CN115000916A - Over-temperature protection circuit applied to synchronous reluctance motor - Google Patents

Abstract

The invention belongs to the technical field of motor temperature control application, and particularly discloses an over-temperature protection circuit applied to a synchronous reluctance motor, which comprises a synchronous reluctance controller wiring terminal, a thermocouple and a temperature signal wire, wherein two ends of the temperature signal wire are respectively connected with the synchronous reluctance controller wiring terminal and the thermocouple, the thermocouple is arranged in an U, V, W three-phase coil of the synchronous reluctance motor, and the over-temperature protection circuit comprises an IU (interface unit) direction normally open circuit, an IV (interface unit) comparison circuit, an IW (interface unit) direction normally open circuit and an IW comparison circuit. The invention has the beneficial effects that: the over-temperature protection circuit is simple in design, efficient and accurate, achieves the purpose that the internal temperature of the motor is reflected fast, effectively controls and protects the synchronous reluctance motor, can judge whether the motor is over-temperature in the first time, timely controls the operation and stop of the motor, avoids the damage to the motor and reduces the cost, utilizes a simple and effective circuit to safely control the motor system, and reduces the cost and other maintenance expenses.

Description

Over-temperature protection circuit applied to synchronous reluctance motor

Technical Field

The invention belongs to the technical field of motor temperature control application, and particularly relates to an over-temperature protection circuit applied to a synchronous reluctance motor, which is used for carrying out safety protection on the synchronous reluctance motor under industrial automatic control.

Background

The safety accidents caused by the overheating of the motor often occur, corresponding safety measures need to be taken, and the ordinary motor detects the temperature based on the thermistor to provide an overheating protection device, so that the automatic circuit breaking can achieve the protection purpose.

When the motor is produced and assembled, a PTC thermistor is arranged in the coil and used for monitoring the temperature in the motor, and the resistance value is very small under the principle of the PTC thermistor, when the temperature reaches the Curie temperature, the resistance value is in step jump rise (equivalent to circuit breaking) and is matched with a relay for monitoring to lose power, a switching signal is generated, a circuit is disconnected, the motor stops working, and the purpose of protecting the motor is achieved by normally adopting the mode by a common motor.

At present, through increasing thermistor and heat and continuing protection device, prevent that the motor from the excess temperature, burning out the motor, be the effective mode of a common protection motor. But it has the following disadvantages: 1. extra equipment, a thermistor and a thermal relay are required to be added, so that the cost is high, the maintenance cost is high, and the labor cost is wasted; 2. when the protection device runs for a long time and is seriously aged and fails, the coil in the motor is indirectly seriously heated, so that the internal insulation of the motor is damaged; 3. heat in the conventional motor overheating protection device is absorbed frequently and is easy to generate electric ignition, so that the current overload of the whole circuit system can be caused, and the whole circuit can be burnt seriously; 4. the overheat protection device has the advantages of laggard precision, complex circuit system, frequent replacement and maintenance of components and parts and difficult troubleshooting of workers.

Therefore, in view of the above problems, the present invention provides an overheat protection circuit applied to a synchronous reluctance motor.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide an over-temperature protection circuit applied to a synchronous reluctance motor, which solves the technical problems in the background technology, such as frequent failure, aging, difficult manual inspection and maintenance, poor sensitivity, complex circuit and the like of a common temperature protection device.

The technical scheme is as follows: the invention provides an over-temperature protection circuit applied to a synchronous reluctance motor, which comprises a synchronous reluctance controller wiring terminal, a thermocouple and a temperature signal wire, wherein two ends of the temperature signal wire are respectively connected with the synchronous reluctance controller wiring terminal and the thermocouple, the thermocouple is arranged in an U, V, W three-phase coil of the synchronous reluctance motor, and the over-temperature protection circuit comprises an IU-direction normally open circuit, an IU comparison circuit, an IV-direction normally open circuit, an IV comparison circuit, an IW-direction normally open circuit and an IW comparison circuit, wherein the IU comparison circuit, the IV comparison circuit and the IW comparison circuit are respectively connected with the synchronous reluctance controller wiring terminal, and the IU-direction normally open circuit, the IV-direction normally open circuit and the IW-direction normally open circuit are respectively connected with the IU comparison circuit, the IV comparison circuit and the IW comparison circuit.

