Motor starter without contactor
A device for transmitting power includes a Motor Circuit Protector (MCP) and a motorized mechanism. The MCP includes contacts that electrically connect a power supply to a low voltage motor in a closed position, and disconnect the power supply from the low voltage motor in an open position. The motorized mechanism includes a shaft, a controller, and an electric actuator. The shaft is fixed to each of the one or more contacts, and actuates the contacts to the open and closed positions. The controller is electrically connected to the power supply, and processes operating instructions and transfers power to the electric actuator according to the operating instructions. The electric actuator actuates the shaft upon receiving the power, and the low voltage motor rotates when the power supply is connected thereto.
1 . A device for transmitting power, the device comprising:
a Motor Circuit Protector (MCP) comprising:
one or more contacts that electrically connect a power supply to a motor in a closed position, and disconnect the power supply from the motor in an open position;
a voltage release element that is configured to determine a voltage of power supplied by the power supply;
a motorized mechanism, the motorized mechanism comprising:
a shaft that is fixed to each of the one or more contacts with a sliding pivot connection, a pin joint, or a bearing such that the shaft transfers linear motion to the contacts;
a controller that is electrically connected to the power supply, the controller being configured to process operating instructions and transfer the power to an electric actuator according to the operating instructions,
wherein the electric actuator is configured to actuate the shaft upon receiving the power, and the shaft is configured to actuate the one or more contacts to the open position or the closed position,
wherein the voltage release element is configured to retain the contacts in the closed position for a predetermined period of time when the voltage release element detects a voltage sag;
wherein the contacts are connected to the motor with a pivot connection such that the contacts are configured to rotate from the linear motion transferred by the shaft while the contacts remain connected to the motor, and
wherein the motor is configured to rotate when the power supply is connected thereto.
2 . The device of claim 1 , wherein the electric actuator is an electric motor.
3 . The device of claim 1 , wherein the electric actuator is a solenoid.
4 . The device of claim 1 , wherein the one or more contacts are formed of a hardened or tempered metal.
5 . The device of claim 1 , wherein the contacts are configured to be actuated to the open position when the power supply outputs an amount of power that exceeds a predetermined upper limit.
6 . The device of claim 1 , wherein, after the predetermined period of time, the contacts are configured to be actuated to the open position.
7 . The device of claim 1 , wherein the contacts are configured to remain in the closed position when the power is within a predetermined upper limit and a predetermined lower limit.
8 . The device of claim 1 , wherein the contacts are configured to actuate to the open position during a total power loss.
9 . The device of claim 1 , wherein the MCP further comprises a ground protection element and an overload protection element.
10 . The device of claim 1 , wherein the device comprises a contactor-less motor starter.
11 . A method for transmitting power, the method comprising:
supplying power from a power supply to a motorized mechanism, the motorized mechanism comprising:
a shaft fixed to one or more contacts of a Motor Circuit Protector (MCP) with a sliding pivot connection, a pin joint, or a bearing such that the shaft transfers linear motion to the contacts,
an electric actuator, and
a controller;
transferring power to the electric actuator according to operating instructions processed by the controller;
actuating the shaft using power supplied to the electric actuator, thereby actuating the one or more contacts to an open position or a closed position, the open position being a position in which the contacts electrically disconnect the power supply from a motor and the closed position being a position in which the contacts electrically connect the power supply to the motor,
rotating the motor when the power supply is electrically connected thereto,
determining a voltage of the power supplied by the power supply with a voltage release element of the MCP;
retaining the contacts in the closed position for a predetermined period of time, with the voltage release element, when the voltage release element detects a voltage sag; and
connecting the contacts to the motor with a pivot connection such that the contacts rotate from the linear motion transferred by the shaft while the contacts remain connected to the motor.
12 . The method of claim 11 , further comprising: actuating the contacts to the open position when the power supply outputs an amount of power that exceeds a predetermined upper limit.
13 . The method of claim 12 , further comprising: retaining the contacts in the closed position when the amount of power output by the power supply is within a predetermined upper limit and a predetermined lower limit.
14 . The method of claim 11 , further comprising: actuating the shaft and the contacts to the open position after the predetermined period of time.
15 . The method of claim 11 , further comprising actuating the contacts to the open position during a total power loss.
16 . The method of claim 11 , wherein the MCP is part of a contactor-less motor starter.