JPS62202090U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing the configuration of a brushless motor as one embodiment of the present invention, Fig. 2 is an electric circuit diagram showing another embodiment, and Fig. 3 is an electric circuit showing still another embodiment. 4 are electrical circuit diagrams showing a conventional example. In the figure, 2 and 3 are stator windings, 4 is a Hall IC, 5 is an amplifier, and 6 and 7
8 is a transistor, 8 is an inverter, 9 is a speed changeover switch, 10 is a transistor, 13 is a rotation signal pulse generation circuit, 14 is an integration circuit, 15 is a comparison circuit,
16 is a capacitor, 17 is a transistor, 18,
19, 21, 22, and 23 are resistors, 20 is a capacitor, and 26 is a Zener diode.
Note that the same reference numerals in the figures indicate the same or equivalent parts.

Amendment July 30, 1986 The scope of claims for utility model registration is amended as follows.

[Claims for Utility Model Registration] (1) A multi-phase stator winding, a position detection element that detects the rotational position of a permanent magnet rotor, and a signal to the stator winding based on a signal from the position detection element. A switching element that switches the energization of the stator winding of at least one phase or more is blocked,
a first control means including a speed changeover switch that enables energization control of the remaining stator windings of at least one phase; and a rotation signal pulse generation circuit that generates a number of pulses proportional to the rotation speed of the rotor. , a second control means including an integrator circuit that integrates the pulses of this rotation signal pulse generation circuit and outputs a signal according to the number of rotations, and a comparison circuit that compares the output of this integrator circuit with a predetermined comparison value; The comparison value of the comparison circuit is set to a value corresponding to a lower speed than the normal speed of the low-speed operation by the first control means, and when the output of the integration circuit falls below this comparison value, the output of the comparison circuit is set. A brushless motor characterized by being designed to operate only at high speeds. (2) The rotation signal pulse generation circuit is configured to form pulses from the spike voltage when current is cut off in the stator winding, which is always controlled to be energized by the first control means even when operating at low speed. A brushless motor according to claim 1, characterized in that it is a utility model. (3) The integrating circuit charges the capacitor through the charging/discharging resistor using pulses from the rotation signal pulse generating circuit, and when there is no pulse, discharges the capacitor through the charging/discharging resistor and the discharging resistor. The brushless motor according to claim 1 or 2, characterized in that the brushless motor is configured to output the voltage of this capacitor.

Claims (1)

[Claims for Utility Model Registration] (1) A multi-phase stator winding, a position detection element that detects the rotational position of a permanent magnet rotor, and a signal to the stator winding based on a signal from the position detection element. a switching element that switches the energization of the stator winding and at least one type of stator winding;
a first control means including a speed changeover switch that enables energization control of the remaining stator windings of at least one phase; and a rotation signal pulse generation circuit that generates a number of pulses proportional to the rotation speed of the rotor. , a second control means including an integrator circuit that integrates the pulses of this rotation signal pulse generation circuit and outputs a signal according to the number of rotations, and a comparison circuit that compares the output of this integrator circuit with a predetermined comparison value; The comparison value of the comparison circuit is set to a value corresponding to a lower speed than the normal speed of the low-speed operation by the first control means, and when the output of the integration circuit falls below this comparison value, the output of the comparison circuit is set. A brushless motor characterized by being designed to operate only at high speeds. (2) The rotation signal pulse generation circuit is configured to form pulses from the spike voltage when current is cut off in the stator winding, which is always controlled to be energized by the first control means even when operating at low speed. A brushless motor according to claim 1, characterized in that it is a utility model. (3) The integrating circuit charges the capacitor through the charging/discharging resistor using pulses from the rotation signal pulse generating circuit, and when there is no pulse, discharges the capacitor through the charging/discharging resistor and the discharging resistor. The brushless motor according to claim 1 or 2, characterized in that the brushless motor is configured to output the voltage of this capacitor.