In the technical scheme, the IU comparison circuit comprises a resistor R68, a dual operational amplifier U1, a resistor R37, a capacitor C5, a capacitor C15, a resistor R63, a resistor R43 and a capacitor C23, wherein two ends of the resistor R68 are respectively connected with an output end of a connecting terminal of a synchronous reluctance controller and an input end of the dual operational amplifier U1, the resistor R37 is connected with an input end of the dual operational amplifier U1, the capacitor C5, the capacitor C15 and the resistor R63 are respectively connected with an output end of the dual operational amplifier U1, the resistor R37 and the resistor R63 are respectively connected with the resistor R43, one end of the resistor R43 is connected with the capacitor C15, and the capacitor C23 is connected to one side of the resistor R43 in parallel; the IU-direction normally-open circuit comprises a resistor R55, a resistor R53, a resistor R54 and a capacitor C21, wherein two ends of the resistor R53 are respectively connected with the resistor R68 and the capacitor C21, the resistor R55 is arranged on one side of the resistor R68 in parallel, the resistor R54 is arranged on one side of the resistor R53 in parallel, and two ends of the resistor R54 are respectively connected with the capacitor C21.

In the technical scheme, the IV comparison circuit includes a resistor R56, a dual operational amplifier U2, a resistor R42, a capacitor C7, a capacitor C16, a resistor R64, a resistor R49, and a capacitor C24, wherein two ends of the resistor R56 are respectively connected to an output end of the synchronous reluctance controller connection terminal 10 and an input end of the dual operational amplifier U2, the resistor R42 is connected to an input end of the dual operational amplifier U2, the capacitor C7, the capacitor C16, and the resistor R64 are respectively connected to an output end of the dual operational amplifier U2, the resistor R42 and the resistor R64 are respectively connected to the resistor R49, one end of the resistor R49 is connected to the capacitor C16, and the capacitor C24 is connected to one side of the resistor R49 in parallel; the IV-direction normally-open circuit comprises a resistor R69, a resistor R57, a resistor R58 and a capacitor C22, wherein two ends of the resistor R69 are respectively connected with a resistor R56 and a resistor R57, the resistor R58 is arranged on one side of the resistor R57 in parallel, and two ends of the resistor R58 are respectively connected with a capacitor C22.

In the technical scheme, the IW comparison circuit comprises a resistor R59, a dual operational amplifier U3, a resistor R48, a capacitor C8, a capacitor C17, a resistor R65, a resistor R50 and a capacitor C26, wherein two ends of the resistor R59 are respectively connected with an output end of a synchronous reluctance controller connection terminal 10 and an input end of the dual operational amplifier U3, the resistor R48 is connected with an input end of the dual operational amplifier U2, the capacitor C8, the capacitor C17 and the resistor R65 are respectively connected with an output end of the dual operational amplifier U2, the resistor R48 and the resistor R65 are respectively connected with a resistor R50, one end of a resistor R50 is connected with the capacitor C17, and the capacitor C26 is connected to one side of the resistor R50 in parallel; the IW normally-open circuit comprises a resistor R70, a resistor R60, a resistor R61 and a capacitor C25, wherein two ends of the resistor R80 are respectively connected with the resistor R59 and the resistor R60, the resistor R61 is arranged on one side of the resistor R60 in parallel, and two ends of the resistor R61 are respectively connected with the capacitor C25.

In the present embodiment, the thermocouple 20 includes but is not limited to a PT100 thermocouple, and the dual operational amplifiers U1, U2, and U3 include but is not limited to a PT100TL 082C.

