JPS60212127A - Cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a cooking appliance having a function of preventing burnout of an electric motor.

Structure of conventional examples and their problems Conventionally, electric cookers, such as the mixer shown in Figure 1, rotate a cutter inside a container with a rotating horn from an electric motor to crush and cut the material. The cooker is
The load condition changes greatly depending on the quality and darkness of the material. Therefore, in order to prevent the motor from being burnt out due to continued overload or locking, an overcurrent breaker 1 is installed as shown in Figure 2. An overcurrent also flows through the overcurrent detection element of the overcurrent breaker 1, which causes self-heating to deform its shape, and this deformation interrupts the circuit.

However, in such a conventional configuration, due to variations in the performance of the overcurrent detection element, there is a load current that must be cut off to prevent burnout of the motor, and a load current that is necessary for crushing and cutting the material and must be cut off. If there is a small difference in the current value between the load current and the load current that must be cut off, the overcurrent breaker 1 may not operate even if an overcurrent that must be cut off flows, causing the motor to burn out, or conversely, Phenomena such as a so-called premature cut-off state in which the overcurrent breaker 1 operates even though the material is being crushed and cut has occurred. In FIG. 2, 3 is a commercial power source and 4 is a power switch.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and an object of the present invention is to provide a cooking appliance that can eliminate premature burnout and reliably prevent burnout.

Structure of the Invention In order to achieve the above-mentioned object, the cooking appliance of the present invention includes an electric motor, an overcurrent breaker connected to the electric motor, and an overcurrent breaker that detects the temperature of the electric motor and disconnects the overcurrent breaker when overheating is detected. The structure includes a temperature detection/overcurrent breaker operation circuit that supplies sufficient operating current to the circuit.

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

FIG. 3 is a circuit block diagram of the main parts of the cooker in one embodiment of the present invention, in which 5 is a commercial power supply, 6 is a power switch, 7 is an electric motor, 8 is an overcurrent breaker, and 9 is a temperature detection/overcurrent breaker. This is a breaker operating circuit.

The temperature detection/overcurrent breaker operation circuit 9 has a humidity detection section 9a that detects the temperature of the windings of the motor 7, and this humidity detection section 9a detects the temperature of the motor windings to prevent burnout. When it is detected that the temperature has exceeded a predetermined constant temperature, the overcurrent breaker 8 cuts an excessive current that can completely absorb the variation in the performance of the overcurrent breaker 8 from point a.
The overcurrent cutoff 118 is turned on to cut off the excessive current while preventing the electric motor 1fi7 from being burnt out due to excessive current by a bypass circuit that branches off from point b.

In other words, the temperature of the electric motor 117 is reliably detected and the circuit is immediately cut off before it burns out. The characteristics of the overcurrent breaker 8 are set to the overcurrent side (+5 <.

Further, in the case of locking, etc., the overcurrent breaker 8 detects an excessive overload current and interrupts the circuit before the winding temperature rises.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, according to the present invention, even if the characteristics of the overcurrent breaker vary to some extent, the circuit is cut off by the temperature rise of the motor regardless of the variation, thereby reliably preventing burnout of the motor. Can be done. Moreover, premature breakage can be prevented at the same time.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a mixer as an example of a cooking device;
FIG. 2 is a circuit block diagram of a conventional cooking device, and FIG. 3 is a circuit block diagram of essential parts of a cooking device according to an embodiment of the present invention. 7...Electric motor, 8...Overcurrent breaker, 9...Temperature detection/overcurrent breaker operating circuit, 9a...Temperature detection section representative Yoshihiro Morimoto Figure f

Claims (1)

[Claims] 1. An electric motor, an overcurrent breaker connected to the electric motor, and a temperature detection/overcurrent breaker operating circuit that detects the temperature of the electric motor and supplies sufficient operating current to the overcurrent breaker when overheating is detected. A cooker equipped with.