Protective device for an electric motor corresponding process and drive device with an electric motor including said protective device
First Claim
1. A method of providing thermal protection of an electric motor, comprising the steps of:
- (a) producing interference suppression of said motor outside of said motor by passing a supply current of said motor through at least one anti-interference coil;
(b) detecting the temperature of the anti-interference coil(s); and
(c) opening an electric power supply circuit to the motor when the detected temperature reaches a predetermined value representative of a maximum temperature threshold allowed within the electric motor.
2 Assignments
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Accused Products
Abstract
A protective device suitable for being placed in the power supply circuit of an electric motor, having at least one anti-interference coil (20, 30) for the motor, and a thermal switch (10) thermally coupled to coil (20, 30) and capable of opening the power supply circuit when the coil temperature which it detects reaches a predetermined value, representative of the maximum temperature threshold allowed within the motor. Advantageously, the device also has an electric heating element, thermally coupled to the switch and capable of constituting a main current path between the two input terminals of a four-terminal network consisting of the protective device, when the power supply circuit is open, and capable of holding this circuit open in order to limit the opening-closing cycles of the switch, the invention also pertains to the corresponding process and to a drive device containing a motor and of said protective device mounted on the motor, outside of it.
19 Citations
18 Claims
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1. A method of providing thermal protection of an electric motor, comprising the steps of:
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(a) producing interference suppression of said motor outside of said motor by passing a supply current of said motor through at least one anti-interference coil; (b) detecting the temperature of the anti-interference coil(s); and (c) opening an electric power supply circuit to the motor when the detected temperature reaches a predetermined value representative of a maximum temperature threshold allowed within the electric motor. - View Dependent Claims (2)
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3. A protective device, suitable for being placed in a power supply circuit of an electric motor, comprising:
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at least one anti-interference coil coupled to the motor outside of said motor such that a supply current of said motor passes through said at least one anti-interference coil; a thermal switch thermally coupled to said at least one anti-interference coil and capable of opening the power supply circuit when a temperature of the at least one anti-interference coil reaches a predetermined value, representative of a maximum temperature threshold allowed within said electric motor. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A drive device, comprising:
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an electric motor; and a protective device mounted to and outside of the electric motor, wherein the protective device comprises; at least one anti-interference coil coupled to the motor outside of said motor such that a supply current of said motor passes through said at least one anti-interference coil; a thermal switch thermally coupled to said at least one anti-interference coil and capable of opening the power supply circuit when a temperature of the at least one anti-interference coil reaches a predetermined value, representative of a maximum temperature threshold allowed within said electric motor. - View Dependent Claims (17, 18)
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Specification