Compared with the prior art, the over-temperature protection circuit applied to the synchronous reluctance motor has the beneficial effects that: 1. the over-temperature protection circuit is simple in design, efficient and accurate, the internal temperature of the motor is reflected quickly, the synchronous reluctance motor is effectively controlled and protected, whether the motor is over-temperature or not can be judged at the first time, the operation and the stop of the motor are controlled in time, and the motor is prevented from being damaged; 2. additional auxiliary equipment of a heat relay and a time relay is not required to be added, the cost is reduced, and a simple and effective circuit is utilized to safely control the motor system; 3. the synchronous reluctance motor is convenient for field workers to simply operate, and the cost and other maintenance expenses are reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of the connection structure of the connecting terminal, the thermocouple and the temperature signal wire of the synchronous reluctance controller applied to the over-temperature protection circuit of the synchronous reluctance motor;

FIG. 2 is an electrical schematic of the over-temperature protection circuit of the present invention applied to a synchronous reluctance machine;

wherein, the sequence numbers in the figure are as follows: 10-synchronous reluctance controller connecting terminal, 20-thermocouple and 30-temperature signal line.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

In the description of the present invention, it is to be noted that the terms "top", "bottom", "one side", "the other side", "front", "rear", "middle", "inside", "top", "bottom", "front", "rear", "intermediate", "inner", "top", "bottom", "top", "bottom", "top", "bottom", "top", "bottom", "top", "bottom", "top", "bottom", "top", "bottom", "top", "bottom", and "or" are used in the "or" in a substrate "

The bottom "and the like indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

Example one

The over-temperature protection circuit applied to the synchronous reluctance motor as shown in fig. 1 and fig. 2 comprises a synchronous reluctance controller terminal 10, a thermocouple 20 and a temperature signal line 30, wherein two ends of the temperature signal line 30 are respectively connected with the synchronous reluctance controller terminal 10 and the thermocouple 20, the thermocouple 20 is arranged inside U, V, W three-phase coils of the synchronous reluctance motor, and the over-temperature protection circuit comprises an IU-direction normally open circuit, an IU comparison circuit, an IV-direction normally open circuit, an IV comparison circuit, an IW-direction normally open circuit and an IW comparison circuit, wherein the IU comparison circuit, the IV comparison circuit and the IW comparison circuit are respectively connected with the synchronous reluctance controller terminal 10, and the IU-direction normally open circuit, the IV-direction normally open circuit and the IW-direction normally open circuit are respectively connected with the IU comparison circuit, the IV comparison circuit and the IW comparison circuit.

Example two

Preferably, based on the first embodiment, the IU comparison circuit includes a resistor R68, a dual operational amplifier U1, a resistor R37, a capacitor C5, a capacitor C15, a resistor R63, a resistor R43, a capacitor C23,

the two ends of the resistor R68 are respectively connected with the output end of the synchronous reluctance controller connecting terminal 10 and the input end of the double operational amplifier U1, the resistor R37 is connected with the input end of the double operational amplifier U1, and the capacitor C5, the capacitor C15 and the resistor R63 are respectively connected with the double operation amplifier

The output end of the operational amplifier U1 is connected, the resistor R37 and the resistor R63 are respectively connected with the resistor R43, one end of the resistor R43 is connected with the capacitor C15, and the capacitor C23 is connected to one side of the resistor R43 in parallel;

the IU-direction normally-open circuit comprises a resistor R55, a resistor R53, a resistor R54 and a capacitor C21, wherein two ends of the resistor R53 are respectively connected with the resistor R68 and the capacitor C21, the resistor R55 is arranged on one side of the resistor R68 in parallel, the resistor R54 is arranged on one side of the resistor R53 in parallel, and two ends of the resistor R54 are respectively connected with the capacitor C21.

EXAMPLE III

Preferably, in the first embodiment or the second embodiment, the IV comparator circuit includes a resistor R56, a dual operational amplifier U2, a resistor R42, a capacitor C7, a capacitor C16, a resistor R64, a resistor R49, and a capacitor C24,

the two ends of the resistor R56 are respectively connected with the output end of the synchronous reluctance controller connecting terminal 10 and the input end of the double operational amplifier U2, the resistor R42 is connected with the input end of the double operational amplifier U2, the capacitor C7, the capacitor C16 and the resistor R64 are respectively connected with the output end of the double operational amplifier U2, the resistor R42 and the resistor R64 are respectively connected with the resistor R49, one end of the resistor R49 is connected with the capacitor C16, and the capacitor C24 is connected to one side of the resistor R49 in parallel;

the IV-direction normally-open circuit comprises a resistor R69, a resistor R57, a resistor R58 and a capacitor C22,

the two ends of the resistor R69 are respectively connected with the resistor R56 and the resistor R57, the resistor R58 is arranged on one side of the resistor R57 in parallel, and the two ends of the resistor R58 are respectively connected with the capacitor C22.

