conductor 9 to increase the area of contact with the air. Then, connect the magnetic pole 7 to the hole 1.
The stator 1 and this conductor 9 are combined so as to fit into each other.

The mover 5 has a magnetic circuit consisting of a coil 17 wound around a magnetic pole 15 made of a laminated silicon steel plate, and is installed in a steel body 19, and the pole teeth 21 are connected to the magnetic pole 15 from this body 19.
It has a configuration in which it extends parallel to the The pole teeth 21 are shifted by 1/3 pitch compared to the stator 1. The tip of the pole tooth 21 is widened to allow magnetic flux to pass through easily.

The operation of this linear hybrid motor will be explained next. When used as a linear induction motor, the coil 17 of the mover 5 is
By applying a phase AC power supply, the secondary conductor 9
An eddy current is generated locally due to the excitation force of each magnetic pole 15, causing a delay in the magnetic flux, giving a thrust to the movable element, and driving the movable element 5 at high speed.

Also, when used as a linear pulse motor,
The movable element 5 is driven by sequentially applying three-phase pulsed power to three sets of magnetic circuits. With this drive, 1/6 pitch step is possible with 1-2 phase excitation.

A linear hybrid motor having such a configuration uses a function as a linear induction motor for high-speed driving, and uses a function as a linear pulse motor for positioning control.

Next, a method of controlling this linear hybrid motor will be explained. FIG. 5 shows details of the motor control circuit, FIG. 6 shows details of the power supply switching circuit a of FIG. 5, and FIG. 7 shows a standard operation diagram of the motor. In FIG. 5, the control circuit 23
For example, the stop position is determined by calculating the signal input from the outside, such as the travel distance, to what extent the high-speed drive as an induction motor is performed, at what point it is switched to deceleration mode, and then to what low-speed drive it is possible to switch to the function as a pulse motor. It then issues the necessary commands to the power supply switching circuit a.

In other words, to explain with reference to FIG. 7, a starting signal is issued by applying three-phase AC power at the zero point, and three-phase AC from the triple modulation circuit 25 passes through the demodulation circuit 27 to ignite the excitation circuit 29 of the motor. death,
The linear hybrid motor LHM is started as a linear induction motor until the movable element 5 reaches a constant speed at point A.

Once the movable element 5 reaches a constant speed, three-phase alternating current continues to be applied, and constant flux drive continues as a linear induction motor until it is detected that the position signal from the position sensor 31 has reached the deceleration start point B. .

When it is detected that the deceleration starting point B has been reached,
The control circuit 23 issues a deceleration command signal, and the power supply switching circuit a switches to reverse-phase AC power or a power source in which reverse-phase AC and pulse power are superimposed, and applies it to the excitation circuit 29, and the speed center 33 detects the movable element. The motor LHM is decelerated as an induction motor until the speed of No. 5 becomes the synchronous speed.

From the point C, the control circuit 23 issues a function switching signal to the linear pulse motor to the power supply switching circuit a, and the triple modulation circuit 25 applies three-phase pulse power to the excitation circuit 29, and moves to a predetermined stop position S. The linear motor LHM is driven as a linear pulse motor until the sensor 31 detects the detection.

In the stopped state after the movable element 5 is stopped, the control circuit 23 issues a stop instruction signal and the power switching circuit a
to switch to DC power supply, and triple modulation circuit 2
5 applies a DC bias current to the excitation circuit 29.

Now, to explain the details of the power supply switching circuit a, in FIG. LIM/LPM switching circuit 41 depending on the linear induction motor (LIM) function or linear pulse motor (LPM) function selected at the same time.
In this way, the excitation circuit 29 receives three-phase alternating current, reverse-phase alternating current (or a pulse current superimposed thereon),
By selectively applying one of the pulse currents, the linear hybrid motor LHM is caused to perform the necessary operation.

As can be understood from the above description of the embodiments, the present invention is to provide a linear hybrid motor having both the functions of a linear pulse motor and a linear induction motor, with a stator 1 made of a magnetic material and one side thereof. A large number of magnetic poles 7 are provided protrudingly, and a conductor 9 made of non-ferrous metal and provided with a large number of holes 11 corresponding to each of the magnetic poles 7 is provided on one side of the stator 1 in combination. A plurality of pole teeth 21 are provided on the main body 19 of the movable element 5, which are movably provided facing each other, with the pitch appropriately shifted relative to the pitch of the magnetic poles 7, and a plurality of magnetic poles are provided between each pole tooth 21. 15 is provided with a primary side coil 17, and a pulse generating circuit 37 and an alternating current generating circuit 39 are provided.
and a pulse current generated by the pulse generating circuit 37 or the alternating current generating circuit 3
A power supply switching circuit a is provided for applying to each coil 17 an alternating current generated from the coil 9 or a current obtained by superimposing a pulse current on the alternating current.

As is clear from the above configuration, the linear hybrid motor according to the present invention has the functions of both a Niria pulse motor and a linear induction motor, so it goes without saying that it has the advantages of both. In the invention, as is clear from the above structure, the primary side coil 17 and the secondary side are shared by the linear pulse motor and the linear induction motor, so the overall structure can be made smaller. is easy. Further, it is easy to control the motor by superimposing pulsed current on alternating current, and it is also easy to control the motor by superimposing pulsed current on alternating current.

In addition, when using this linear hybrid motor, the function as a linear induction motor is used for high-speed drive, and the function as a linear pulse motor is used for positioning, so high-speed drive and high-precision positioning can be achieved. It has characteristics.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the Nilia hybrid motor of the present invention, Fig. 2 is an enlarged cross-sectional view of the opposing portion of the stator and movable element of the same embodiment, and Fig. 3 is an enlarged sectional view of the stator of the same embodiment. 4 is an enlarged sectional view of the same stator as above, FIG.
FIG. 7 is a detailed block diagram of the power supply switching circuit a in the figure, and FIG. 7 is a reference operating diagram of the motor in the same embodiment. (Explanation of symbols representing main parts of drawings), 1...
... Stator, 3 ... Line, 5 ... Mover, 7 ... Magnetic pole, 9 ... Conductor, 11 ... Hole, 13 ... Heat dissipation fin.

Claims (1)

[Claims] 1. A linear hybrid motor having the functions of both a linear pulse motor and a linear induction motor, with a large number of magnetic poles 7 protruding from one side of a stator 1 made of a magnetic material, , a conductor 9 made of non-ferrous metal and having a large number of holes 11 corresponding to each of the magnetic poles 7 is provided in combination, and the main body 19 of the mover 5 is movably provided opposite to the stator 1. A plurality of pole teeth 21 are provided with the pitch appropriately shifted from the pitch of the magnetic pole 7, and a plurality of magnetic poles 15 are provided between each pole tooth 21.
are each provided with a primary side coil 17, and are equipped with a pulse generating circuit 37 and an alternating current generating circuit 39, and the pulse current generated by the pulse generating circuit 37, the alternating current generated from the alternating current generating circuit 39, or the above alternating current. a power supply switching circuit a that applies a current obtained by superimposing a pulse current to each coil 17;
A linear vibrid motor characterized by being provided with.