CN2423676Y

CN2423676Y - Electric motor with superheating protector

Info

Publication number: CN2423676Y
Application number: CN00223183U
Authority: CN
Inventors: 王方军
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-06-02
Filing date: 2000-06-02
Publication date: 2001-03-14
Anticipated expiration: 2010-06-02

Abstract

The utility model discloses a motor with a superheating protector, which comprises a coil winding, a terminal, and a temperature control device, wherein, a leading wire of a coil is fixed by the terminal; the temperature control device is fixed on the end part of the coil winding; the temperature control device monitors the temperature of the coil of the motor. When the detected temperature of the coil achieves a control value, a power supply circuit of the motor is cut off by a control circuit, and the utility model ensures that the motor is not damaged. The utility model has the advantages of reliable operation, simple structure, and low cost.

Description

The motor of band overheat protector

The utility model relates to a kind of motor with overheat protector.

Motor is widely used in every profession and trade as a kind of equipment that converts electrical energy into mechanical energy.But in use generally need to adopt overcurrent protective device to burn out motor to avoid motor interior loop winding temperature to surpass permissible value.In real work; it is relatively poor that such protective device disconnects the time control of motor current supply circuit during to overcurrent; because in most cases motor all is that bringing onto load starts; particularly some heavy industry industries are to start under the situation of the big load of heavy duty; starting current substantially exceeds normal operating current; therefore; overcurrent protective device allows the time of overcurrent to lack normally starter motor; the overcurrent that time has been grown causing because of overload, phase shortage and stall etc. does not have the better protect effect, burns out motor easily and causes damage.

The purpose of this utility model is at the defective in the background technology, and a kind of motor with overheat protector is provided.

The utility model is that the temperature control device is set in conventional motors, and this temperature control device detects the motor coil temperature, and action of temperature control device or output signal when coil temperature surpasses a certain value make the current supply circuit of motor be disconnected the effect of playing the protection motor.Therefore, the utility model comprises coil windings, the terminals of fixed coil lead-in wire, and key is that the end of coil windings is provided with the temperature control device, the control line of described temperature control device is drawn by terminals.

Above-mentioned temperature control device can adopt bimetallic temperature controller.The class of insulation according to motor is selected bimetallic temperature controller, the control temperature that assurance produces bimetallic temperature controller and disconnects action is hanged down 15 ℃～25 ℃ than the maximum temperature that motor allows, during use bimetallic temperature controller is sealed in the control loop, when motor caused that because of reasons such as overload, phase shortage and stalls overcurrent makes motor interior loop temperature fast rise reach the control temperature of bimetallic temperature controller, bimetallic temperature controller disconnected so that control loop cuts off the current supply circuit of motor.When monophase machine is lower than 500W, can directly be connected in series with bimetallic temperature controller in the current supply circuit; When using three phase electric machine, wherein the end winding of two-phase respectively is provided with a bimetallic thermostat in motor, two bimetallic temperature controllers polyphone.

Above-mentioned temperature control device can adopt thermoelectric corner.Class of insulation design temperature control point according to motor, make it hang down 15 ℃～25 ℃ than the maximum temperature that motor allows, during use thermoelectric corner output line is inserted the signal sampling system, by control system temperature in the motor and set point are compared, the current supply circuit with motor when temperature reaches set point in detecting motor disconnects.The motor of band the type temperature control device is particularly useful for multiple electric motors is carried out the system of long-range and/or centralized monitor.

The utility model is provided with the temperature control device and detects the motor coil temperature on conventional motors coil windings end, so that when motor causes that because of reasons such as overload, phase shortage and stalls overcurrent rises motor interior loop temperature to reach temperature control point suddenly, disconnect the current supply circuit of motor, guarantee that motor is not burnt out, from the above, the motor of the same class of insulation can use the temperature control device of same temperature control point.Therefore, this reality is novel has reliable operation, the simple in structure and low advantage of cost.

Fig. 1 is the utility model structural representation;

Fig. 2 is the use circuit theory diagrams of band bimetallic temperature controller motor;

Fig. 3 is the use circuit theory diagrams with the motor in thermoelectric corner.

Among the figure: 1, motor, 2, coil windings, 3, motor housing, 4, the temperature control device, 5, rotor.6, microcomputer thermostat, 7, microrelay.

Embodiment

Embodiment 1:

Present embodiment is an example to adopt bimetallic temperature controller.As Fig. 1, motor 1 model is Y132M-4, and power is 7.5KW, and B-class insulation is 85 ℃ two of bimetallic temperature controllers with break-off signal; With mica bimetallic temperature controller is wrapped, the A that is fixed on the motor tail end with white cotton tape goes up mutually with B mutually respectively, and two thermostats are connected, and its control line is drawn and soaked into, dries with polyurethane varnish from the motor terminals.Electrical schematic diagram during use such as Fig. 2 are connected in series with two bimetallic temperature controllers in the start-up control loop, and when motor temperature reached temperature control point, bimetallic temperature controller disconnected the contactor coil dead electricity that makes in the control loop, and the current supply circuit of motor disconnects.

Embodiment 2:

Present embodiment is an example to adopt thermoelectric corner: as Fig. 1, motor 1 model is Y132M-4, and power is 7.5KW, and B-class insulation adopts two minisize thermoelectric corners; With mica the minisize thermoelectric corner is sealed, the A that two thermoelectric corners is separately fixed at the motor tail end with white cotton tape is mutually and on the B phase coil winding, and its holding wire is drawn and soaked into, dries with polyurethane varnish from the motor terminals.Electrical schematic diagram during use such as Fig. 3, the holding wire in two thermoelectric corners is inserted the input of microcomputer thermostat, control temperature and be set to 85 ℃, microcomputer thermostat output termination one microrelay 7, a pair of normally-closed contact of microrelay seals in the electric motor starting control loop.

Claims

1, a kind of motor with overheat protector comprises coil windings, and the terminals of fixed coil lead-in wire is characterized in that the end of coil windings is provided with the temperature control device, and the control line of described temperature control device is drawn by terminals.

2, the motor of band overheat protector according to claim 1 is characterized in that described temperature control device can be a bimetallic temperature controller, also thermoelectric corner.