Example four

Preferably, in the first embodiment or the second embodiment or the third embodiment, the IW comparator circuit includes a resistor R59, a dual operational amplifier U3, a resistor R48, a capacitor C8, a capacitor C17, a resistor R65, a resistor R50, a capacitor C26,

the two ends of the resistor R59 are respectively connected with the output end of the synchronous reluctance controller connecting terminal 10 and the input end of the double operational amplifier U3, the resistor R48 is connected with the input end of the double operational amplifier U2, the capacitor C8, the capacitor C17 and the resistor R65 are respectively connected with the output end of the double operational amplifier U2, the resistor R48 and the resistor R65 are respectively connected with the resistor R50, one end of the resistor R50 is connected with the capacitor C17, and the capacitor C26 is connected to one side of the resistor R50 in parallel;

the IW normally-open circuit comprises a resistor R70, a resistor R60, a resistor R61 and a capacitor C25,

the two ends of the resistor R80 are respectively connected with the resistor R59 and the resistor R60, the resistor R61 is arranged on one side of the resistor R60 in parallel, and the two ends of the resistor R61 are respectively connected with the capacitor C25.

Preferably, in the above embodiment of the present structure, the thermocouple 20 includes, but is not limited to, a PT100 thermocouple, and the dual operational amplifiers U1, U2, U3 include, but is not limited to, a PT100TL 082C.

The over-temperature protection circuit applied to the synchronous reluctance motor has the following working principle or structure principle:

the (PT100) temperature line of the thermocouple 20 is embedded inside the three-phase coil of the synchronous reluctance motor U, V, W, wherein the synchronous reluctance controller terminal 10 and the (PT100) temperature line of the thermocouple 20 inside the synchronous reluctance motor are connected by the temperature signal line 30.

In addition, an over-temperature protection circuit (an over-temperature protection circuit of the synchronous reluctance motor) is integrated in an internal driver of the synchronous reluctance controller (the internal driver is preset on a control panel of the synchronous reluctance controller and is connected with a connecting terminal 10 of the synchronous reluctance controller through a signal wire) to control the start and stop (over-temperature) of the motor.

When the internal temperature of the synchronous reluctance motor is greater than a set temperature protection value (set by a synchronous reluctance controller), an over-temperature signal generated by a thermocouple 20(PT100) is fed back to an over-temperature protection circuit in the controller, wherein the panel of the synchronous reluctance controller gives an over-temperature alarm;

when the current enters the IU comparison circuit, the IV comparison circuit and the IW comparison circuit through the synchronous reluctance controller wiring terminal 10 (the resistor R68, the resistor R56, the resistor R59 and the like play a role in limiting current), the current respectively enters the double operational amplifier U1, the double operational amplifier U2 and the double operational amplifier, when the current is smaller than a set value, the current finally flows to a-15 v to a grounding terminal through a normally open circuit, if the current is larger than the set value, the current is fed back to the synchronous reluctance controller wiring terminal 10, and the current is fed back to a CPU (a synchronous reluctance controller CPU, which is not marked in the figure) of the synchronous reluctance controller through the synchronous reluctance controller wiring terminal 10, and the over-temperature error reporting is carried out (an early warning panel is preset on the synchronous reluctance controller).

The CPU, the early warning panel and the internal driving program in the technical scheme are all preset in the synchronous reluctance controller (all in the prior art).

The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.

Claims (5)

1. Be applied to synchronous reluctance machine's excess temperature protection circuit, including synchronous reluctance controller binding post (10), thermocouple (20), temperature signal line (30), the both ends of temperature signal line (30) are connected with synchronous reluctance controller binding post (10), thermocouple (20) respectively, and thermocouple (20) set up inside U, V, W three-phase coil of synchronous reluctance machine, its characterized in that: the over-temperature protection circuit comprises an IU (International Union bus) normally-open circuit, an IU (International Union bus) comparison circuit, an IV normally-open circuit, an IV comparison circuit, an IW normally-open circuit and an IW comparison circuit, wherein the IU comparison circuit, the IV comparison circuit and the IW comparison circuit are respectively connected with a wiring terminal (10) of the synchronous reluctance controller, and the IU normally-open circuit, the IV normally-open circuit and the IW normally-open circuit are respectively connected with the IU comparison circuit, the IV comparison circuit and the IW comparison circuit.

