JP3861894B2 - Electric motor - Google Patents

Description

The present invention relates to a method for installing a magnetic velocity sensor in an electric motor such as an induction motor.

  In recent years, in an electric motor such as an induction motor, there has been a demand for speed control, in which a magnet provided on a rotor is rotated together with the rotor, and this magnetic flux change is detected by a magnetic speed sensor installed on the stator. It is increasing.

  On the other hand, there is an increasing demand for thin motors for thin and lightweight products, and it is necessary to incorporate a magnetic velocity sensor into the motor.

  A method for installing such a conventional magnetic velocity sensor will be described with reference to FIG.

  FIG. 4 shows an example of an induction motor with two poles, but the magnetic velocity sensor 1 is installed in an intermediate portion between the main winding 2 and the auxiliary winding 18 and connected to the motor lead wire 4 on the printed circuit board 3. It was.

  However, in the above-described conventional configuration, when the position of the magnetic velocity sensor coincides with the boundary of the magnet (N, S pole) of the sensor magnet provided on the rotor when the motor is started, the motor is applied within a certain time when the applied voltage is low If the motor does not start, and if the applied voltage of the motor is high and the amount of magnetic flux in the winding is higher than the amount of magnetic flux in the sensor magnet, the magnetic speed sensor outputs an abnormal pulse, and the motor is rotating even though the motor is stopped. The product control may determine that the applied voltage is reduced and the motor may not start. For this purpose, it is possible to use a product control system that does not use the magnetic velocity sensor signal at startup, or a method in which the magnetic flux of the sensor magnet is made higher than the magnetic flux of the winding. There was a problem that the range of use was restricted and the model development was hindered.

In the present invention, in order to solve the above-described conventional problems, the position of the magnetic velocity sensor is installed at a position where the distribution of the magnetic flux of the stator is small. Specifically, it has a stator, a magnetic speed sensor, and a sensor magnet that are separated by separating a main winding and an auxiliary winding by a toroidal winding, and the magnetic speed sensor is arranged only in the main winding. And it is an electric motor characterized by being installed in the pole center of the main winding.

  With this configuration, it is possible to provide a high-performance motor that is small and has a wide range of use without causing the magnetic velocity sensor to output an abnormal pulse when the motor is started, so that the motor does not start.

  As is apparent from the above description, the present invention provides a motor with a small size, a wide range of use, and high speed accuracy by installing the position of the magnetic velocity sensor at the center of the pole where the magnetic flux distribution of the winding is small.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view of a finished winding product showing the installation position of the magnetic velocity sensor 1 in the embodiment of the present invention. The magnetic velocity sensor 1 is installed at the center of the pole where the magnetic flux distribution of the main winding 2 of the toroidal winding is small, and is connected to the motor lead wire 4 on the printed circuit board 3.

  FIG. 2 is a half sectional view of a phase control induction motor using the present invention. Reference numeral 5 denotes a finished stator product, which includes a stator core 6, a toroidal winding 7, a resin 8, and a magnetic speed sensor 1. Reference numeral 9 denotes a finished rotor, which is composed of a speed detection magnet 10, a rotor 11, and a rotating shaft 12. The finished rotor product 9 is rotatably fixed to the finished stator product 5 via the bearing device 13.

  The magnetic speed sensor 1 is disposed at a position facing the speed detection magnet 10.

  With the above configuration, when the rotor finished product 9 rotates, the speed detection magnet 10 also rotates at a concentric speed, and a speed signal is obtained by the magnetic speed sensor 1 disposed in the stator finished product 5.

  Thus, as shown in FIG. 3, the speed signal 14 is input to the phase control circuit 15 and the phase induction motor 17 is controlled by the output 16 of the phase control circuit 15 so that the phase control induction motor 17 has high speed accuracy. Can be obtained.

  The present invention relates to an installation location of a magnetic sensor for detecting the rotational speed of an induction motor.

The perspective view of the coil | winding completed product which shows the installation position of the magnetic velocity sensor in one Example of this invention The half sectional view of the phase control induction motor in one example of the present invention Block diagram of phase control induction motor and phase control circuit of the present invention Perspective view of the finished winding product showing the installation position of the conventional magnetic velocity sensor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic speed sensor 2 Main winding 3 Printed circuit board 4 Electric motor exit wire 5 Stator finished product 6 Stator core 7 Toroidal winding 8 Resin 9 Rotor finished product 10 Speed detection magnet 11 Rotor 12 Rotating shaft 13 Bearing device 14 Speed signal 15 Phase control circuit 16 Output 17 Phase control induction motor 18 Auxiliary winding

Claims (1)

A stator, a magnetic velocity sensor, and a sensor magnet, which are separated from a main winding and an auxiliary winding by a toroidal winding , the magnetic velocity sensor is disposed only in the main winding, and that electrostatic motivation to, characterized in that installed in pole center of the main winding.

Images