JPS6284390U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a partial block circuit diagram showing the overall configuration of a constant speed control device for a multi-phase motor according to the present invention together with the motor, and Fig. 2 shows a waveform conversion circuit and a logic operation circuit, which are the main parts of the configuration of the present invention. A circuit diagram showing a specific example of the configuration, FIG. 3 is a waveform diagram of each signal in FIG. 2,
FIG. 4 and subsequent figures show the prior art. FIG. 4 is a block circuit diagram of a conventional constant speed control device, and FIG. 5 is a perspective view showing the main parts of a speed signal transmitter used in the conventional device. . In the figure, 1: Motor with multiple phase configuration, 2: Phase coil, 10
: Position detector, 11 to 13: Hall element as a detector, 20: Drive circuit, 21: Switching instruction section of drive circuit, 27: Switching section of drive circuit, 30: Waveform conversion circuit, 31 to 33: Waveform conversion Comparator as an example of circuit configuration, 40: logic operation circuit, CS: control signal, FS: speed signal, P
S: position signal, RS, RS1 to RS3: reference signal, T: rotation period.

Claims (1)

[Scope of utility model registration request] A position detector is provided for each phase in order to detect the current position of the rotor of a multi-phase motor equipped with a plurality of phase coils, and a plurality of position signals outputted from the position detector are received and processed. a drive circuit that sequentially switches the current flowing through each phase coil based on the above-mentioned position signals, and a waveform conversion circuit that receives position signals from each of the position detectors and converts the signals into pulse-like reference signals having a constant duty ratio synchronized therewith. a logical operation circuit that receives a plurality of reference signals from the waveform conversion circuit and performs logical operations between the signals to generate a speed signal as a train of pulses that is repeated multiple times within one rotation period of the motor; a speed control circuit that receives a speed signal from an arithmetic circuit, detects a fluctuation in the motor speed from the signal, and issues a control signal to the drive circuit to correct it, and controls the speed fluctuation that may occur within one rotation period of the motor. 1. A constant speed control device for a multi-phase motor, characterized in that it is capable of correcting at any time.