2. The over-temperature protection circuit applied to the synchronous reluctance motor according to claim 1, wherein: the IU comparison circuit comprises a resistor R68, a double operational amplifier U1, a resistor R37, a capacitor C5, a capacitor C15, a resistor R63, a resistor R43 and a capacitor C23, wherein two ends of the resistor R68 are respectively connected with an output end of a synchronous reluctance controller connecting terminal (10) and an input end of a double operational amplifier U1, the resistor R37 is connected with an input end of the double operational amplifier U1, the capacitor C5, the capacitor C15 and the resistor R63 are respectively connected with an output end of the double operational amplifier U1, the resistor R37 and the resistor R63 are respectively connected with a resistor R43, one end of a resistor R43 is connected with the capacitor C15, and the capacitor C23 is connected to one side of the resistor R43 in parallel; the IU-direction normally-open circuit comprises a resistor R55, a resistor R53, a resistor R54 and a capacitor C21, wherein two ends of the resistor R53 are respectively connected with the resistor R68 and the capacitor C21, the resistor R55 is arranged on one side of the resistor R68 in parallel, the resistor R54 is arranged on one side of the resistor R53 in parallel, and two ends of the resistor R54 are respectively connected with the capacitor C21.

3. The over-temperature protection circuit applied to the synchronous reluctance motor according to claim 1, wherein: the IV comparison circuit comprises a resistor R56, a double operational amplifier U2, a resistor R42, a capacitor C7, a capacitor C16, a resistor R64, a resistor R49 and a capacitor C24, wherein two ends of the resistor R56 are respectively connected with an output end of a synchronous reluctance controller connecting terminal (10) and an input end of a double operational amplifier U2, the resistor R42 is connected with an input end of the double operational amplifier U2, the capacitor C7, the capacitor C16 and the resistor R64 are respectively connected with an output end of the double operational amplifier U2, the resistor R42 and the resistor R64 are respectively connected with a resistor R49, one end of a resistor R49 is connected with the capacitor C16, and the capacitor C24 is connected to one side of the resistor R49 in parallel; the IV is to normally open circuit including resistance R69, resistance R57, resistance R58, electric capacity C22, wherein, resistance R69's both ends are connected with resistance R56, resistance R57 respectively, and resistance R58 connects in parallel and sets up in resistance R57 one side, and both ends are connected with electric capacity C22 respectively.

4. The over-temperature protection circuit applied to the synchronous reluctance motor according to claim 1, wherein: the IW comparison circuit comprises a resistor R59, a double operational amplifier U3, a resistor R48, a capacitor C8, a capacitor C17, a resistor R65, a resistor R50 and a capacitor C26, wherein two ends of the resistor R59 are respectively connected with the output end of a synchronous reluctance controller connecting terminal (10) and the input end of the double operational amplifier U3, the resistor R48 is connected with the input end of the double operational amplifier U2, the capacitor C8, the capacitor C17 and the resistor R65 are respectively connected with the output end of the double operational amplifier U2, the resistor R48 and the resistor R65 are respectively connected with the resistor R50, one end of a resistor R50 is connected with the capacitor C17, and the capacitor C26 is connected to one side of the resistor R50 in parallel; the IW normally-open circuit comprises a resistor R70, a resistor R60, a resistor R61 and a capacitor C25, wherein two ends of the resistor R80 are respectively connected with the resistor R59 and the resistor R60, the resistor R61 is arranged on one side of the resistor R60 in parallel, and two ends of the resistor R61 are respectively connected with the capacitor C25.

5. The over-temperature protection circuit applied to the synchronous reluctance motor according to claim 1, wherein: the thermocouple (20) includes, but is not limited to, a PT100 thermocouple, the dual operational amplifier U1, the dual operational amplifier U2, the dual operational amplifier U3 include, but is not limited to, a PT100TL 082C.

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